7Baggers

Peabody Energy Corporation
(NYSE:BTU) 

BTU stock logo

Peabody Energy Corporation engages in coal mining business in the United States, Japan, Taiwan, Australia, China, India, Vietnam, South Korea, and internationally. The company operates through Seaborne Thermal Mining, Seaborne Metallurgical Mining, Powder River Basin Mining, and Other U.S. Thermal M...

Founded: 1883
Full Time Employees: 6,600
Sector: Energy
Industry: Thermal Coal

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Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-04-02 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 
                                                                                          
      revenue
    973,300,000 1,022,300,000 1,012,100,000 890,100,000 937,000,000 1,123,100,000 1,088,000,000 1,042,000,000 983,600,000 1,235,000,000 1,078,900,000 1,268,800,000 1,364,000,000 1,626,100,000 1,342,500,000 1,321,900,000 691,400,000 679,000,000 723,400,000 651,300,000 737,200,000 671,000,000 626,700,000 846,200,000 1,117,400,000 1,106,400,000 1,149,000,000 1,250,600,000                                                           
      yoy
    3.87% -8.98% -6.98% -14.58% -4.74% -9.06% 0.84% -17.88% -27.89% -24.05% -19.64% -4.02% 97.28% 139.48% 85.58% 102.96% -6.21% 1.19% 15.43% -23.03% -34.03% -39.35% -45.46% -32.34%                                                               
      qoq
    -4.79% 1.01% 13.71% -5.01% -16.57% 3.23% 4.41% 5.94% -20.36% 14.47% -14.97% -6.98% -16.12% 21.12% 1.56% 91.19% 1.83% -6.14% 11.07% -11.65% 9.87% 7.07% -25.94% -24.27% 0.99% -3.71% -8.12%                                                            
      costs and expenses
                                                                                          
      operating costs and expenses
    864,700,000 878,400,000 896,900,000 789,400,000 770,200,000 957,000,000 845,800,000 803,900,000 814,200,000 872,800,000 803,700,000 862,000,000 846,600,000 927,800,000 838,400,000 825,600,000 699,000,000 649,400,000 611,400,000 582,600,000 638,200,000 550,900,000 556,300,000 779,500,000 823,800,000 906,200,000 858,200,000 948,400,000 1,021,000,000 1,047,900,000 946,500,000 1,057,200,000 86,700,000 1,044,900,000 934,800,000  963,700,000 1,126,400,000 1,064,800,000 996,200,000 920,200,000 1,233,300,000 1,254,000,000 1,198,800,000 1,321,600,000 1,401,200,000 1,453,300,000 1,467,600,000 1,394,800,000 1,477,400,000 1,432,100,000 1,437,200,000 1,389,400,000 1,535,900,000 1,509,000,000 1,479,800,000 1,438,600,000 1,430,300,000 1,458,800,000 1,392,800,000 1,268,100,000 1,314,300,000 1,243,300,000 1,174,700,000 1,108.7 1,157,500,000 1,261,400,000 974,500,000 1,086,700,000 1,302,000,000 1,253,000,000 1,048,500,000 1,013,667,000 139,949,000 1,265,571,000 1,077,517,000 1,091,781,000 1,077,104,000 1,003,004,000 1,053,534,000 1,022,342,000 933,977,000 987,503,000 880,274,000 919,213,000  
      depreciation, depletion and amortization
    109,500,000 99,000,000 100,000,000 93,400,000 92,100,000 95,600,000 84,700,000 82,900,000 79,800,000 82,200,000 82,300,000 80,600,000 76,300,000 90,200,000 80,700,000 73,800,000 72,900,000 77,900,000 77,100,000 68,300,000 79,500,000 72,200,000 88,300,000 106,000,000 121,600,000 141,500,000 165,400,000 172,500,000 175,900,000 169,600,000 163,900,000 169,600,000 176,100,000 194,500,000 148,300,000  119,900,000 119,900,000 117,800,000 115,900,000 111,800,000 141,600,000 136,000,000 147,100,000 147,500,000 171,800,000 163,600,000 163,100,000 157,200,000 197,500,000 186,400,000 185,700,000 170,700,000 192,700,000 172,500,000 157,300,000 144,900,000 154,400,000 113,700,000 105,300,000 108,800,000 113,600,000 116,700,000 105,100,000 105.5 99,700,000 108,000,000 102,000,000 97,300,000 114,800,000 103,800,000 93,600,000 94,002,000 37,142,000 113,054,000 108,501,000 102,862,000 114,107,000 90,664,000 91,475,000 80,964,000 83,693,000 77,159,000 79,309,000 75,953,000  
      asset retirement obligation expenses
    13,600,000 -4,800,000 13,900,000 13,800,000 13,600,000 10,200,000 12,900,000 12,900,000 12,900,000 4,200,000 15,400,000 15,500,000 15,400,000 8,600,000 13,100,000 12,700,000 15,000,000 14,300,000 15,100,000 15,900,000 -300,000 14,300,000 14,100,000 17,600,000 13,800,000 15,500,000 15,300,000 13,800,000 15,100,000 12,400,000 13,200,000 12,300,000 3,900,000 11,300,000 11,000,000  14,600,000 4,500,000 12,700,000 11,500,000 13,100,000 5,100,000 12,300,000 13,900,000 14,200,000 34,500,000 15,000,000 15,900,000 15,600,000 15,800,000 13,400,000 18,300,000 19,000,000 13,700,000 21,100,000                                
      selling and administrative expenses
    31,600,000 30,500,000 27,400,000 23,500,000 23,600,000 26,300,000 20,600,000 22,100,000 22,000,000 24,700,000 21,500,000 21,700,000 22,800,000 24,300,000 19,600,000 21,800,000 23,100,000 21,100,000 21,400,000 21,700,000 22,200,000 27,200,000 25,200,000 24,900,000 37,200,000 32,200,000 38,900,000 36,700,000 38,400,000 38,600,000 44,100,000 37,000,000 -9,200,000 33,400,000 34,400,000  37,200,000 38,800,000 32,100,000 34,200,000 48,300,000 47,600,000 37,800,000 41,600,000 49,400,000 55,500,000 52,900,000 59,200,000 59,500,000 65,000,000 55,000,000 64,000,000 65,100,000 66,400,000 68,700,000 62,700,000 71,000,000 76,800,000 71,200,000 58,600,000 61,600,000 68,600,000 54,100,000 54,100,000 55.4 59,900,000 55,300,000 46,300,000 47,200,000 63,600,000 44,200,000 43,100,000 50,883,000 17,818,000 43,698,000 42,999,000 42,631,000 57,148,000 31,488,000 40,779,000 46,526,000 54,362,000 57,009,000 40,671,000 37,760,000  
      restructuring charges
    1,100,000 300,000 4,000,000 3,500,000 1,700,000 2,300,000 1,900,000 100,000 100,000 300,000 900,000 2,000,000 100,000 100,000 1,000,000 200,000 1,600,000 1,700,000 2,100,000 2,100,000 6,800,000 8,100,000 16,500,000 6,500,000         -7,900,000 1,100,000    3,875,000 300,000 3,100,000 12,100,000 5,750,000 1,800,000 21,200,000                                           
      costs related to terminated acquisition
    3,000,000 3,700,000 54,000,000                                                                                    
      net gain on disposals
    -11,700,000 -2,400,000 -5,300,000 -14,800,000 -5,200,000 -100,000 -100,000 -7,500,000 -2,100,000 -6,500,000 -1,400,000 -5,200,000 -1,900,000 -6,500,000 -5,000,000 -12,800,000  -25,800,000   -4,800,000 -2,500,000  -8,100,000 700,000 -1,100,000  -1,500,000 1,600,000 -20,800,000  -30,600,000                                                       
      loss from equity affiliates
    5,700,000 4,200,000 2,600,000 900,000 6,700,000 1,775,000 2,100,000 1,300,000 3,700,000       -48,700,000 -44,700,000 -15,800,000 3,500,000 900,000 34,400,000 10,600,000 6,000,000 9,100,000 1,875,000 20,700,000       -61,600,000 -10,500,000 -15,700,000  -15,000,000 3,150,000 2,900,000 700,000 9,000,000 3,075,000 5,300,000 3,900,000 3,100,000 11,000,000 15,800,000 21,600,000 6,600,000 8,900,000 2,600,000 15,400,000 17,600,000 12,625,000 21,200,000 6,600,000 22,700,000 2,250,000 3,200,000 2,800,000 3,000,000 3,800,000 2,700,000 -6,400,000 1.6 46,400,000 12,000,000 6,600,000 4,100,000 -725,000 3,500,000                
      operating profit
    -44,200,000 7,800,000 -81,400,000 -38,400,000 31,900,000 40,100,000 120,100,000 233,900,000 51,200,000 250,600,000 158,800,000 260,800,000 404,500,000 582,400,000 420,500,000 449,300,000     -108,100,000 -15,800,000 -1,510,900,000 -93,500,000 -165,500,000 -36,800,000 79,500,000 184,500,000 126,800,000 130,300,000 165,300,000 239,200,000 919,100,000 202,900,000 146,000,000  198,100,000    -102,700,000 -248,500,000 -20,400,000 -975,800,000 2,200,000 -207,000,000 36,200,000 32,800,000 2,900,000 -552,200,000 112,200,000 26,400,000 88,800,000 -722,000,000 266,500,000 277,900,000 350,200,000 465,000,000 375,700,000 458,400,000 294,300,000 314,400,000 444,700,000 324,400,000 242.2 189,400,000 220,300,000 211,900,000 218,700,000 386,200,000 490,200,000 343,800,000 172,669,000 135,677,000 89,114,000 188,602,000 155,331,000 143,142,000 173,004,000 175,695,000 171,241,000 157,386,000 150,885,000 129,309,000 80,803,000  
      yoy
    -238.56% -80.55% -167.78% -116.42% -37.70% -84.00% -24.37% -10.31% -87.34% -56.97% -62.24% -41.95%         -34.68% -57.07% -2000.50% -150.68% -230.52% -128.24% -51.91% -22.87% -86.20% -35.78% 13.22%  363.96%    -292.89%    -4768.18% 20.05% -156.35% -3075.00% -24.14% -62.51% -67.74% 24.24% -96.73% -23.52% -57.90% -90.50% -74.64% -255.27% -29.07% -39.38% 18.99% 47.90% -15.52% 41.31% 121511047.81% 66.00% 101.86% 53.09% -100.00% -50.96% -55.06% -38.37% 26.66% 184.65% 450.08% 82.29% 11.16% -5.22% -48.49% 7.35% -9.29% -9.05% 14.66% 35.87% 111.92%      
      qoq
    -666.67% -109.58% 111.98% -220.38% -20.45% -66.61% -48.65% 356.84% -79.57% 57.81% -39.11% -35.53% -30.55% 38.50% -6.41%      584.18% -98.95% 1515.94% -43.50% 349.73% -146.29% -56.91% 45.50% -2.69% -21.17% -30.89% -73.97% 352.98% 38.97%       -58.67% 1118.14% -97.91% -44454.55% -101.06% -671.82% 10.37% 1031.03% -100.53% -592.16% 325.00% -70.27% -112.30% -370.92% -4.10% -20.65% -24.69% 23.77% -18.04% 55.76% -6.39% -29.30% 37.08% 133938793.48% -100.00% -14.03% 3.96% -3.11% -43.37% -21.22% 42.58% 99.11% 27.26% 52.25% -52.75% 21.42% 8.52% -17.26% -1.53% 2.60% 8.80% 4.31% 16.69% 60.03%   
      operating margin %
    -4.54% 0.76% -8.04% -4.31% 3.40% 3.57% 11.04% 22.45% 5.21% 20.29% 14.72% 20.55% 29.66% 35.82% 31.32% 33.99% 0% 0% 0% 0% -14.66% -2.35% -241.09% -11.05% -14.81% -3.33% 6.92% 14.75% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% NaN% Infinity% NaN% NaN% NaN% -Infinity% -Infinity% -Infinity% -Infinity% Infinity% -Infinity% Infinity% Infinity% Infinity% -Infinity% Infinity% Infinity% Infinity% -Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity%  
      interest expense, net of capitalized interest
    10,700,000 11,300,000 10,000,000 11,100,000 11,500,000 11,800,000 9,700,000 10,700,000                                                                               
      interest income
    -13,100,000 -12,300,000 -13,900,000 -13,800,000 -15,400,000 -17,300,000 -17,700,000 -16,800,000 -19,200,000 -20,300,000 -20,300,000 -23,100,000 -13,100,000 -12,100,000 -4,900,000 -900,000 -500,000 -1,400,000 -1,300,000 -1,500,000 -2,300,000 -1,600,000 -2,400,000 -3,100,000 -4,500,000 -7,000,000 -7,200,000 -8,300,000 -9,300,000 -10,100,000 -7,000,000 -7,200,000 -1,600,000 -2,000,000 -1,500,000  -2,700,000 -1,700,000 -1,300,000 -1,300,000 -1,400,000 -1,100,000 -1,400,000 -2,700,000 -2,500,000 -3,700,000 -3,700,000 -4,400,000 -3,600,000 -4,500,000 -4,200,000 -1,100,000 -5,900,000 -4,800,000 -5,100,000 -6,500,000 -8,100,000 -7,200,000 -4,100,000 -3,500,000 -4,100,000 -4,200,000 -2,800,000 -1,600,000 -1 -1,900,000 -2,200,000 -1,200,000 -2,800,000 -3,000,000 -3,500,000 -2,500,000 -1,112,000 6,890,000 -4,955,000 -3,639,000 -5,390,000 -6,700,000 -1,886,000 -1,534,000 -2,606,000 -4,240,000 -3,218,000 -1,810,000 -1,373,000  
      net periodic benefit credit, excluding service cost
    -400,000 -7,400,000 -7,500,000 -7,400,000 -7,400,000 -10,200,000 -10,100,000 -10,200,000 -10,100,000 -12,200,000 -10,000,000 -9,700,000 -9,700,000 -12,300,000 -12,200,000 -12,300,000 -12,200,000                                                                      
      income from continuing operations before income taxes
    -41,400,000 21,600,000 -70,000,000 -28,300,000 43,200,000 61,900,000 138,200,000 250,200,000 65,800,000 269,100,000 175,300,000 278,300,000 402,100,000 581,700,000 395,100,000 422,600,000     -115,100,000 -64,900,000 -1,545,500,000 -126,300,000 -270,200,000 -70,100,000 45,900,000 152,100,000 220,600,000 97,700,000 127,400,000 218,400,000 1,148,900,000 149,600,000 106,100,000  126,500,000         -308,500,000 -74,600,000   -649,800,000 5,400,000 -83,300,000 -6,600,000 -814,500,000 172,200,000 177,500,000 256,300,000 392,900,000 320,600,000 412,800,000 247,400,000 266,600,000 385,300,000 268,100,000 193.2 141,700,000 170,200,000 164,900,000 170,400,000                  
      income tax benefit
    -16,000,000 10,000,000 -3,400,000 -2,700,000 4,900,000 23,600,000 25,700,000 39,400,000 20,100,000 70,100,000 46,500,000 74,200,000 118,000,000 -59,800,000 10,700,000 11,300,000 -1,000,000 -3,700,000 -4,800,000 -1,800,000 5,300,000 -100,000 -200,000 3,000,000 20,000,000 4,200,000 3,000,000 18,800,000 -12,900,000 13,800,000 7,400,000 10,100,000 -52,800,000 -84,100,000 4,700,000  -4,500,000 24,700,000 -12,900,000 -30,000,000 -65,800,000 -93,200,000 6,900,000 -93,100,000 3,000,000 170,300,000 79,400,000 4,000,000 -52,500,000 -248,700,000 -18,600,000 -184,700,000 3,700,000 176,800,000 49,300,000 -37,800,000 74,000,000 138,500,000 37,100,000 119,800,000 67,800,000 50,900,000 147,700,000 53,400,000 56.1 28,200,000 57,000,000 77,200,000 29,900,000 37,900,000 60,200,000 43,600,000 44,118,000 -115,848,000 5,967,000 19,155,000 12,614,000 -92,420,000 2,657,000 -3,318,000 11,566,000 -28,340,000 14,714,000 10,162,000 4,424,000  
      income from continuing operations, net of income taxes
    -25,400,000 11,600,000 -66,600,000 -25,600,000 38,300,000 38,300,000 112,500,000 210,800,000 45,700,000 199,000,000 128,800,000 204,100,000 284,100,000 641,500,000 384,400,000 411,300,000     -120,400,000 -64,800,000 -1,545,300,000 -129,300,000 -290,200,000 -74,300,000 42,900,000 133,300,000 233,500,000 83,900,000 120,000,000 208,300,000 1,201,700,000 233,700,000 101,400,000  131,000,000         -478,800,000 -154,000,000 -72,000,000  -401,100,000 24,000,000 101,400,000 -10,300,000 -991,300,000 122,900,000 215,300,000 182,300,000 254,400,000 283,500,000 293,000,000 179,600,000 215,700,000 237,600,000 214,700,000 137.1 113,500,000 113,200,000 87,700,000 140,500,000                  
      loss from discontinued operations, net of income taxes
    -200,000 800,000 -300,000 -400,000 -300,000   -1,600,000 -700,000   -1,300,000 -1,300,000   -700,000 -800,000  -2,300,000 -2,000,000 -1,700,000 -2,300,000 -2,300,000 -2,200,000 -2,650,000 -3,800,000 -3,400,000 -3,400,000 -2,250,000 -4,100,000 -3,600,000 -1,300,000 24,700,000 -3,700,000 -2,700,000  -4,100,000 -11,125,000 -38,100,000 -3,000,000 -3,400,000         -16,625,000 -43,100,000 -14,300,000 -9,100,000 -23,175,000 -81,300,000 -7,500,000 -4,000,000 -925,000 -2,000,000 -800,000 -900,000                          
      net income
    -25,600,000 12,400,000 -66,900,000 -26,000,000 38,000,000 37,800,000 111,500,000 209,200,000 45,000,000 198,700,000 131,300,000 202,800,000 282,800,000 645,500,000 383,600,000 410,600,000 -120,600,000 -35,300,000 -25,300,000 -79,700,000 -127,600,000 -67,100,000 -1,547,600,000 -131,500,000 -276,400,000 -78,100,000 39,500,000 129,900,000 260,600,000 79,800,000 116,400,000 207,000,000 1,226,400,000 230,000,000 98,700,000  126,900,000 -199,300,000 -133,700,000 -233,800,000 -165,100,000 -470,200,000 -301,900,000 -1,043,500,000 -173,300,000 -513,000,000 -149,000,000 -71,200,000 -44,100,000 -561,200,000 -19,100,000 87,100,000 -19,400,000 -1,002,800,000 41,600,000 207,800,000 178,300,000 193,900,000 281,500,000 292,200,000 178,700,000 215,000,000 236,300,000 214,200,000 136.7 95,000,000 110,800,000 82,000,000 175,200,000 293,300,000 369,600,000 233,400,000 57,165,000 35,815,000 32,272,000 107,692,000 88,506,000 175,033,000 142,008,000 153,434,000 130,222,000 162,169,000 113,340,000 95,254,000 51,890,000  
      yoy
    -167.37% -67.20% -160.00% -112.43% -15.56% -80.98% -15.08% 3.16% -84.09% -69.22% -65.77% -50.61% -334.49% -1928.61% -1616.21% -615.18% -5.49% -47.39% -98.37% -39.39% -53.84% -14.08% -4017.97% -201.23% -206.06% -197.87% -66.07% -37.25% -78.75% -65.30% 17.93%  866.43% -215.40% -173.82%  -176.86% -57.61% -55.71% -77.59% -4.73% -8.34% 102.62% 1365.59% 292.97% -8.59% 680.10% -181.75% 127.32% -44.04% -145.91% -58.08% -110.88% -617.17% -85.22% -28.88% -0.22% -9.81% 19.13% 36.41% 130724113.61% 126.32% 113.27% 161.22% -100.00% -67.61% -70.02% -64.87% 206.48% 718.93% 1045.27% 116.73% -35.41% -79.54% -77.27% -29.81% -32.03% 7.93% 25.29% 61.08% 150.96%      
      qoq
    -306.45% -118.54% 157.31% -168.42% 0.53% -66.10% -46.70% 364.89% -77.35% 51.33% -35.26% -28.29% -56.19% 68.27% -6.58% -440.46% 241.64% 39.53% -68.26% -37.54% 90.16% -95.66% 1076.88% -52.42% 253.91% -297.72% -69.59% -50.15% 226.57% -31.44% -43.77% -83.12% 433.22% 133.03%   -163.67% 49.07% -42.81% 41.61% -64.89% 55.75% -71.07% 502.14% -66.22% 244.30% 109.27% 61.45% -92.14% 2838.22% -121.93% -548.97% -98.07% -2510.58% -79.98% 16.55% -8.05% -31.12% -3.66% 63.51% -16.88% -9.01% 10.32% 156693389.39% -100.00% -14.26% 35.12% -53.20% -40.27% -20.64% 58.35% 308.29% 59.61% 10.98% -70.03% 21.68% -49.43% 23.26% -7.45% 17.82% -19.70% 43.08% 18.99% 83.57%   
      net income margin %
    -2.63% 1.21% -6.61% -2.92% 4.06% 3.37% 10.25% 20.08% 4.58% 16.09% 12.17% 15.98% 20.73% 39.70% 28.57% 31.06% -17.44% -5.20% -3.50% -12.24% -17.31% -10.00% -246.94% -15.54% -24.74% -7.06% 3.44% 10.39% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% NaN% Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% Infinity% -Infinity% -Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity%  
      less: net income attributable to noncontrolling interests
    6,800,000 2,000,000 3,200,000 1,600,000 3,600,000 7,200,000 10,200,000 9,800,000 5,400,000 6,700,000 11,400,000 23,600,000 14,300,000 13,500,000 8,500,000 1,100,000 -1,100,000 8,900,000 3,300,000 400,000 1,600,000 100,000 -3,400,000 -1,800,000 13,400,000 4,700,000 2,400,000 5,700,000 8,000,000 8,300,000 2,700,000 -2,100,000 11,700,000 5,100,000 3,800,000  4,800,000 4,400,000 1,800,000 1,700,000  -800,000 2,800,000 1,800,000 3,300,000 1,600,000 1,600,000 2,100,000 4,400,000 4,500,000 7,000,000 -3,200,000 4,000,000 3,200,000 -1,300,000 3,100,000 5,600,000 -28,400,000 7,400,000 7,400,000 2,200,000 5,000,000 12,200,000 8,000,000 2,800,000 4,000,000 2,800,000 5,200,000                  
      net income attributable to common stockholders
    -32,400,000 10,400,000 -70,100,000 -27,600,000 34,400,000 30,600,000 101,300,000 199,400,000 39,600,000 192,000,000 119,900,000 179,200,000 268,500,000 632,000,000 375,100,000 409,500,000     -129,200,000 -67,200,000 -1,544,200,000 -129,700,000 -289,800,000 -82,800,000 37,100,000 124,200,000 252,600,000 71,500,000 113,700,000 106,600,000 1,035,200,000 201,400,000   122,100,000         -514,600,000 -150,600,000 -73,300,000  -565,700,000 -26,100,000 90,300,000 -23,400,000 -1,006,000,000 42,900,000 204,700,000 172,700,000 222,300,000 274,100,000 284,800,000 176,500,000 210,000,000 224,100,000 206,200,000 133.7 92,200,000 106,800,000 79,200,000 170,000,000                  
      income from continuing operations:
                                                                                          
      basic income per share
    -0.26 0.08 -0.57 -0.22 0.29 0.27 0.82 1.59 0.32 1.46 0.88 1.27 1.87 4.4 2.61 2.85     -1.23 -0.66 -15.76 -1.31 -2.91 -0.77 0.38 1.18 1.92 0.64 0.94 0.84 -6.728 1.51   6.82         -0.26 -0.58 -0.28                                       
      diluted income per share
    -0.26 0.08 -0.57 -0.22 0.27 0.26 0.74 1.43 0.3 1.32 0.8 1.16 1.69 3.96 2.34 2.55     -1.23 -0.66 -15.76 -1.31 -2.9 -0.77 0.37 1.15 1.88 0.63 0.93 0.83 -6.728 1.49   6.8         -0.26 -0.58 -0.28                                       
      net income attributable to common stockholders:
                                                                                          
      other operating loss:
                                                                                          
      provision for narm loss
            1,800,000                                                                              
      shoal creek insurance recovery
           -109,500,000                                                                               
      transaction costs related to business combinations
       18,800,000 2,400,000                                                                                  
      asset impairment
                2,000,000 9,500,000 1,700,000      69,300,000  1,418,100,000  250,200,000 20,000,000       4,300,000    30,500,000 230,700,000   17,200,000 377,000,000  900,800,000      5,375,000  21,500,000                                   
      provision for narm and shoal creek losses
           1,900,000                                                                               
      net loss on early debt extinguishment
               2,000,000 6,800,000 23,400,000 8,700,000 2,300,000 23,500,000                                                                      
      income from discontinued operations, net of income taxes
         -500,000 -1,000,000   -300,000 2,500,000   4,000,000 -800,000   24,300,000                        27,700,000 -157,500,000 -36,300,000 -8,900,000 -34,200,000 5,000,000 800,000 200,000             -700,000 -1,300,000 -500,000 -0.4 -18,500,000 -2,400,000 -5,700,000 34,700,000                  
      interest expense
            14,700,000 14,300,000 13,800,000 13,300,000 18,400,000 29,500,000 33,800,000 37,600,000 39,400,000 45,500,000 45,400,000 52,400,000 37,500,000 34,900,000 34,300,000 33,100,000 36,800,000 35,400,000 36,000,000 35,800,000 36,500,000 38,200,000 38,300,000 36,300,000 -124,000,000 42,400,000 41,400,000  32,900,000 54,900,000 58,500,000 59,000,000 126,200,000 121,400,000 118,500,000 118,900,000 106,600,000 105,200,000 114,500,000 105,200,000 103,300,000 102,100,000 111,000,000 110,800,000 101,300,000 97,300,000 99,400,000 106,900,000 102,000,000 79,300,000 59,200,000 49,100,000 51,000,000 52,000,000 62,200,000 57,900,000 50 49,600,000 52,300,000 48,200,000 51,100,000 55,200,000 54,100,000 57,600,000 59,238,000 58,550,000 58,872,000 59,036,000 58,778,000 64,320,000 26,392,000 25,338,000 27,400,000 26,851,000 25,327,000 25,205,000 25,556,000  
      provision for narm and shoal creek loss
             9,250,000 3,300,000 33,700,000                                                                           
      income from equity affiliates
             2,800,000 -5,600,000 -2,300,000 -1,800,000 -30,225,000 -27,500,000            -9,700,000 -3,500,000 -3,700,000 -17,200,000 -25,200,000 -22,000,000                                        -3,700,000 -2,655,000 -5,018,000 -2,959,000 -4,324,000 -2,160,000 -4,783,000 -5,200,000 -6,680,000 -7,252,000 -7,385,250 -8,863,000 -11,487,000 -9,191,000  
      other operating income:
                                                                                          
      net loss on disposals
                    -4,900,000  -3,000,000 600,000   200,000    -200,000    1,600,000                                                        
      operating income
                    -70,600,000 -43,800,000 -4,200,000 -40,800,000                  -44,900,000 -21,600,000 -107,700,000                                               
      loss from continuing operations before income taxes
                    -120,800,000 -63,300,000 -27,800,000 -79,500,000                  -149,200,000 -108,500,000 -260,800,000 -227,500,000 -349,800,000 -137,500,000 -1,100,300,000 -161,400,000   -68,000,000 -96,800,000                                      
      loss from continuing operations, net of income taxes
                    -119,800,000 -59,600,000 -23,000,000 -77,700,000                  -122,025,000 -95,600,000 -230,800,000 -161,700,000 -329,000,000 -144,400,000 -1,007,200,000 -164,400,000    -44,300,000                                      
      net loss attributable to common stockholders
                    -119,500,000 -44,200,000 -28,600,000 -80,100,000               -20,200,000   -134,025,000 -135,500,000 -235,500,000 -165,100,000 -381,650,000 -304,700,000 -1,045,300,000 -176,600,000    -48,500,000                                      
      loss from continuing operations:
                                                                                          
      basic loss per share
                    -0.87 -0.6 -0.26 -0.79               -0.18   -10.42 -5.32 -12.71 -8.85 -27.29 -8.08 -3.71 -0.62    -0.18                                      
      diluted loss per share
                    -0.87 -0.6 -0.26 -0.79               -0.18   -10.42 -5.32 -12.71 -8.85 -27.29 -8.08 -3.71 -0.62    -0.18                                      
      net loss attributable to common stockholders:
                                                                                          
      transaction costs related to joint ventures
                        5,775,000 6,000,000 12,900,000 4,200,000                                                               
      net gain on early debt extinguishment
                     -16,000,000 -11,800,000                                                                    
      net periodic benefit (credit) costs, excluding service cost
                     -8,600,000 -8,700,000 -8,700,000                                                                   
      net mark-to-market adjustment on actuarially determined liabilities
                        -18,100,000 13,000,000                                                                 
      gain on early debt extinguishment
                       -3,500,000                                                                   
      provision for north goonyella equipment loss
                            58,500,000   24,700,000 17,100,000 49,300,000                                                         
      north goonyella insurance recovery
                               -125,000,000                                                           
      net periodic benefit costs, excluding service cost
                        2,075,000 2,800,000 2,700,000 2,800,000 4,800,000 4,900,000 4,800,000 4,900,000 4,500,000 4,500,000 4,600,000 4,500,000                                                       
      transaction costs related to business combinations and joint ventures
                            11,800,000 8,200,000 1,600,000                                                            
      loss on early debt extinguishment
                                  2,000,000   12,900,000          8,300,000 59,500,000                                          
      reorganization items
                                   -12,800,000 31,275,000    41,400,000 33,900,000 29,700,000 95,400,000                                               
      less: series a convertible preferred stock dividends
                                   102,500,000  23,500,000 115,100,000                                                    
      sales
                                900,225,000 1,194,500,000 1,137,300,000 1,269,100,000 789,900,000 1,264,200,000 1,059,600,000  1,064,100,000 1,256,000,000 1,076,800,000 905,300,000 879,800,000 1,215,400,000 1,277,400,000 1,226,800,000 1,418,700,000 1,513,400,000 1,550,500,000 1,598,600,000 1,470,200,000 1,592,800,000 1,621,400,000 1,588,600,000 1,577,200,000 1,759,700,000 1,797,200,000 1,716,800,000 1,803,000,000 1,939,500,000 1,737,300,000 1,800,800,000 1,613,700,000 1,713,000,000 1,663,400,000 1,569,800,000 1,385.1 1,444,600,000 1,537,000,000 1,209,300,000 1,287,000,000 1,662,700,000 1,761,800,000 1,422,100,000 1,189,737,000 342,003,000 1,431,855,000 1,276,035,000 1,314,815,000 1,339,087,000 1,223,274,000 1,293,658,000 1,288,906,000 1,201,703,000 1,191,282,000 1,089,817,000 1,067,652,000  
      other revenues
                                145,950,000 218,100,000 172,100,000 193,600,000 188,200,000 213,000,000 198,700,000  262,100,000 184,800,000 130,300,000 134,900,000 147,400,000 97,700,000 141,500,000 112,500,000 119,200,000 171,100,000 172,400,000 159,400,000 156,600,000 150,000,000 176,200,000 136,700,000 170,800,000 257,200,000 261,600,000 281,400,000 235,600,000 246,100,000 298,600,000 207,200,000 131,200,000 105,300,000 201,300,000 91,600,000 130.5 109,600,000 130,000,000 131,600,000 173,100,000 218,100,000 143,900,000 108,800,000 86,214,000 51,870,000 61,761,000 46,017,000 50,356,000 24,042,000 41,714,000 22,730,000 22,904,000 32,974,000 32,228,000 18,969,000 14,959,000  
      total revenues
                                1,046,175,000 1,412,600,000 1,309,400,000 1,462,700,000 978,100,000 1,477,200,000 1,258,300,000  1,326,200,000 1,440,800,000 1,207,100,000 1,040,200,000 1,027,200,000 1,313,100,000 1,418,900,000 1,339,300,000 1,537,900,000 1,684,500,000 1,722,900,000 1,758,000,000 1,626,800,000 1,742,800,000 1,797,600,000 1,725,300,000 1,748,000,000 2,016,900,000 2,058,800,000 1,998,200,000 2,038,600,000 2,185,600,000 2,035,900,000 2,008,000,000 1,744,900,000 1,818,300,000 1,864,700,000 1,661,400,000 1,515.6 1,554,200,000 1,667,000,000 1,340,900,000 1,460,100,000 1,880,800,000 1,905,700,000 1,530,900,000 1,275,951,000 393,873,000 1,493,616,000 1,322,052,000 1,365,171,000 973,296,500 1,264,988,000 1,316,388,000 1,311,810,000 852,444,000 1,223,510,000 1,108,786,000 1,082,611,000  
      acquisition costs related to shoal creek
                                625,000 2,500,000                                                         
      dividends declared per share
                                0.13 0.125 0.115 0.115            0.003 0.003 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 -0.075 0.095 0.075 0.075  
      net gain on disposal of assets
                                    -4,350,000 -400,000 -500,000  -22,800,000 -5,800,000 -1,900,000 -13,700,000 -1,800,000 -24,800,000 -7,900,000 -12,200,000 -100,000                                -36,649,000    -9,226,000   -16,452,000 -31,122,000  
      net gain on disposal or exchange of assets
                                                 -15,500,000 -13,900,000 -2,200,000 -9,800,000 -2,700,000 -4,100,000 -43,200,000 -2,600,000 -9,500,000 -200,000 -3,400,000 -4,000,000 -45,500,000 -1,700,000 -25,700,000 -4,000,000 -14,600,000 -6,700,000 -1,400,000 -7.3 -7,000,000 -2,800,000 -10,100,000 -3,300,000 -5,100,000 -4,800,000 -3,600,000 -59,415,000 70,291,000 -23,610,000 -98,716,000  -23,577,250 -35,040,000 -50,043,000  -23,787,750 -47,577,000    
      basic earnings per share
                                                     -1.52 0.06 0.39 -0.05 -3.69 0.46 0.78 0.64 1.04 1.02 1.05 0.66 0.78 0.84 0.77 0.5 0.42 0.41 0.32 0.51                  
      diluted earnings per share
                                                     -1.52 0.06 0.39 -0.05 -3.69 0.46 0.78 0.64 1.04 1.01 1.05 0.65 0.77 0.83 0.76 0.5 0.41 0.41 0.31 0.5                  
      income from continuing operations
                                                                         295,600,000 377,100,000 242,600,000 69,546,000         162,169,000 113,340,000 95,254,000 51,890,000  
      asset retirement obligation expense
                                                           17,300,000 15,200,000 9,200,000 15,000,000 15,800,000 13,100,000 18,200,000 9,900,000 10,900,000 9.5 8,300,000 12,800,000 9,700,000 9,400,000 16,400,000 15,800,000 9,200,000 6,800,000 -1,986,000 8,748,000 7,473,000 11,375,000 14,201,000 7,068,000 11,628,000 7,215,000 12,150,000 7,394,000 7,162,000 9,195,000  
      income from continuing operations before income taxes and minority interests
                                                                         334,000,000 439,600,000 288,700,000 114,543,000              
      minority interests
                                                                         500,000 2,300,000 2,500,000 879,000 -6,455,000 -3,042,000 6,358,000 823,000 1,513,000 3,833,000 1,775,000 4,659,000 946,000 722,000 498,000 306,000  
      loss from discontinued operations, net of tax
                                                                         -7,250,000 -7,500,000                
      loss from discontinued operations
                                                                         -0.025 -0.03                
      weighted-average shares outstanding — basic
                                                                          270,192,203 269,991,967 269,204,883 264,068,180    263,419,344    261,519,424 131,216,197 130,815,073 130,346,759  
      weighted-average shares outstanding — diluted
                                                                          272,617,085 272,664,395 272,142,973 269,166,290    269,166,005    268,013,476 134,260,988 133,810,208 133,400,653  
      income from discontinued operations, net of tax
                                                                           -9,200,000 -12,381,000              
      income from discontinued operations
                                                                           -0.04 -0.05              
      income before income taxes and minority interests
                                                                             67,586,250 35,197,000 133,205,000 101,943,000 111,709,000 148,498,000 151,891,000 146,447,000 72,827,500 128,776,000 105,914,000 56,620,000  
      earnings per share
                                                                                          
      basic
                                                                             0.218 0.12 0.41 0.34 0.403 0.54 0.58 0.49      
      diluted
                                                                             0.213 0.12 0.4 0.33 0.395 0.53 0.57 0.48      
      weighted-average shares outstanding
                                                                                          
      basic
                                                                              263,871,330 263,479,042 263,031,869  263,444,254 263,958,590 263,491,072      
      effect of dilutive securities
                                                                             1,293,149.25 5,069,600 5,233,267 5,091,593          
      diluted
                                                                             67,159,104.75 268,940,930 268,712,309 268,123,462          
      earnings per share:
                                                                                          
      basic
                                                                             0.218 0.12 0.41 0.34 0.403 0.54 0.58 0.49      
      diluted
                                                                             0.213 0.12 0.4 0.33 0.395 0.53 0.57 0.48      
      weighted-average shares outstanding:
                                                                                          
      basic
                                                                              263,871,330 263,479,042 263,031,869  263,444,254 263,958,590 263,491,072      
      diluted
                                                                                  268,822,681 269,756,666 269,358,728      
      early debt extinguishment gains
                                                                                          
      loss from discontinued operations, net of income tax benefit of 1 and 1,893, respectively
                                                                                          
      loss from discontinued operations, net of income tax benefit of 1,177 and 1,892, respectively
                                                                                          
      loss from discontinued operations, net of income tax benefit of 715
                                                                                          
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 
                                                                                          
        assets
                                                                                          
        current assets
                                                                                          
        cash and cash equivalents
      492,500,000 575,300,000 603,300,000 585,900,000 696,500,000 700,400,000 772,900,000 621,700,000 855,700,000 969,300,000 988,500,000 1,080,500,000 892,200,000 1,307,300,000 1,354,500,000 1,120,700,000 823,300,000 587,000,000 548,300,000 580,200,000 709,200,000 814,600,000 848,500,000 682,500,000 732,200,000 759,100,000 853,000,000 798,100,000 981,900,000 1,371,000,000 1,451,700,000 1,416,600,000 1,012,100,000 925,000,000 1,095,700,000 1,068,100,000 872,300,000 1,167,800,000 1,274,300,000 745,600,000 261,300,000 334,300,000 487,100,000 637,100,000 298,000,000 466,500,000 498,400,000 508,100,000 444,000,000 551,300,000 517,900,000 629,500,000 558,800,000 648,000,000 489,200,000 952,400,000 799,100,000 1,401,600,000 1,176,900,000 1,273,200,000 1,295,200,000 1,367,500,000 1,157,000,000 1,025,400,000 988,800,000 790,800,000 446,000,000 526,700,000 449,700,000 104,000,000 74,800,000 82,547,000 45,279,000 216,314,000 82,275,000 295,327,000 326,511,000 298,883 318,736,000 350,160,000 503,278,000 478,741,000 459,367,000 381,225,000 
        accounts receivable
      309,500,000 314,900,000 307,200,000 322,700,000 277,700,000 359,300,000 304,200,000 511,600,000 343,100,000 389,700,000 348,400,000 325,500,000 394,700,000 465,500,000 426,400,000 530,400,000 357,400,000 276,000,000 250,700,000 167,800,000 244,800,000 192,900,000 191,400,000 265,200,000 329,500,000 293,400,000 395,700,000 554,600,000 450,400,000 444,900,000 503,000,000 524,000,000 552,100,000 431,000,000 396,500,000 312,100,000 473,000,000 351,900,000 350,600,000 263,700,000 228,800,000 370,000,000 301,700,000 431,400,000 563,100,000 490,000,000 447,100,000 454,400,000 557,900,000 701,700,000 732,200,000 661,800,000 737,800,000 682,200,000 816,200,000 748,100,000 922,500,000 591,400,000 644,800,000 476,400,000  583,300,000 393,700,000 305,600,000 303,000,000 339,800,000 319,100,000 290,600,000 383,600,000 412,900,000 296,000,000 278,959,000 257,950,000 277,442,000 259,625,000 278,062,000  1,153 261,997,000 238,867,000     
        inventories
      405,500,000 383,200,000 405,200,000 417,500,000 418,000,000 393,400,000 444,300,000 422,100,000 404,300,000 351,800,000 352,000,000 312,900,000 331,500,000 296,100,000 277,400,000 252,900,000 269,100,000 224,500,000 232,500,000 241,400,000 261,600,000 319,700,000 301,600,000 269,200,000 331,500,000 294,800,000 322,100,000 268,500,000 280,200,000 277,100,000 290,500,000 265,500,000 291,300,000 307,700,000 313,500,000 250,800,000 203,700,000 259,600,000 303,700,000 315,800,000 307,800,000 348,100,000 395,600,000 369,500,000 406,500,000 490,900,000 548,400,000 549,400,000 506,700,000 563,200,000 581,600,000 566,000,000 548,400,000 554,900,000 581,700,000 514,900,000 446,300,000 351,900,000 374,000,000 362,800,000 332,900,000 396,300,000 363,400,000 343,200,000 325,100,000 357,200,000 447,500,000 327,000,000 277,700,000 275,100,000 296,300,000 251,316,000 268,862,000 267,194,000 285,670,000 217,563,000 215,384,000  167,116,000 175,049,000 389,771,000 368,850,000 363,561,000 345,562,000 
        other current assets
      303,800,000 285,400,000 273,500,000 301,200,000 280,200,000 327,600,000 286,600,000 296,800,000 298,400,000 308,900,000 244,100,000 244,300,000 260,100,000 303,600,000 305,800,000 346,000,000 331,800,000 223,800,000 225,400,000 239,200,000 204,700,000 209,200,000 241,200,000 202,300,000 220,700,000 218,400,000 229,000,000 239,500,000 243,100,000 213,900,000 223,200,000 251,100,000 291,800,000 268,600,000 171,800,000 493,900,000 486,600,000 368,900,000 335,400,000 467,400,000 503,100,000 382,400,000 387,100,000 225,200,000 305,800,000 324,400,000 265,900,000 283,900,000 381,600,000 359,100,000 321,500,000 503,300,000 621,700,000 697,600,000 589,700,000 746,700,000 766,100,000 503,200,000 627,000,000 552,900,000 459,000,000 331,600,000 161,000,000 266,300,000 255,300,000 228,400,000 197,000,000 235,100,000 195,800,000 210,100,000 456,600,000 304,265,000 215,928,000 208,158,000 140,070,000 120,660,000 116,863,000 24,761 78,682,000 75,167,000 54,431,000 84,430,000 57,991,000 57,653,000 
        total current assets
      1,511,300,000 1,558,800,000 1,589,200,000 1,627,300,000 1,672,400,000 1,780,700,000 1,808,000,000 1,852,200,000 1,901,500,000 2,019,700,000 1,933,000,000 1,963,200,000 1,878,500,000 2,372,500,000 2,364,100,000 2,250,000,000 1,806,300,000 1,311,300,000 1,270,500,000 1,272,100,000 1,420,300,000 1,536,400,000 1,582,700,000 1,419,200,000 1,613,900,000 1,565,700,000 1,799,800,000 1,860,700,000 1,955,600,000 2,306,900,000 2,468,400,000 2,577,500,000 2,190,000,000 1,942,600,000 1,978,100,000 3,206,200,000 2,090,600,000 2,245,800,000 2,381,900,000 1,952,100,000 1,378,000,000 1,553,600,000 1,694,000,000 1,808,900,000 1,711,000,000 1,931,400,000 1,877,800,000 1,910,200,000 1,992,700,000 2,287,800,000 2,249,200,000 2,452,100,000 2,575,500,000 2,654,700,000 2,574,500,000 3,029,700,000 3,005,900,000 3,005,000,000 3,110,400,000 3,046,200,000 2,958,200,000 2,915,400,000 2,330,200,000 2,248,600,000 2,189,000,000 2,089,100,000 1,857,900,000 1,949,700,000 1,971,300,000 1,818,600,000 2,614,800,000 1,571,825,000 1,927,293,000 1,782,092,000 1,144,941,000 1,180,597,000  324,797 1,005,347,000 925,908,000  1,269,163,000 1,153,222,000 1,062,012,000 
        property, plant, equipment and mine development
      3,129,900,000 3,153,300,000 3,075,500,000 3,056,300,000 3,058,000,000 3,081,500,000 3,013,500,000 3,003,100,000 2,830,200,000 2,844,100,000 2,805,500,000 2,819,500,000 2,847,900,000 2,865,000,000 2,817,600,000 2,856,600,000 2,903,300,000 2,952,000,000 3,008,300,000 3,025,400,000 3,051,100,000 3,152,300,000 3,178,400,000 4,607,800,000 4,679,100,000 4,899,200,000 4,974,800,000 5,069,500,000 5,207,000,000 4,851,900,000 4,945,700,000 5,008,000,000 5,111,900,000 5,082,600,000 5,214,200,000 8,653,900,000 8,776,700,000 9,215,500,000 9,061,900,000 9,162,800,000 9,258,500,000 9,475,400,000 9,494,000,000 10,451,800,000 10,577,300,000 10,651,100,000 10,700,500,000 10,855,400,000 11,082,500,000 11,448,300,000 11,492,000,000 11,597,700,000 11,801,700,000 12,511,100,000 12,435,600,000 11,969,100,000 11,362,700,000 7,808,100,000 7,584,000,000 7,421,500,000 7,426,100,000 7,219,100,000 7,246,400,000 7,245,800,000 7,261,500,000 7,228,200,000 7,313,300,000 7,308,700,000 7,315,200,000 7,387,400,000 7,342,500,000 7,333,514,000 7,332,400,000 7,832,337,000 7,763,941,000 7,663,021,000 7,551,517,000    5,177,708,000    
        operating lease right-of-use assets
      128,900,000 121,200,000 99,600,000 74,600,000 84,100,000 119,300,000 121,100,000 114,100,000 78,600,000 61,900,000 36,000,000 27,200,000 22,700,000 26,900,000 29,000,000 36,300,000 33,000,000 38,400,000 42,400,000 46,800,000 49,900,000 44,900,000 50,700,000 78,000,000 82,400,000 85,600,000 93,100,000 97,000,000                                                         
        restricted cash and collateral
      811,300,000 844,100,000 851,000,000 847,100,000 815,300,000 809,800,000 839,000,000 825,100,000 836,000,000 957,600,000 866,100,000 925,400,000 936,700,000                                                                        
        investments and other assets
      126,300,000 127,600,000 129,000,000 158,100,000 153,900,000 162,400,000 85,300,000 83,800,000 82,100,000 78,800,000 79,100,000 73,800,000 85,600,000 84,300,000 220,300,000 157,000,000 201,200,000 140,800,000 132,200,000 142,000,000 140,900,000 122,400,000 132,100,000 120,500,000 139,100,000 193,500,000 205,000,000 211,800,000 212,600,000 276,400,000 296,100,000 343,600,000 470,600,000 517,900,000 561,200,000 976,400,000 910,400,000 771,600,000 619,200,000 377,800,000 382,600,000 633,400,000 671,900,000 889,900,000 902,100,000 957,300,000 1,031,800,000 1,017,200,000 1,050,400,000 1,154,800,000 1,186,700,000 1,422,100,000 1,431,800,000 1,684,600,000 1,683,800,000 1,938,300,000 2,364,400,000 878,500,000 1,051,200,000 1,056,200,000 978,800,000 838,100,000 521,200,000 560,900,000 504,800,000 542,200,000 451,900,000 408,900,000 417,500,000 397,300,000 531,200,000 432,862,000 408,614,000 597,666,000 534,513,000 456,068,000 447,532,000 5,483,638 324,696,000 316,294,000 349,654,000 371,603,000 368,162,000 359,607,000 
        deferred income taxes
      2,300,000 2,200,000 29,500,000 38,400,000 37,000,000 40,900,000 17,800,000 47,300,000 37,200,000  2,500,000 19,000,000 28,500,000 74,700,000 24,500,000 25,900,000 20,900,000    4,900,000 4,900,000 4,900,000 4,900,000 28,300,000 48,500,000 48,500,000 48,500,000 48,500,000 85,500,000 85,500,000 85,500,000 85,600,000 2,200,000  16,200,000  53,500,000 53,500,000 53,500,000 53,500,000 76,500,000 78,400,000 83,900,000 80,000,000 106,900,000 67,200,000 64,200,000 66,400,000 69,500,000 39,400,000 33,600,000 56,400,000 15,800,000 17,400,000 24,300,000 27,300,000 90,900,000 103,500,000 114,700,000 120,400,000 66,200,000 57,300,000 29,400,000 40,000,000 12,500,000   1,700,000 105,800,000 98,600,000 98,633,000 98,633,000 106,967,000 106,967,000 106,967,000 106,967,000  94,124,000 9,027,000 9,027,000 15,050,000 15,050,000 15,836,000 
        total assets
      5,710,000,000 5,807,200,000 5,744,300,000 5,763,400,000 5,783,700,000 5,953,700,000 5,866,900,000 5,878,300,000 5,728,400,000 5,962,100,000 5,722,200,000 5,828,100,000 5,799,900,000 5,610,800,000 5,431,000,000 5,299,900,000 4,943,800,000 4,442,500,000 4,453,400,000 4,486,300,000 4,667,100,000 4,860,900,000 4,948,800,000 6,230,400,000 6,542,800,000 6,792,500,000 7,121,200,000 7,287,500,000 7,423,700,000 7,520,700,000 7,795,700,000 8,014,600,000 8,181,200,000 8,073,400,000 8,315,200,000 12,836,500,000 11,777,700,000 12,235,200,000 12,065,200,000 11,495,000,000 11,021,300,000 11,663,400,000 11,861,400,000 13,151,700,000 13,191,100,000 13,544,700,000 13,692,200,000 13,845,100,000 14,133,400,000 14,890,900,000 14,927,900,000 15,471,900,000 15,809,000,000 16,850,400,000 16,693,900,000 16,937,100,000 16,733,000,000 11,691,600,000 11,745,600,000 11,523,900,000 11,363,100,000 10,972,600,000 10,097,800,000 10,055,300,000 9,955,300,000 9,859,500,000 9,623,100,000 9,667,300,000 9,822,400,000 9,603,300,000 10,488,500,000 9,338,201,000 9,668,307,000 10,454,501,000 9,685,801,000 9,540,353,000  5,808,435 6,841,602,000 6,627,373,000  6,654,795,000 6,404,661,000 6,316,398,000 
        liabilities and stockholders’ equity
                                                                                          
        current liabilities
                                                                                          
        current portion of long-term debt
      14,300,000 15,200,000 15,500,000 14,600,000 16,000,000 15,800,000 14,800,000 14,100,000 14,400,000 13,500,000 12,700,000 13,000,000 13,200,000 13,200,000 546,900,000 177,700,000 19,100,000 59,500,000 94,000,000 69,400,000 44,900,000 1,600,100,000 10,900,000 12,600,000 18,300,000 23,400,000 28,500,000 34,800,000 36,500,000 42,000,000 45,000,000 87,100,000 42,100,000 47,100,000 189,000,000 18,200,000 20,200,000 493,100,000 482,300,000 6,820,200,000 5,930,400,000 19,500,000 20,400,000 104,100,000                                         
        accounts payable and accrued expenses
      795,600,000 827,000,000 781,800,000 722,400,000 691,600,000 811,700,000 763,800,000 729,100,000 790,600,000 965,500,000 826,800,000 892,100,000 853,200,000 905,500,000 771,200,000 811,200,000 798,200,000 761,700,000 711,000,000 721,600,000 745,700,000 774,300,000 788,900,000 793,400,000 957,000,000 877,500,000 963,200,000 1,014,400,000 1,022,000,000 1,082,200,000 1,038,900,000 1,050,600,000 1,191,100,000 1,065,000,000 1,147,000,000 967,300,000 990,400,000 835,900,000 758,300,000 1,284,900,000 1,446,300,000 1,468,600,000 1,486,700,000 1,619,300,000 1,809,200,000 1,656,500,000 1,462,000,000 1,559,900,000 1,737,700,000 1,615,300,000 1,625,800,000 1,494,100,000 1,606,900,000 1,645,100,000 1,596,500,000 1,502,800,000 1,712,300,000 1,334,900,000 1,335,600,000 1,225,800,000 1,288,800,000 1,317,900,000 1,101,300,000 1,076,100,000 1,187,700,000 1,188,400,000 1,143,600,000 1,387,500,000 1,535,000,000 1,340,300,000 1,155,200,000 1,092,036,000 953,661,000 1,177,015,000 1,005,414,000 1,110,496,000 1,145,043,000 19,621 778,669,000 792,409,000 867,965,000 809,956,000 748,514,000 727,874,000 
        total current liabilities
      809,900,000 842,200,000 797,300,000 737,000,000 707,600,000 827,500,000 778,600,000 743,200,000 805,000,000 979,000,000 839,500,000 905,100,000 866,400,000 918,700,000 1,318,100,000 988,900,000 817,300,000 821,200,000 805,000,000 791,000,000 790,600,000 2,374,400,000 799,800,000 806,000,000 975,300,000 900,900,000 991,700,000 1,049,200,000 1,058,500,000 1,124,200,000 1,083,900,000 1,146,500,000 1,244,900,000 1,113,100,000 1,337,200,000 986,200,000 1,011,800,000 1,348,500,000 1,256,300,000 8,124,400,000 7,392,300,000 1,516,200,000 1,528,400,000 1,761,500,000 1,863,100,000 1,700,300,000 1,504,700,000 1,599,600,000 1,775,500,000 1,659,500,000 1,670,800,000 1,660,200,000 1,674,100,000 1,789,800,000 1,739,900,000 1,632,000,000 1,823,700,000 1,441,300,000 1,485,500,000 1,644,700,000 1,513,700,000 1,411,300,000 1,216,400,000 1,167,000,000 1,312,400,000 1,323,400,000 1,311,800,000 1,645,400,000 1,856,200,000 1,933,600,000 2,751,000,000 1,794,368,000 2,186,986,000 1,902,444,000 1,269,342,000 1,268,038,000  1,736,217 925,028,000 933,970,000  900,385,000 805,187,000 798,919,000 
        long-term debt, less current portion
      320,900,000 321,200,000 321,800,000 329,200,000 331,200,000 332,300,000 323,700,000 323,200,000 323,300,000 320,700,000 320,900,000 321,500,000 322,400,000 320,600,000 322,300,000 869,200,000 1,079,000,000 1,268,700,000 1,324,100,000 1,411,300,000 1,502,900,000  1,597,000,000 1,294,300,000 1,292,500,000 1,329,400,000 1,327,100,000 1,326,900,000 1,330,500,000 1,334,200,000 1,358,000,000 1,368,100,000 1,418,700,000 1,612,000,000 1,768,100,000 950,500,000    367,000,000 385,200,000 6,282,400,000 6,284,800,000 6,287,500,000                                         
        asset retirement obligations, less current portion
      694,400,000 692,800,000 674,500,000 673,300,000 669,600,000 667,800,000 647,400,000 645,900,000 649,000,000 648,600,000                                                                           
        accrued postretirement benefit costs
      108,800,000 109,200,000 116,400,000 117,900,000 119,200,000 120,400,000 143,100,000 144,800,000 146,300,000 148,400,000 150,600,000 153,000,000 155,600,000 156,500,000 203,900,000 206,800,000 209,600,000 402,200,000 405,900,000 410,800,000 413,200,000 419,600,000 583,000,000 587,700,000 593,400,000 516,400,000 520,900,000 543,700,000 547,700,000 723,400,000 726,800,000 727,300,000 730,000,000 745,800,000 746,300,000 753,900,000 756,300,000 715,400,000 717,800,000 720,500,000 722,900,000 782,100,000 783,400,000 782,600,000 781,900,000 712,400,000 713,000,000 711,300,000 684,000,000 954,000,000 958,400,000 958,900,000 960,700,000 1,054,300,000 1,053,900,000 1,051,600,000 1,053,100,000 965,600,000 965,500,000 965,600,000 963,900,000 907,700,000 913,500,000 912,600,000 914,100,000 767,300,000 773,000,000 782,800,000 766,100,000 771,200,000 780,600,000 785,037,000 785,708,000 1,373,292,000 1,368,793,000 1,367,726,000 1,368,686,000  971,493,000 964,582,000 959,222,000 945,670,000 942,201,000 943,377,000 
        operating lease liabilities, less current portion
      94,400,000 87,500,000 70,300,000 50,300,000 54,900,000 86,700,000 94,600,000 88,200,000 61,500,000 47,700,000 21,600,000 11,700,000 6,900,000 11,000,000 13,300,000 24,400,000 24,600,000 31,600,000 34,800,000 37,500,000 42,100,000 7,100,000 42,000,000 44,500,000 52,800,000 55,100,000 58,000,000 58,200,000                                                         
        other noncurrent liabilities
      138,000,000 145,800,000 150,800,000 143,200,000 149,100,000 169,300,000 171,300,000 170,700,000 179,500,000 181,600,000 187,400,000 224,100,000 230,400,000 223,000,000 226,900,000 231,300,000 236,000,000 221,600,000 233,100,000 251,000,000 251,500,000 258,900,000 243,600,000 272,500,000 273,400,000 300,000,000 289,200,000 345,900,000 339,300,000 374,800,000 404,000,000 451,100,000 469,400,000 573,700,000 596,900,000 511,100,000 496,200,000 504,800,000 505,500,000 722,700,000 846,700,000 932,800,000 784,600,000 992,800,000 1,042,600,000 827,100,000 716,200,000 794,800,000 1,001,600,000 814,900,000 919,200,000 772,300,000 765,500,000 743,600,000 665,300,000 674,500,000 608,500,000 466,700,000 462,900,000 456,100,000 448,300,000 459,700,000 481,900,000 459,200,000 483,500,000 444,800,000 511,900,000 677,200,000 733,100,000 358,300,000 309,500,000 316,277,000 318,127,000 431,299,000 374,124,000 380,022,000 386,256,000 21,293 350,940,000 351,942,000 330,658,000 333,790,000 326,597,000 325,528,000 
        total liabilities
      2,169,900,000 2,225,000,000 2,160,600,000 2,089,300,000 2,068,600,000 2,244,900,000 2,176,500,000 2,163,300,000 2,201,800,000 2,354,600,000 2,209,700,000 2,304,800,000 2,270,200,000 2,316,000,000 2,769,800,000 3,006,500,000 3,046,900,000 3,400,200,000 3,501,600,000 3,594,800,000 3,685,800,000 3,760,100,000 3,959,500,000 3,697,100,000 3,870,300,000 3,807,500,000 3,895,400,000 4,025,400,000 3,972,100,000 4,232,100,000 4,250,400,000 4,364,100,000 4,525,400,000 4,682,800,000 5,083,500,000 12,341,600,000 11,439,900,000 11,711,300,000 11,444,700,000 10,683,700,000 10,102,800,000 10,353,000,000 10,205,400,000 10,642,600,000 10,464,600,000 9,949,600,000 9,687,800,000 9,829,400,000 10,185,500,000 10,356,000,000 10,376,800,000 10,567,900,000 10,870,200,000 10,873,400,000 10,824,500,000 11,124,300,000 11,217,200,000 6,369,100,000 6,500,300,000 6,632,100,000 6,673,800,000 6,493,700,000 6,127,600,000 6,111,600,000 6,199,400,000 6,074,800,000 6,025,700,000 6,333,800,000 6,917,200,000 6,667,900,000 7,677,000,000 6,762,307,000 7,147,935,000 7,781,967,000 7,061,734,000 7,057,678,000  3,372,713 4,495,497,000 4,455,484,000  4,615,835,000 4,500,140,000 4,493,665,000 
        stockholders’ equity
                                                                                   2,435,722       
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2026 or december 31, 2025
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2026 or december 31, 2025
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.6 shares issued and 121.8 shares outstanding as of march 31, 2026 and 189.3 shares issued and 121.6 shares outstanding as of december 31, 2025
      1,900,000                                                                                    
        additional paid-in capital
      4,010,300,000 4,004,800,000 3,999,700,000 3,996,000,000 3,993,400,000 3,990,500,000 3,988,900,000 3,987,200,000 3,985,100,000 3,983,000,000 3,981,200,000 3,979,400,000 3,977,600,000 3,975,900,000 3,974,100,000 3,972,900,000 3,969,500,000 3,605,100,000 3,463,800,000 3,366,400,000 3,364,600,000 3,361,000,000 3,357,200,000 3,353,300,000 3,351,100,000 3,342,700,000 3,333,700,000 3,322,300,000 3,304,700,000 3,295,100,000 3,285,700,000 3,276,900,000 2,590,300,000 2,425,900,000 2,286,300,000 2,423,900,000 2,422,000,000 2,418,500,000 2,414,900,000 2,412,700,000 2,410,700,000 2,406,600,000 2,396,500,000 2,393,000,000 2,383,300,000 2,375,900,000 2,361,700,000 2,351,800,000 2,340,000,000 2,328,000,000 2,314,200,000 2,297,600,000 2,286,300,000 2,284,900,000 2,270,300,000 2,255,200,000 2,234,000,000 2,231,300,000 2,217,100,000 2,204,800,000 2,182,000,000 2,109,500,000 2,095,200,000 2,083,800,000 2,067,700,000 2,054,400,000 2,040,400,000 2,031,000,000 1,804,800,000 1,823,100,000 1,811,600,000 1,777,018,000 1,750,627,000 1,617,794,000 1,614,598,000 1,588,774,000 1,572,614,000  1,546,985,000 1,523,662,000 1,503,397,000 1,491,038,000 1,474,590,000 1,468,620,000 
        treasury stock
      -1,930,600,000 -1,927,300,000 -1,927,300,000 -1,927,300,000 -1,927,300,000 -1,926,500,000 -1,926,500,000 -1,825,500,000 -1,824,800,000 -1,740,200,000 -1,655,700,000 -1,572,400,000 -1,386,100,000 -1,372,900,000 -1,372,900,000 -1,372,900,000 -1,372,300,000 -1,370,200,000 -1,370,200,000 -1,369,500,000 -1,368,900,000 -1,368,900,000 -1,368,900,000 -1,368,100,000 -1,367,300,000 -1,337,600,000 -1,193,400,000 -1,125,300,000 -1,025,100,000 -890,000,000 -564,900,000 -351,400,000 -175,900,000 -69,200,000  -371,900,000 -371,800,000 -371,800,000 -371,800,000 -371,800,000 -371,700,000 -371,600,000 -371,500,000 -371,500,000 -467,100,000 -467,000,000 -466,900,000 -466,700,000 -464,700,000 -464,500,000 -464,400,000                                  
        retained earnings
      1,314,200,000 1,355,900,000 1,354,700,000 1,434,100,000 1,470,900,000 1,445,800,000 1,424,300,000 1,332,500,000 1,142,500,000 1,112,700,000 930,600,000 820,700,000 652,400,000 383,900,000          467,300,000 597,000,000 901,300,000 999,100,000 978,300,000 1,074,500,000 837,200,000 781,300,000 682,300,000 613,600,000 296,300,000 94,900,000        270,700,000 1,316,700,000 1,570,500,000 2,108,200,000 2,281,900,000 2,378,200,000 2,449,800,000 3,038,400,000 3,087,400,000 3,020,100,000 3,066,400,000 4,095,200,000 4,075,100,000 3,893,500,000 3,744,000,000 3,544,700,000 3,292,900,000 3,031,900,000 2,878,400,000 2,691,300,000 2,486,100,000 2,298,700,000 2,183,800,000 2,110,300,000 2,019,500,000 1,956,300,000 1,803,500,000 1,552,700,000 1,199,400,000 982,294,000 941,424,000 1,296,757,000 1,280,413,000 1,188,619,000 1,115,994,000  830,648,000 693,107,000 729,086,000 579,411,000 478,533,000 393,086,000 
        accumulated other comprehensive income
      99,400,000 101,100,000 110,800,000 120,600,000 129,000,000 138,800,000 150,700,000 161,700,000 174,500,000 189,600,000 200,600,000 215,100,000 228,900,000 242,500,000 256,200,000 269,500,000 286,400,000 171,600,000 183,400,000 194,600,000 205,800,000 201,300,000 26,500,000 22,600,000 31,600,000 31,800,000 35,300,000 38,000,000 40,100,000 -3,100,000 -1,600,000 600,000 1,400,000 1,800,000 500,000              -419,200,000 -405,900,000 -420,000,000 11,600,000 11,000,000 23,200,000     52,600,000                          
        peabody energy corporation stockholders’ equity
      3,495,200,000 3,536,400,000 3,539,800,000 3,625,300,000 3,667,900,000 3,650,500,000 3,639,300,000 3,657,800,000 3,479,200,000 3,547,000,000 3,458,600,000 3,444,700,000 3,474,700,000 3,231,300,000 2,611,200,000 2,248,200,000 1,852,800,000 981,900,000 896,500,000 839,500,000 929,600,000 1,050,700,000 939,300,000 2,476,500,000 2,613,800,000 2,939,600,000 3,176,100,000 3,214,700,000 3,395,600,000 3,240,600,000 3,501,900,000 3,609,800,000 3,606,400,000 3,347,500,000 3,183,400,000 482,600,000 330,200,000 520,700,000 617,600,000 809,700,000 916,900,000 1,305,400,000 1,653,800,000 2,505,600,000 2,724,800,000 3,593,600,000 3,960,800,000 3,972,900,000 3,908,700,000                                    
        noncontrolling interests
      44,900,000 45,800,000 43,900,000 48,800,000 47,200,000 58,300,000 51,100,000 57,200,000 47,400,000 60,500,000 53,900,000 78,600,000 55,000,000 63,500,000 50,000,000 45,200,000 44,100,000 60,400,000 55,300,000 52,000,000 51,700,000 50,100,000 50,000,000 56,800,000 58,700,000 45,400,000 49,700,000 47,400,000 56,000,000 48,000,000 43,400,000 40,700,000 49,400,000 43,100,000 48,300,000 12,300,000 7,600,000 3,200,000 2,900,000 1,600,000 1,600,000 5,000,000 2,200,000 3,500,000 1,700,000 1,500,000 43,600,000 42,800,000 39,200,000 36,100,000 31,100,000 36,100,000 33,900,000 32,400,000 35,600,000 86,200,000 30,700,000 33,500,000 29,900,000 22,900,000 28,600,000 25,200,000 14,900,000 8,300,000 6,200,000 4,100,000 7,300,000 5,300,000                 
        total stockholders’ equity
      3,540,100,000 3,582,200,000 3,583,700,000 3,674,100,000 3,715,100,000 3,708,800,000 3,690,400,000 3,715,000,000 3,526,600,000 3,607,500,000 3,512,500,000 3,523,300,000 3,529,700,000 3,294,800,000 2,661,200,000 2,293,400,000 1,896,900,000 1,042,300,000 951,800,000 891,500,000 981,300,000 1,100,800,000 989,300,000 2,533,300,000 2,672,500,000 2,985,000,000 3,225,800,000 3,262,100,000 3,451,600,000 3,288,600,000 3,545,300,000 3,650,500,000 3,655,800,000 3,390,600,000 3,231,700,000 494,900,000 337,800,000 523,900,000 620,500,000 811,300,000 918,500,000 1,310,400,000 1,656,000,000 2,509,100,000 2,726,500,000 3,595,100,000 4,004,400,000 4,015,700,000 3,947,900,000 4,534,900,000 4,551,100,000 4,904,000,000 4,938,800,000 5,977,000,000 5,869,400,000 5,812,800,000 5,515,800,000 5,322,500,000 5,245,300,000 4,891,800,000 4,689,300,000 4,478,900,000 3,970,200,000 3,943,700,000 3,755,900,000 3,784,700,000 3,597,400,000  2,903,800,000 2,934,100,000 2,807,500,000 2,573,916,000 2,519,671,000 2,642,872,000 2,584,261,000 2,449,119,000   2,333,277,000 2,159,096,000  2,037,275,000 1,902,808,000 1,821,142,000 
        total liabilities and stockholders’ equity
      5,710,000,000 5,807,200,000 5,744,300,000 5,763,400,000 5,783,700,000 5,953,700,000 5,866,900,000 5,878,300,000 5,728,400,000 5,962,100,000 5,722,200,000 5,828,100,000 5,799,900,000 5,610,800,000 5,431,000,000 5,299,900,000 4,943,800,000 4,442,500,000 4,453,400,000 4,486,300,000 4,667,100,000 4,860,900,000 4,948,800,000 6,230,400,000 6,542,800,000 6,792,500,000 7,121,200,000 7,287,500,000 7,423,700,000 7,520,700,000 7,795,700,000 8,014,600,000 8,181,200,000 8,073,400,000 8,315,200,000 12,836,500,000 11,777,700,000 12,235,200,000 12,065,200,000 11,495,000,000 11,021,300,000 11,663,400,000 11,861,400,000 13,151,700,000 13,191,100,000 13,544,700,000 13,692,200,000 13,845,100,000 14,133,400,000 14,890,900,000 14,927,900,000 15,471,900,000 15,809,000,000 16,850,400,000 16,693,900,000 16,937,100,000 16,733,000,000 11,691,600,000 11,745,600,000 11,523,900,000 11,363,100,000 10,972,600,000 10,097,800,000 10,055,300,000 9,955,300,000 9,859,500,000 9,623,100,000 9,667,300,000 9,822,400,000 9,603,300,000 10,488,500,000 9,338,201,000 9,668,307,000 10,454,501,000 9,685,801,000 9,540,353,000  5,808,435 6,841,602,000 6,627,373,000  6,654,795,000 6,404,661,000 6,316,398,000 
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of december 31, 2025 or 2024
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2025 or 2024
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.3 shares issued and 121.6 shares outstanding as of december 31, 2025 and 189.1 shares issued and 121.4 shares outstanding as of december 31, 2024
       1,900,000                                                                                   
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of september 30, 2025 and december 31, 2024
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2025 and december 31, 2024
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.3 shares issued and 121.6 shares outstanding as of september 30, 2025 and 189.1 shares issued and 121.4 shares outstanding as of december 31, 2024
        1,900,000                                                                                  
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of june 30, 2025 and december 31, 2024
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2025 and december 31, 2024
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.3 shares issued and 121.6 shares outstanding as of june 30, 2025 and 189.1 shares issued and 121.4 shares outstanding as of december 31, 2024
         1,900,000                                                                                 
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2025 and december 31, 2024
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2025 and december 31, 2024
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.3 shares issued and 121.6 shares outstanding as of march 31, 2025 and 189.1 shares issued and 121.4 shares outstanding as of december 31, 2024
          1,900,000                                                                                
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of december 31, 2024 or 2023
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2024 or 2023
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.1 shares issued and 121.4 shares outstanding as of december 31, 2024 and 188.6 shares issued and 128.7 shares outstanding as of december 31, 2023
           1,900,000                                                                               
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of september 30, 2024 and december 31, 2023
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2024 and december 31, 2023
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.1 shares issued and 121.4 shares outstanding as of september 30, 2024 and 188.6 shares issued and 128.7 shares outstanding as of december 31, 2023
            1,900,000                                                                              
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of june 30, 2024 and december 31, 2023
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2024 and december 31, 2023
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.1 shares issued and 125.9 shares outstanding as of june 30, 2024 and 188.6 shares issued and 128.7 shares outstanding as of december 31, 2023
             1,900,000                                                                             
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2024 and december 31, 2023
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2024 and december 31, 2023
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 189.0 shares issued and 125.8 shares outstanding as of march 31, 2024 and 188.6 shares issued and 128.7 shares outstanding as of december 31, 2023
              1,900,000                                                                            
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of december 31, 2023 or 2022
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2023 or 2022
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 188.6 shares issued and 128.7 shares outstanding as of december 31, 2023 and 187.1 shares issued and 143.9 shares outstanding as of december 31, 2022
               1,900,000                                                                           
        asset retirement obligations
                669,700,000 669,400,000 668,300,000 665,800,000 660,800,000 660,000,000 659,500,000 641,900,000 664,500,000 658,600,000 650,500,000 671,200,000 665,800,000 666,600,000 654,100,000 696,200,000 698,900,000 691,800,000 686,400,000 670,700,000 672,600,000 665,900,000 657,000,000 636,000,000 635,000,000 707,000,000 717,800,000 703,400,000 700,500,000 698,000,000 686,600,000 738,400,000 736,300,000 731,800,000 722,300,000 724,100,000 721,200,000 715,200,000 712,800,000 717,300,000 713,900,000 692,700,000 687,500,000 662,400,000 645,400,000 637,000,000 621,300,000 537,300,000 520,400,000 508,600,000 501,300,000 452,500,000 467,700,000 458,400,000 452,100,000 431,200,000 430,700,000 424,900,000 422,600,000 396,700,000 388,200,000 377,443,000 369,547,000 438,956,000 440,097,000 433,290,000 423,031,000  410,566,000 402,361,000 399,203,000 398,979,000 402,071,000 418,734,000 
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of september 30, 2023 and december 31, 2022
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2023 and december 31, 2022
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 188.6 shares issued and 132.2 shares outstanding as of september 30, 2023 and 187.1 shares issued and 143.9 shares outstanding as of december 31, 2022
                1,900,000                                                                          
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of june 30, 2023 and december 31, 2022
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2023 and december 31, 2022
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 188.6 shares issued and 135.9 shares outstanding as of june 30, 2023 and 187.1 shares issued and 143.9 shares outstanding as of december 31, 2022
                 1,900,000                                                                         
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2023 and december 31, 2022
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2023 and december 31, 2022
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 188.4 shares issued and 144.7 shares outstanding as of march 31, 2023 and 187.1 shares issued and 143.9 shares outstanding as of december 31, 2022
                  1,900,000                                                                        
        restricted cash and collateral arrangements
                   187,400,000                                                                       
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of december 31, 2022 or 2021
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2022 or 2021
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 187.1 shares issued and 143.9 shares outstanding as of december 31, 2022 and 176.3 shares issued and 133.3 shares outstanding as of december 31, 2021
                   1,900,000                                                                       
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of september 30, 2022 and december 31, 2021
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2022 and december 31, 2021
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 187.1 shares issued and 143.9 shares outstanding as of september 30, 2022 and 176.3 shares issued and 133.3 shares outstanding as of december 31, 2021
                    1,900,000                                                                      
        accumulated deficit
                    -248,100,000 -623,200,000 -1,032,700,000 -1,426,200,000 -1,382,000,000 -1,353,400,000                -1,121,100,000 -1,243,200,000 -1,039,500,000 -904,000,000 -668,500,000                                             
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of june 30, 2022 and december 31, 2021
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2022 and december 31, 2021
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 187.1 shares issued and 143.9 shares outstanding as of june 30, 2022 and 176.3 shares issued and 133.3 shares outstanding as of december 31, 2021
                     1,900,000                                                                     
        restricted cash
                      24,700,000  13,600,000 43,500,000             40,100,000 7,800,000  80,700,000 54,300,000 24,200,000 47,100,000 84,900,000                                             
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2022 and december 31, 2021
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2022 and december 31, 2021
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 187.0 shares issued and 143.8 shares outstanding as of march 31, 2022 and 176.3 shares issued and 133.3 shares outstanding as of december 31, 2021
                      1,900,000                                                                    
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of september 30, 2021 and december 31, 2020
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2021 and december 31, 2020
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 165.3 shares issued and 122.3 shares outstanding as of september 30, 2021 and 140.5 shares issued and 97.8 shares outstanding as of december 31, 2020
                       1,600,000                                                                   
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of june 30, 2021 and december 31, 2020
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2021 and december 31, 2020
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 154.1 shares issued and 111.1 shares outstanding as of june 30, 2021 and 140.5 shares issued and 97.8 shares outstanding as of december 31, 2020
                        1,500,000                                                                  
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2021 and december 31, 2020
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2021 and december 31, 2020
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 141.2 shares issued and 98.3 shares outstanding as of march 31, 2021 and 140.5 shares issued and 97.8 shares outstanding as of december 31, 2020
                         1,400,000                                                                 
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of december 31, 2020 or december 31, 2019
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2020 or december 31, 2019
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 140.5 shares issued and 97.8 shares outstanding as of december 31, 2020 and 139.2 shares issued and 96.9 shares outstanding as of december 31, 2019
                          1,400,000                                                                
        (accumulated deficit) retained earnings
                          -1,273,300,000 -1,144,100,000 -1,076,900,000                  -503,400,000 -34,000,000                                           
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of september 30, 2020 and december 31, 2019
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2020 and december 31, 2019
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 140.5 shares issued and 97.8 shares outstanding as of september 30, 2020 and 139.2 shares issued and 96.9 shares outstanding as of december 31, 2019
                           1,400,000                                                               
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of june 30, 2020 and december 31, 2019
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2020 and december 31, 2019
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 140.5 shares issued and 97.8 shares outstanding as of june 30, 2020 and 139.2 shares issued and 96.9 shares outstanding as of december 31, 2019
                            1,400,000                                                              
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2020 and december 31, 2019
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2020 and december 31, 2019
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 139.6 shares issued and 97.2 shares outstanding as of march 31, 2020 and 139.2 shares issued and 96.9 shares outstanding as of december 31, 2019
                             1,400,000                                                             
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of december 31, 2019 or december 31, 2018
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2019 or december 31, 2018
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 139.2 shares issued and 96.9 shares outstanding as of december 31, 2019 and 137.7 shares issued and 110.4 shares outstanding as of december 31, 2018
                              1,400,000                                                            
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of september 30, 2019 and december 31, 2018
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2019 and december 31, 2018
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 139.1 shares issued and 98.8 shares outstanding as of september 30, 2019 and 137.7 shares issued and 110.4 shares outstanding as of december 31, 2018
                               1,400,000                                                           
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of june 30, 2019 and december 31, 2018
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2019 and december 31, 2018
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 139.1 shares issued and 106.2 shares outstanding as of june 30, 2019 and 137.7 shares issued and 110.4 shares outstanding as of december 31, 2018
                                1,400,000                                                          
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2019 and december 31, 2018
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2019 and december 31, 2018
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 137.9 shares issued and 107.5 shares outstanding as of march 31, 2019 and 137.7 shares issued and 110.4 shares outstanding as of december 31, 2018
                                 1,400,000                                                         
        collateral arrangements
                                                                                          
        series a convertible preferred stock — 0.01 per share par value; no shares authorized, issued or outstanding as of december 31, 2018 and 50.0 shares authorized, 30.0 issued and 13.5 shares outstanding as of december 31, 2017
                                                                                          
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of december 31, 2018 and 50.0 shares authorized, no shares issued or outstanding as of december 31, 2017
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2018 or december 31, 2017
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 137.7 shares issued and 110.4 shares outstanding as of december 31, 2018 and 111.8 shares issued and 105.2 shares outstanding as of december 31, 2017
                                  1,400,000                                                        
        series a convertible preferred stock — 0.01 per share par value; no shares authorized, issued or outstanding as of september 30, 2018 and 50.0 shares authorized, 30.0 shares issued and 13.5 shares outstanding as of december 31, 2017
                                                                                          
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of september 30, 2018 and 50.0 shares authorized, no shares issued or outstanding as of december 31, 2017
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2018 or december 31, 2017
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 137.7 shares issued and 114.5 shares outstanding as of september 30, 2018 and 111.8 shares issued and 105.2 shares outstanding as of december 31, 2017
                                   1,400,000                                                       
        series a convertible preferred stock — 0.01 per share par value; no shares authorized, issued or outstanding as of june 30, 2018 and 50.0 shares authorized, 30.0 shares issued and 13.5 shares outstanding as of december 31, 2017
                                                                                          
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of june 30, 2018 and 50.0 shares authorized, no shares issued or outstanding as of december 31, 2017
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2018 or december 31, 2017
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 137.7 shares issued and 122.3 shares outstanding as of june 30, 2018 and 111.8 shares issued and 105.2 shares outstanding as of december 31, 2017
                                    1,400,000                                                      
        assets from coal trading activities
                                     11,200,000 2,600,000 2,500,000 600,000 600,000 700,000 19,900,000 17,300,000 21,200,000 23,500,000 42,300,000 44,100,000 61,800,000 57,600,000 52,700,000 50,800,000 50,200,000 36,100,000 43,000,000 56,600,000 57,900,000 52,400,000 56,200,000 80,300,000 43,300,000 44,600,000 66,000,000 109,200,000 166,200,000 192,500,000 170,500,000 197,800,000 278,700,000 276,800,000 360,400,000 448,300,000 570,300,000 662,800,000 710,700,000 1,392,500,000 556,105,000 966,548,000 706,017,000 270,334,000 162,018,000 150,373,000  84,692,000 77,638,000 146,596,000 85,554,000 52,834,000 74,272,000 
        collateral arrangements - current
                                     109,100,000                                                     
        liabilities from coal trading activities
                                     8,800,000 11,700,000 1,000,000 1,200,000 700,000 1,200,000 19,500,000 15,700,000 19,300,000 15,600,000 28,100,000 21,300,000 38,100,000 32,700,000 22,400,000 14,400,000 11,600,000 6,100,000 10,000,000 17,000,000 21,900,000 19,400,000 19,900,000 22,000,000 14,600,000 10,300,000 62,600,000 106,100,000 157,400,000 181,700,000 51,900,000 79,900,000 76,600,000 110,600,000 121,300,000 147,800,000 206,200,000 304,200,000 549,100,000 1,459,900,000 474,640,000 918,596,000 662,255,000 227,135,000 123,665,000 126,731,000  74,271,000 63,655,000 132,373,000 67,398,000 34,812,000 50,044,000 
        series a convertible preferred stock — 0.01 per share par value; no shares authorized, issued or outstanding as of march 31, 2018 and 50.0 shares authorized, 30.0 shares issued and 13.5 shares outstanding as of december 31, 2017
                                                                                          
        preferred stock — 0.01 per share par value; 100.0 shares authorized, no shares issued or outstanding as of march 31, 2018 and 50.0 shares authorized, no shares issued or outstanding as of december 31, 2017
                                                                                          
        series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of march 31, 2018 or december 31, 2017
                                                                                          
        common stock — 0.01 per share par value; 450.0 shares authorized, 137.3 shares issued and 126.3 shares outstanding as of march 31, 2018 and 111.8 shares issued and 105.2 shares outstanding as of december 31, 2017
                                     1,400,000                                                     
        restricted cash collateral
                                      323,100,000 530,300,000 561,700,000                                                  
        total liabilities not subject to compromise
                                      4,525,400,000 4,682,800,000 5,083,500,000 3,924,900,000 2,999,700,000 3,379,700,000 3,238,900,000                                              
        liabilities subject to compromise
                                         8,416,700,000 8,440,200,000 8,331,600,000 8,205,800,000                                              
        predecessor preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of december 31, 2016
                                                                                          
        predecessor perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of december 31, 2016
                                                                                          
        predecessor series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of december 31, 2016
                                                                                          
        predecessor common stock — 0.01 per share par value; 53.3 shares authorized, 19.3 shares issued and 18.5 shares outstanding as of december 31, 2016
                                                                                          
        successor series a convertible preferred stock — 0.01 per share par value; 50.0 shares authorized, 30.0 shares issued and 13.5 shares outstanding as of december 31, 2017
                                      576,000,000                                                    
        successor preferred stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2017
                                                                                          
        successor series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of december 31, 2017
                                                                                          
        successor common stock — 0.01 per share par value; 450.0 shares authorized, 111.8 shares issued and 105.2 shares outstanding as of december 31, 2017
                                      1,000,000                                                    
        predecessor preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as december 31, 2016
                                                                                          
        predecessor common stock — 0.01 per share par value; 53.3 shares authorized,19.3 shares issued and 18.5 shares outstanding as of december 31, 2016
                                                                                          
        successor series a convertible preferred stock — 0.01 per share par value; 50.0 shares authorized, 30.0 shares issued and 15.9 shares outstanding as of september 30, 2017
                                       691,700,000                                                   
        successor preferred stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2017
                                                                                          
        successor series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of september 30, 2017
                                                                                          
        successor common stock — 0.01 per share par value; 450.0 shares authorized, 106.0 shares issued and 102.7 shares outstanding as of september 30, 2017
                                       1,000,000                                                   
        successor series a convertible preferred stock — 0.01 per share par value; 50.0 shares authorized, 30.0 shares issued and 18.4 shares outstanding as of june 30, 2017
                                        800,700,000                                                  
        successor preferred stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2017
                                                                                          
        successor series common stock — 0.01 per share par value; 50.0 shares authorized, no shares issued or outstanding as of june 30, 2017
                                                                                          
        successor common stock — 0.01 per share par value; 450.0 shares authorized, 70.9 shares issued and 100.2 shares outstanding as of june 30, 2017
                                        1,000,000                                                  
        successor notes issuance proceeds - restricted cash
                                         1,000,000,000                                                 
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of march 31, 2017 or december 31, 2016
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of march 31, 2017 or december 31, 2016
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of march 31, 2017 or december 31, 2016
                                                                                          
        common stock — 0.01 per share par value; 53.3 shares authorized,19.3 shares issued and 18.5 shares outstanding as of march 31, 2017 and december 31, 2016
                                         200,000                                                 
        accumulated other comprehensive loss
                                         -448,500,000 -477,000,000 -486,700,000 -521,700,000 -562,900,000 -618,900,000 -695,800,000 -644,800,000 -835,500,000 -764,800,000 -426,400,000 -218,800,000 -293,300,000       -53,200,000 -63,700,000 -142,400,000 -139,100,000  -20,900,000 -67,900,000 -20,400,000 -299,700,000 -121,000,000 -183,500,000 -65,900,000 -151,700,000 -341,300,000 -388,500,000 -267,100,000 -87,300,000 -69,652,000 -67,066,000 -170,598,000 -209,668,000 -227,235,000 -249,058,000  -31,625,000 -44,931,000 -46,795,000 -24,251,000 -41,008,000 -30,875,000 
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of december 31, 2016 or december 31, 2015
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of december 31, 2016 or december 31, 2015
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of december 31, 2016 or december 31, 2015
                                                                                          
        common stock — 0.01 per share par value; 53.3 shares authorized, 19.3 shares issued and 18.5 shares outstanding as of december 31, 2016 and december 31, 2015
                                          200,000                                                
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of september 30, 2016 or december 31, 2015
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of september 30, 2016 or december 31, 2015
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of september 30, 2016 or december 31, 2015
                                                                                          
        common stock — 0.01 per share par value; 53.3 shares authorized,19.3 shares issued and 18.5 shares outstanding as of september 30, 2016 and december 31, 2015
                                           200,000                                               
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of june 30, 2016 or december 31, 2015
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of june 30, 2016 or december 31, 2015
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of june 30, 2016 or december 31, 2015
                                                                                          
        common stock — 0.01 per share par value; 53.3 shares authorized,19.3 shares issued and 18.5 shares outstanding as of june 30, 2016 and december 31, 2015
                                            200,000                                              
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of march 31, 2016 or december 31, 2015
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of march 31, 2016 or december 31, 2015
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of march 31, 2016 or december 31, 2015
                                                                                          
        common stock — 0.01 per share par value; 53.3 shares authorized,19.3 shares issued and 18.5 shares outstanding as of march 31, 2016 and december 31, 2015
                                             200,000                                             
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of december 31, 2015 or december 31, 2014
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of december 31, 2015 or december 31, 2014
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of december 31, 2015 or december 31, 2014
                                                                                          
        common stock — 0.01 per share par value; 53.3 shares authorized, 19.3 shares issued and 18.5 shares outstanding as of december 31, 2015 and 19.0 shares issued and 18.1 shares outstanding as of december 31, 2014
                                              200,000                                            
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of september 30, 2015 or december 31, 2014
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of september 30, 2015 or december 31, 2014
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of september 30, 2015 or december 31, 2014
                                                                                          
        common stock — 0.01 per share par value; 53.3 shares authorized; 19.3 shares issued and 18.5 shares outstanding as of september 30, 2015 and 19.0 shares issued and 18.1 shares outstanding as of december 31, 2014
                                               200,000                                           
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of june 30, 2015 or december 31, 2014
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of june 30, 2015 or december 31, 2014
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of june 30, 2015 or december 31, 2014
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized; 289.7 shares issued and 278.4 shares outstanding as of june 30, 2015 and 285.7 shares issued and 271.7 shares outstanding as of december 31, 2014
                                                2,900,000                                          
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of march 31, 2015 or december 31, 2014
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of march 31, 2015 or december 31, 2014
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of march 31, 2015 or december 31, 2014
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized; 289.0 shares issued and 277.8 shares outstanding as of march 31, 2015 and 285.7 shares issued and 271.7 shares outstanding as of december 31, 2014
                                                 2,900,000                                         
        current maturities of long-term debt
                                                  21,200,000 21,400,000 20,800,000 20,800,000 31,700,000 34,200,000 26,000,000 139,500,000 47,800,000 124,800,000 121,400,000 114,600,000 101,100,000 43,800,000 43,800,000 261,500,000 43,200,000 41,500,000 35,200,000 14,300,000 14,100,000 13,700,000 16,400,000 16,700,000 17,000,000 44,200,000 135,900,000 227,692,000 134,373,000 63,174,000 36,793,000 33,877,000 95,757,000 16,500 72,088,000 77,906,000 22,585,000 23,031,000 21,861,000 21,001,000 
        long-term debt, less current maturities
                                                  5,965,600,000 5,969,700,000 5,973,200,000 5,977,400,000 5,970,700,000 5,973,300,000 5,962,000,000 6,006,200,000 6,205,100,000 6,238,300,000 6,264,000,000 6,538,400,000 6,556,400,000 2,458,600,000 2,468,200,000 2,478,900,000 2,706,800,000 2,714,600,000 2,727,600,000 2,734,700,000 2,738,200,000 2,763,200,000 2,766,200,000 2,769,400,000 3,139,200,000 3,107,600,000 3,122,700,000 3,137,356,000 3,138,727,000 3,152,967,000 3,155,207,000 3,170,966,000 3,168,069,000 1,601,148 1,308,565,000 1,332,526,000 1,382,921,000 1,384,263,000 1,393,049,000 1,374,718,000 
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of december 31, 2014 or december 31, 2013
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of december 31, 2014 or december 31, 2013
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of december 31, 2014 or december 31, 2013
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 285.7 shares issued and 271.7 shares outstanding as of december 31, 2014 and 283.9 shares issued and 270.1 shares outstanding as of december 31, 2013
                                                  2,900,000                                        
        preferred stock — 0.01 per share par value; 10.0 shares authorized; no shares issued or outstanding as of september 30, 2014 or december 31, 2013
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of september 30, 2014 or december 31, 2013
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of september 30, 2014 or december 31, 2013
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 285.4 shares issued and 271.4 shares outstanding as of september 30, 2014 and 283.9 shares issued and 270.1 shares outstanding as of december 31, 2013
                                                   2,900,000                                       
        preferred stock — 0.01 per share par value; 10.0 shares authorized; no shares issued or outstanding as of june 30, 2014 or december 31, 2013
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of june 30, 2014 or december 31, 2013
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of june 30, 2014 or december 31, 2013
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 285.4 shares issued and 271.5 shares outstanding as of june 30, 2014 and 283.9 shares issued and 270.1 shares outstanding as of december 31, 2013
                                                    2,900,000                                      
        preferred stock — 0.01 per share par value; 10.0 shares authorized; no shares issued or outstanding as of march 31, 2014 or december 31, 2013
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of march 31, 2014 or december 31, 2013
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of march 31, 2014 or december 31, 2013
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 285.2 shares issued and 271.3 shares outstanding as of march 31, 2014 and 283.9 shares issued and 270.1 shares outstanding as of december 31, 2013
                                                     2,900,000                                     
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of december 31, 2013 or december 31, 2012
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of december 31, 2013 or december 31, 2012
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of december 31, 2013 or december 31, 2012
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 283.9 shares issued and 270.1 shares outstanding as of december 31, 2013 and 282.3 shares issued and 268.6 shares outstanding as of december 31, 2012
                                                      2,800,000                                    
        land and coal interests
                                                       11,051,400,000 10,957,500,000 10,947,600,000 10,947,700,000 11,875,200,000 11,935,800,000 11,542,100,000 10,781,000,000 7,841,300,000 7,729,700,000 7,687,500,000 7,657,000,000 7,586,700,000 7,585,500,000 7,576,000,000  7,505,400,000 7,511,200,000 7,429,000,000 7,354,700,000 7,365,200,000 7,251,100,000 7,217,198,000 7,198,090,000 7,434,846,000 7,341,559,000 7,275,088,000 7,127,385,000    4,775,126,000    
        buildings and improvements
                                                       1,904,800,000 1,412,400,000 1,345,700,000 1,321,300,000 1,268,300,000 1,256,700,000 1,229,800,000 1,131,400,000 1,087,700,000 1,090,000,000 1,086,500,000 1,079,800,000 986,700,000 972,200,000 910,100,000 908,000,000 887,700,000 876,300,000 862,700,000 861,300,000 707,500,000 699,800,000 701,158,000 700,509,000 902,222,000 900,228,000 897,200,000 893,049,000    793,254,000    
        machinery and equipment
                                                       2,617,200,000 3,075,800,000 3,109,300,000 3,162,200,000 3,175,800,000 2,954,700,000 2,743,000,000  2,175,800,000 1,952,900,000 1,731,600,000 1,699,300,000 1,560,000,000 1,489,800,000 1,456,600,000 1,391,200,000 1,315,100,000 1,296,900,000 1,287,300,000 1,265,800,000 1,389,800,000 1,377,400,000 1,306,757,000 1,267,328,000 1,702,581,000 1,620,211,000 1,576,032,000 1,516,765,000    1,237,184,000    
        less: accumulated depreciation, depletion and amortization
                                                       -4,125,100,000 -3,953,700,000 -3,804,900,000 -3,629,500,000 -3,808,200,000 -3,711,600,000 -3,545,800,000 -3,412,100,000 -3,296,700,000 -3,188,600,000 -3,084,100,000 -3,010,000,000 -2,914,300,000 -2,801,100,000 -2,696,900,000 -2,595,000,000 -2,480,000,000                   
        preferred stock — 0.01 per share par value; 10.0 shares authorized; no shares issued or outstanding as of september 30, 2013 or december 31, 2012
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of september 30, 2013 or december 31, 2012
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of september 30, 2013 or december 31, 2012
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 283.6 shares issued and 269.8 shares outstanding as of september 30, 2013 and 282.3 shares issued and 268.6 shares outstanding as of december 31, 2012
                                                       2,800,000                                   
        peabody energy corporation’s stockholders’ equity
                                                       4,498,800,000 4,520,000,000 4,867,900,000 4,904,900,000 5,944,600,000 5,833,800,000 5,726,600,000 5,485,100,000 5,289,000,000 5,215,400,000 4,868,900,000 4,660,700,000 4,453,700,000 3,955,300,000 3,935,400,000 3,749,700,000 3,780,600,000 3,590,100,000                  
        preferred stock — 0.01 per share par value; 10.0 shares authorized; no shares issued or outstanding as of june 30, 2013 or december 31, 2012
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of june 30, 2013 or december 31, 2012
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of june 30, 2013 or december 31, 2012
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 283.7 shares issued and 269.9 shares outstanding as of june 30, 2013 and 282.3 shares issued and 268.6 shares outstanding as of december 31, 2012
                                                        2,800,000                                  
        preferred stock — 0.01 per share par value; 10.0 shares authorized; no shares issued or outstanding as of march 31, 2013 or december 31, 2012
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of march 31, 2013 or december 31, 2012
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of march 31, 2013 or december 31, 2012
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 283.4 shares issued and 269.6 shares outstanding as of march 31, 2013 and 282.3 shares issued and 268.6 shares outstanding as of december 31, 2012
                                                         2,800,000                                 
        treasury shares, at cost: 13.8 shares as of march 31, 2013 and 13.7 shares as of december 31, 2012
                                                         -464,200,000                                 
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of december 31, 2012 or december 31, 2011
                                                                                          
        series a junior participating preferred stock - 0.01 per share par value; no shares authorized as of december 31, 2012 and 1.5 shares authorized as of december 31, 2011; no shares issued or outstanding as of december 31, 2012 or december 31, 2011
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of december 31, 2012 or december 31, 2011
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of december 31, 2012 or december 31, 2011
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 282.3 shares issued and 268.6 shares outstanding as of december 31, 2012 and 280.3 shares issued and 271.1 shares outstanding as of december 31, 2011
                                                          2,800,000                                
        treasury shares, at cost: 13.7 shares as of december 31, 2012 and 9.2 shares as of december 31, 2011
                                                          -461,600,000                                
        preferred stock — 0.01 per share par value; 10.0 shares authorized; no shares issued or outstanding as of september 30, 2012 or december 31, 2011
                                                                                          
        series a junior participating preferred stock — 0.01 per share par value; no shares authorized as of september 30, 2012 and 1.5 shares authorized as of december 31, 2011; no shares issued or outstanding as of september 30, 2012 or december 31, 2011
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of september 30, 2012 or december 31, 2011
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of september 30, 2012 or december 31, 2011
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 282.0 shares issued and 268.3 shares outstanding as of september 30, 2012 and 280.3 shares issued and 271.1 shares outstanding as of december 31, 2011
                                                           2,800,000                               
        treasury shares, at cost: 13.7 shares as of september 30, 2012 and 9.2 shares as of december 31, 2011
                                                           -461,500,000                               
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of june 30, 2012 or december 31, 2011
                                                                                          
        series a junior participating preferred stock — 0.01 per share par value; 1.5 shares authorized, no shares issued or outstanding as of june 30, 2012 or december 31, 2011
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of june 30, 2012 or december 31, 2011
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of june 30, 2012 or december 31, 2011
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 282.0 shares issued and 268.3 shares outstanding as of june 30, 2012 and 280.3 shares issued and 271.1 shares outstanding as of december 31, 2011
                                                            2,800,000                              
        treasury shares, at cost: 13.7 shares as of june 30, 2012 and 9.2 shares as of december 31, 2011
                                                            -461,200,000                              
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of march 31, 2012 or december 31, 2011
                                                                                          
        series a junior participating preferred stock — 0.01 per share par value; 1.5 shares authorized, no shares issued or outstanding as of march 31, 2012 or december 31, 2011
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of march 31, 2012 or december 31, 2011
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of march 31, 2012 or december 31, 2011
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 281.7 shares issued and 272.3 shares outstanding as of march 31, 2012 and 280.3 shares issued and 271.1 shares outstanding as of december 31, 2011
                                                             2,800,000                             
        treasury shares, at cost: 9.4 shares as of march 31, 2012 and 9.2 shares as of december 31, 2011
                                                             -361,200,000                             
        plant and equipment
                                                              2,862,400,000                            
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of december 31, 2011 or december 31, 2010
                                                                                          
        series a junior participating preferred stock - 0.01 per share par value; 1.5 shares authorized, no shares issued or outstanding as of december 31, 2011 or december 31, 2010
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of december 31, 2011 or december 31, 2010
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of december 31, 2011 or december 31, 2010
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 280.3 shares issued and 271.1 shares outstanding as of december 31, 2011 and 279.1 shares issued and 270.2 shares outstanding as of december 31, 2010
                                                              2,800,000                            
        treasury shares, at cost: 9.2 shares as of december 31, 2011 and 8.9 shares as of december 31, 2010
                                                              -353,300,000                            
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of september 30, 2011 or december 31, 2010
                                                                                          
        series a junior participating preferred stock — 0.01 per share par value; 1,500,000 shares authorized, no shares issued or outstanding as of september 30, 2011 or december 31, 2010
                                                                                          
        perpetual preferred stock — 800,000 shares authorized, no shares issued or outstanding as of september 30, 2011 or december 31, 2010
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of september 30, 2011 or december 31, 2010
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 279,986,117 shares issued and 270,818,478 shares outstanding as of september 30, 2011 and 279,149,028 shares issued and 270,236,256 shares outstanding as of december 31, 2010
                                                               2,800,000                           
        treasury shares, at cost: 9,167,639 shares as of september 30, 2011 and 8,912,772 shares as of december 31, 2010
                                                               -350,700,000                           
        short-term investments
                                                                75,000,000 100,000,000                         
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of june 30, 2011 or december 31, 2010
                                                                                          
        series a junior participating preferred stock — 0.01 per share par value; 1,500,000 shares authorized, no shares issued or outstanding as of june 30, 2011 or december 31, 2010
                                                                                          
        perpetual preferred stock — 800,000 shares authorized, no shares issued or outstanding as of june 30, 2011 or december 31, 2010
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of june 30, 2011 or december 31, 2010
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 279,981,794 shares issued and 270,829,764 shares outstanding as of june 30, 2011 and 279,149,028 shares issued and 270,236,256 shares outstanding as of december 31, 2010
                                                                2,800,000                          
        treasury shares, at cost: 9,152,030 shares as of june 30, 2011 and 8,912,772 shares as of december 31, 2010
                                                                -350,000,000                          
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of march 31, 2011 or december 31, 2010
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of march 31, 2011 or december 31, 2010
                                                                                          
        perpetual preferred stock — 800,000 shares authorized, no shares issued or outstanding as of march 31, 2011 or december 31, 2010
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of march 31, 2011 or december 31, 2010
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 279,825,706 shares issued and 270,677,543 shares outstanding as of march 31, 2011 and 279,149,028 shares issued and 270,236,256 shares outstanding as of december 31, 2010
                                                                 2,800,000                         
        treasury shares, at cost: 9,148,163 shares as of march 31, 2011 and 8,912,772 shares as of december 31, 2010
                                                                 -349,700,000                         
        december 31, 2010 and 18.3 at december 31, 2009
                                                                  558,200,000                        
        preferred stock — 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of december 31, 2010 or december 31, 2009
                                                                                          
        series a junior participating preferred stock — 1.5 shares authorized, no shares issued or outstanding as of december 31, 2010 or december 31, 2009
                                                                                          
        perpetual preferred stock — 0.8 shares authorized, no shares issued or outstanding as of december 31, 2010 or december 31, 2009
                                                                                          
        series common stock — 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of december 31, 2010 or december 31, 2009
                                                                                          
        common stock — 0.01 per share par value; 800.0 shares authorized, 279.1 shares issued and 270.2 shares outstanding as of december 31, 2010 and 276.8 shares issued and 268.2 shares outstanding as of december 31, 2009
                                                                  2,800,000                        
        treasury shares, at cost: 8.9 shares as of december 31, 2010 and 8.6 shares as of december 31, 2009
                                                                  -334,600,000                        
        preferred stock – 0.01 per share par value; 10.0 shares authorized, no shares issued or outstanding as of september 30, 2010 or december 31, 2009
                                                                                          
        series a junior participating preferred stock – 1.5 shares authorized, no shares issued or outstanding as of september 30, 2010 or december 31, 2009
                                                                                          
        perpetual preferred stock – 0.8 shares authorized, no shares issued or outstanding as of september 30, 2010 or december 31, 2009
                                                                                          
        series common stock – 0.01 per share par value; 40.0 shares authorized, no shares issued or outstanding as of september 30, 2010 or december 31, 2009
                                                                                          
        common stock – 0.01 per share par value; 800.0 shares authorized, 278.4 shares issued and 269.6 shares outstanding as of september 30, 2010 and 276.8 shares issued and 268.2 shares outstanding as of december 31, 2009
                                                                   2,800,000                       
        treasury shares, at cost: 8.8 shares as of september 30, 2010 and 8.6 shares as of december 31, 2009
                                                                   -329,500,000                       
        preferred stock - 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of june 30, 2010 or december 31, 2009
                                                                                          
        series a junior participating preferred stock - 1,500,000 shares authorized, no shares issued or outstanding as of june 30, 2010 or december 31, 2009
                                                                                          
        perpetual preferred stock - 750,000 shares authorized, no shares issued or outstanding as of june 30, 2010 or december 31, 2009
                                                                                          
        series common stock - 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of june 30, 2010 or december 31, 2009
                                                                                          
        common stock - 0.01 per share par value; 800,000,000 shares authorized, 277,760,081 shares issued and 268,938,289 shares outstanding as of june 30, 2010 and 276,848,279 shares issued and 268,203,815 shares outstanding as of december 31, 2009
                                                                    2,800,000                      
        treasury shares, at cost: 8,821,792 shares as of june 30, 2010 and 8,644,464 shares as of december 31, 2009
                                                                    -329,100,000                      
        preferred stock – 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of march 31, 2010 or december 31, 2009
                                                                                          
        series a junior participating preferred stock – 1,500,000 shares authorized, no shares issued or outstanding as of march 31, 2010 or december 31, 2009
                                                                                          
        perpetual preferred stock – 750,000 shares authorized, no shares issued or outstanding as of march 31, 2010 or december 31, 2009
                                                                                          
        series common stock – 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of march 31, 2010 or december 31, 2009
                                                                                          
        common stock – 0.01 per share par value; 800,000,000 shares authorized, 277,597,943 shares issued and 268,779,512 shares outstanding as of march 31, 2010 and 276,848,279 shares issued and 268,203,815 shares outstanding as of december 31, 2009
                                                                     2,800,000                     
        treasury shares, at cost: 8,818,431 shares as of march 31, 2010 and 8,644,464 shares as of december 31, 2009
                                                                     -328,900,000                     
        property, plant, equipment and mine development land and coal interests
                                                                      7,557,300,000                    
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of december 31, 2009 or december 31, 2008
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of december 31, 2009 or december 31, 2008
                                                                                          
        perpetual preferred stock — 750,000 shares authorized, no shares issued or outstanding as of december 31, 2009 or december 31, 2008
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of december 31, 2009 or december 31, 2008
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 276,848,279 shares issued and 268,203,815 shares outstanding as of december 31, 2009 and 275,211,240 shares issued and 266,644,979 shares outstanding as of december 31, 2008
                                                                      2,800,000                    
        treasury shares, at cost: 8,644,464 shares as of december 31, 2009 and 8,566,261 shares as of december 31, 2008
                                                                      -321,100,000                    
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of september 30, 2009 or december 31, 2008
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of september 30, 2009 or december 31, 2008
                                                                                          
        perpetual preferred stock — 750,000 shares authorized, no shares issued or outstanding as of september 30, 2009 or december 31, 2008
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of september 30, 2009 or december 31, 2008
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 276,370,726 shares issued and 267,728,748 shares outstanding as of september 30, 2009 and 275,211,240 shares issued and 266,644,979 shares outstanding as of december 31, 2008
                                                                       2,800,000                   
        treasury shares, at cost: 8,641,978 shares as of september 30, 2009 and 8,566,261 shares as of december 31, 2008
                                                                       -321,000,000                   
        less accumulated depreciation, depletion and amortization
                                                                        -2,371,100,000 -2,270,300,000 -2,166,600,000 -2,075,100,000 -1,985,800,000 -1,891,599,000 -1,833,527,000 -2,207,312,000 -2,098,057,000 -2,085,299,000 -1,985,682,000    -1,627,856,000    
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of june 30, 2009 or december 31, 2008
                                                                                          
        series a junior participating preferred stock - 1,500,000 shares authorized, no shares issued or outstanding as of june 30, 2009 or december 31, 2008
                                                                                          
        perpetual preferred stock - 750,000 shares authorized, no shares issued or outstanding as of june 30, 2009 or december 31, 2008
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of june 30, 2009 or december 31, 2008
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 276,184,369 shares issued and 267,544,069 shares outstanding as of june 30, 2009 and 275,211,240 shares issued and 266,644,979 shares outstanding as of december 31, 2008
                                                                        2,800,000                  
        treasury shares, at cost: 8,640,300 shares as of june 30, 2009 and 8,566,261
                                                                                          
        shares as of december 31, 2008
                                                                        -320,900,000                  
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of march 31, 2009 or december 31, 2008
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of march 31, 2009 or december 31, 2008
                                                                                          
        perpetual preferred stock — 750,000 shares authorized, no shares issued or outstanding as of march 31, 2009 or december 31, 2008
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of march 31, 2009 or december 31, 2008
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 275,986,452 shares issued and 267,355,507 shares outstanding as of march 31, 2009 and 275,211,240 shares issued and 266,644,979 shares outstanding as of december 31, 2008
                                                                         2,800,000                 
        treasury shares, at cost: 8,630,945 shares as of march 31, 2009 and 8,566,261 shares as of december 31, 2008
                                                                         -320,600,000                 
        peabody energy stockholders’ equity
                                                                         3,328,200,000                 
        total equity
                                                                         3,333,500,000                 
        property, plant, equipment and mine development mine development
                                                                                          
        minority interests
                                                                          1,400,000 1,300,000 4,000,000 1,978,000  29,662,000 39,806,000 33,556,000 33,337,000  12,828,000 12,793,000 2,550,000 1,685,000 1,713,000 1,591,000 
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of december 31, 2008 or 2007
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of december 31, 2008 or 2007
                                                                                          
        perpetual preferred stock — 750,000 shares authorized, no shares issued or outstanding as of december 31, 2008 or 2007
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of december 31, 2008 or 2007
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 275,211,240 shares issued and 266,644,979 shares outstanding as of december 31, 2008 and 800,000,000 shares authorized, 272,911,564 shares issued and 270,066,621 shares outstanding as of december 31, 2007
                                                                          2,800,000                
        treasury shares, at cost: 8,566,261 shares as of december 31, 2008 and 2,844,943 shares as of december 31, 2007
                                                                          -318,800,000                
        preferred stock – 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of september 30, 2008 or december 31, 2007
                                                                                          
        series a junior participating preferred stock – 1,500,000 shares authorized, no shares issued or outstanding as of september 30, 2008 or december 31, 2007
                                                                                          
        perpetual preferred stock – 750,000 shares authorized, no shares issued or outstanding as of september 30, 2008 or december 31, 2007
                                                                                          
        series common stock – 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of september 30, 2008 or december 31, 2007
                                                                                          
        common stock – 0.01 per share par value; 800,000,000 shares authorized, 274,980,783 shares issued and 270,746,628 shares outstanding as of september 30, 2008 and 272,911,564 shares issued and 270,066,621 shares outstanding as of december 31, 2007
                                                                           2,700,000               
        treasury shares, at cost: 4,234,155 shares as of september 30, 2008 and 2,844,943 shares as of december 31, 2007
                                                                           -177,300,000               
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of june 30, 2008 or december 31, 2007
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of june 30, 2008 or december 31, 2007
                                                                                          
        perpetual preferred stock — 750,000 shares authorized, no shares issued or outstanding as of june 30, 2008 or december 31, 2007
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of june 30, 2008 or december 31, 2007
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 274,916,296 shares issued and 271,875,929 shares outstanding as of june 30, 2008 and 272,911,564 shares issued and 270,066,621 shares outstanding as of december 31, 2007
                                                                            2,700,000              
        treasury shares, at cost: 3,040,367 shares as of june 30, 2008 and 2,844,943 shares as of december 31, 2007
                                                                            -118,900,000              
        preferred stock – 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of march 31, 2008 or december 31, 2007
                                                                                          
        series a junior participating preferred stock – 1,500,000 shares authorized, no shares issued or outstanding as of march 31, 2008 or december 31, 2007
                                                                                          
        perpetual preferred stock – 750,000 shares authorized, no shares issued or outstanding as of march 31, 2008 or december 31, 2007
                                                                                          
        series common stock – 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of march 31, 2008 or december 31, 2007
                                                                                          
        common stock – 0.01 per share par value; 800,000,000 shares authorized, 274,234,731 shares issued and 271,201,232 shares outstanding as of march 31, 2008 and 272,911,564 shares issued and 270,066,621 shares outstanding as of december 31, 2007
                                                                             2,742,000             
        treasury shares, at cost: 3,033,499 shares as of march 31, 2008 and 2,844,943 shares as of december 31, 2007
                                                                             -118,486,000             
        current assets of discontinued operations
                                                                              74,093,000            
        goodwill
                                                                               242,406,000 242,406,000 240,667,000 240,667,000        
        noncurrent assets of discontinued operations
                                                                                          
        current liabilities of discontinued operations
                                                                              180,356,000            
        noncurrent liabilities of discontinued operations
                                                                              33,236,000            
        minority interests, including 16,153 of discontinued operations at december 31, 2006
                                                                              701,000            
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of december 31, 2007 or 2006
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of december 31, 2007 or 2006
                                                                                          
        perpetual preferred stock — 750,000 shares authorized, no shares issued or outstanding as of december 31, 2007 or 2006
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of december 31, 2007 or 2006
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 272,911,564 shares issued and 270,066,621 shares outstanding as of december 31, 2007 and 800,000,000 shares authorized, 266,554,157 shares issued and 263,846,839 shares outstanding as of december 31, 2006
                                                                              2,729,000            
        treasury shares, at cost: 2,844,943 shares as of december 31, 2007 and 2,707,318 shares as of december 31, 2006
                                                                              -108,043,000            
        workers’ compensation obligations
                                                                               234,366,000 233,029,000 232,814,000 233,407,000  239,822,000 238,434,000 237,574,000 233,127,000 230,044,000 228,117,000 
        preferred stock – 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of september 30, 2007 or december 31, 2006
                                                                                          
        series a junior participating preferred stock – 1,500,000 shares authorized, no shares issued or outstanding as of september 30, 2007 or december 31, 2006
                                                                                          
        perpetual preferred stock – 750,000 shares authorized, no shares issued or outstanding as of september 30, 2007 or december 31, 2006
                                                                                          
        series common stock – 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of september 30, 2007 or december 31, 2006
                                                                                          
        common stock – 0.01 per share par value; 800,000,000 shares authorized, 268,214,559 shares issued and 265,505,673 shares outstanding as of september 30, 2007 and 266,554,157 shares issued and 263,846,839 shares outstanding as of december 31, 2006
                                                                               2,682,000           
        treasury shares, at cost: 2,708,886 shares as of september 30, 2007 and 2,707,318 shares as of december 31, 2006
                                                                               -103,763,000           
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of june 30, 2007 or december 31, 2006
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of june 30, 2007 or december 31, 2006
                                                                                          
        perpetual preferred stock — 750,000 shares authorized, no shares issued or outstanding as of june 30, 2007 or december 31, 2006
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of june 30, 2007 or december 31, 2006
                                                                                          
        common stock — 0.01 per share par value; 800,000,000 shares authorized, 268,112,377 shares issued and 265,403,491 shares outstanding as of june 30, 2007 and 266,554,157 shares issued and 263,846,839 shares outstanding as of december 31, 2006
                                                                                2,681,000          
        treasury shares, at cost: 2,708,886 shares as of june 30, 2007 and 2,707,318 shares as of december 31, 2006
                                                                                -103,763,000          
        preferred stock – 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of march 31, 2007 or december 31, 2006
                                                                                          
        series a junior participating preferred stock – 1,500,000 shares authorized, no shares issued or outstanding as of march 31, 2007 or december 31, 2006
                                                                                          
        perpetual preferred stock – 750,000 shares authorized, no shares issued or outstanding as of march 31, 2007 or december 31, 2006
                                                                                          
        series common stock – 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of march 31, 2007 or december 31, 2006
                                                                                          
        common stock – 0.01 per share par value; 800,000,000 shares authorized, 267,508,156 shares issued and 264,800,253 shares outstanding as of march 31, 2007 and 266,554,157 shares issued and 263,846,839 shares outstanding as of december 31, 2006
                                                                                 2,675,000         
        treasury shares, at cost: 2,707,903 shares as of march 31, 2007 and 2,707,318 shares as of december 31, 2006
                                                                                 -103,714,000         
        property, plant, equipment and mine development — at cost
                                                                                          
        payables and notes payable to affiliates
                                                                                   1,700,096       
        property, plant, equipment and mine development, net of accumulated depreciation, depletion and amortization of 1,836,858 at june 30, 2006 and 1,627,856 at december 31, 2005
                                                                                    5,511,559,000      
        preferred stock – 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of june 30, 2006 or december 31, 2005 series a junior participating preferred stock - 1,500,000 shares authorized as a subset of the preferred stock, no shares issued or outstanding as of june 30, 2006 or december 31, 2005
                                                                                          
        series common stock – 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of june 30, 2006 or december 31, 2005
                                                                                          
        common stock – 0.01 per share par value; 800,000,000 shares authorized, 265,924,011 shares issued and 265,151,651 shares outstanding as of june 30, 2006 and 400,000,000 shares authorized, 263,879,762 shares issued and 263,357,402 shares outstanding as of december 31, 2005
                                                                                    2,661,000      
        treasury shares, at cost: 772,360 shares as of june 30, 2006 and 522,360 shares as of december 31, 2005
                                                                                    -15,392,000      
        property, plant, equipment and mine development, net of accumulated depreciation, depletion and amortization of 1,745,883 at march 31, 2006 and 1,627,856 at december 31, 2005
                                                                                     5,385,171,000     
        preferred stock – 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of march 31, 2006 or december 31, 2005
                                                                                          
        series common stock – 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of march 31, 2006 or december 31, 2005
                                                                                          
        series a junior participating preferred stock - 1,500,000 shares authorized, no shares issued or outstanding as of march 31, 2006 or december 31, 2005
                                                                                          
        common stock – 0.01 per share par value; 400,000,000 shares authorized, 265,301,255 shares issued and 264,528,895 shares outstanding as of march 31, 2006 and 400,000,000 shares authorized, 263,879,762 shares issued and 263,357,402 shares outstanding as of december 31, 2005
                                                                                     2,650,000     
        treasury shares, at cost: 772,360 shares as of march 31, 2006 and 522,360 shares as of december 31, 2005
                                                                                     -15,392,000     
        unearned restricted stock awards
                                                                                      -5,943,000 -6,323,000 -6,703,000 -7,083,000 
        accounts receivables
                                                                                       236,538,000 204,419,000 187,464,000 
        property, plant, equipment and mine development, net of accumulated depreciation, depletion and amortization of 1,543,759 at september 30, 2005 and 1,333,645 at december 31, 2004
                                                                                       5,014,029,000   
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of september 30, 2005 or december 31, 2004
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of september 30, 2005 or december 31, 2004
                                                                                          
        series a junior participating preferred stock — 1,500,000 shares authorized, no shares issued or outstanding as of september 30, 2005 or december 31, 2004
                                                                                          
        common stock — 0.01 per share par value; 400,000,000 shares authorized, 131,676,733 shares issued and 131,415,553 shares outstanding as of september 30, 2005 and 150,000,000 shares authorized, 129,829,134 shares issued and 129,567,954 shares outstanding as of december 31, 2004
                                                                                       1,316,000   
        treasury shares, at cost: 261,180 shares as of september 30, 2005 and december 31, 2004
                                                                                       -3,916,000   
        property, plant, equipment and mine development, net of accumulated depreciation, depletion and amortization of 1,474,006 at june 30, 2005 and 1,333,645 at december 31, 2004
                                                                                        4,883,277,000  
        preferred stock — 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of june 30, 2005 or december 31, 2004
                                                                                          
        series common stock — 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of june 30, 2005 or december 31, 2004
                                                                                          
        common stock — 0.01 per share par value; 400,000,000 shares authorized, 131,201,979 shares issued and 130,940,799 shares outstanding as of june 30, 2005 and 150,000,000 shares authorized, 129,829,134 shares issued and 129,567,954 shares outstanding as of december 31, 2004
                                                                                        1,312,000  
        treasury shares, at cost: 261,180 shares as of june 30, 2005 and december 31, 2004
                                                                                        -3,916,000  
        property, plant, equipment and mine development, net of accumulated depreciation, depletion and amortization of 1,403,975 at march 31, 2005 and 1,333,645 at december 31, 2004
                                                                                         4,894,779,000 
        preferred stock – 0.01 per share par value; 10,000,000 shares authorized, no shares issued or outstanding as of march 31, 2005 or december 31, 2004
                                                                                          
        series common stock – 0.01 per share par value; 40,000,000 shares authorized, no shares issued or outstanding as of march 31, 2005 or december 31, 2004
                                                                                          
        common stock – 0.01 per share par value; 150,000,000 shares authorized, 130,963,662 shares issued and 130,702,482 shares outstanding as of march 31, 2005 and 150,000,000 shares authorized, 129,829,134 shares issued and 129,567,954 shares outstanding as of december 31, 2004
                                                                                         1,310,000 
        treasury shares, at cost: 261,180 shares as of march 31, 2005 and december 31, 2004
                                                                                         -3,916,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-04-02 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 
                                                                                            
          cash flows from operating activities
                                                                                            
          net income
        -25,600,000 12,400,000 -66,900,000 -26,000,000 38,000,000 37,800,000 111,500,000 209,200,000 45,000,000 198,700,000 131,300,000 202,800,000 282,800,000 645,500,000 383,600,000     -79,700,000 -127,600,000 -67,100,000 -1,547,600,000 -131,500,000 -276,400,000 -78,100,000 39,500,000 129,900,000 260,600,000 79,800,000 116,400,000 207,000,000 364,600,000 230,000,000 -28,200,000 126,900,000         -513,000,000 -149,000,000   -561,200,000 -19,100,000 87,100,000 -19,400,000 -1,002,800,000 41,600,000 207,800,000 178,300,000 193,900,000 281,500,000 292,200,000 178,700,000 215,000,000 236,300,000 214,200,000 136,700,000 95,000,000 110,800,000 82,000,000 175,200,000 293,300,000 369,600,000 233,435,000 57,165,000 35,815,000 32,272,000 107,692,000 88,506,000 175,033,000 142,008,000 153,434,000 130,222,000 162,169,000 113,340,000 95,254,000 51,890,000 
          loss from discontinued operations, net of income taxes
        200,000 -800,000 300,000 400,000 300,000 500,000 1,000,000 1,600,000 700,000  -2,500,000 1,300,000 1,300,000  800,000 700,000 800,000 -24,300,000   7,200,000 2,300,000 2,300,000 2,200,000  3,800,000 3,400,000 3,400,000 -27,100,000 4,100,000 3,600,000 1,300,000 13,400,000 3,700,000  4,100,000  38,100,000 3,000,000 3,400,000  157,500,000 36,300,000 8,900,000  -5,000,000 -800,000 -200,000    9,100,000  81,200,000 7,500,000 4,000,000  2,000,000 800,000 900,000 700,000 1,300,000 500,000 400,000 18,500,000 5,400,000 5,700,000 -34,700,000                 
          income from continuing operations, net of income taxes
        -25,400,000 11,600,000 -66,600,000 -25,600,000 38,300,000 38,300,000 112,500,000 210,800,000 45,700,000 199,000,000 128,800,000 204,100,000 284,100,000 641,500,000 384,400,000     -77,700,000 -120,400,000 -64,800,000 -1,545,300,000 -129,300,000 -290,200,000 -74,300,000 42,900,000 133,300,000 233,500,000 83,900,000 120,000,000 208,300,000 378,000,000 233,700,000 -29,600,000 131,000,000         -478,800,000 -154,000,000   -401,100,000 24,000,000 101,400,000 -10,300,000 -991,300,000 122,800,000 215,300,000 182,300,000 254,400,000 283,500,000 293,000,000 179,600,000 215,700,000 237,600,000 214,700,000 137,100,000 113,500,000 116,200,000 87,700,000 140,500,000                 
          adjustments to reconcile income from continuing operations, net of income taxes to net cash from operating activities:
                                                                                            
          depreciation, depletion and amortization
        109,500,000 99,000,000 100,000,000 93,400,000 92,100,000 95,600,000 84,700,000 82,900,000 79,800,000 82,200,000 82,300,000 80,600,000 76,300,000 90,200,000 80,700,000 73,800,000 72,900,000 77,900,000 77,100,000 68,300,000 79,500,000 72,200,000 88,300,000 106,000,000 121,600,000 141,500,000 165,400,000 172,500,000 175,900,000 169,600,000 163,900,000 169,600,000 178,800,000 194,500,000 28,400,000 119,900,000 119,900,000 117,800,000 115,900,000 111,800,000 141,600,000 136,000,000 147,100,000 147,500,000 171,800,000 163,600,000 163,100,000 157,200,000 197,500,000 186,400,000 185,700,000 170,700,000 192,700,000 168,500,000 157,300,000 144,900,000 154,400,000 113,700,000 105,300,000 108,800,000 113,600,000 116,700,000 105,100,000 105,500,000 99,700,000 106,200,000 102,000,000 97,300,000 114,800,000 103,800,000 93,598,000 94,002,000 37,142,000 113,054,000 108,501,000 102,862,000 114,107,000 90,664,000 91,475,000 80,964,000 83,693,000 77,159,000 79,309,000 75,953,000 
          noncash interest expense
        1,400,000 1,400,000 900,000 1,700,000 1,600,000 1,400,000 800,000 1,900,000 1,300,000 600,000 700,000 1,700,000 1,600,000 4,100,000 4,600,000 5,200,000 3,800,000 4,400,000 5,900,000 4,900,000  4,000,000 4,000,000 4,000,000  300,000 5,600,000 5,500,000  3,200,000 5,000,000 3,100,000   3,700,000 500,000 31,300,000 13,700,000 9,400,000 6,900,000 7,700,000 7,700,000 7,900,000 7,300,000 5,900,000 6,000,000 5,800,000 5,900,000 4,500,000 16,400,000 5,500,000 5,600,000                                 
          deferred income taxes
        -22,800,000 -5,400,000 -8,900,000 1,500,000 -3,900,000 23,100,000 -29,600,000 10,200,000 8,500,000 11,100,000 6,800,000 19,000,000 46,000,000 -78,800,000 -1,400,000 5,000,000 -6,400,000 -21,200,000 -400,000 -400,000 27,700,000 600,000 2,900,000 -3,400,000 39,800,000 -100,000   18,000,000 17,000,000 -200,000 700,000 -101,200,000 3,200,000 3,400,000 -5,000,000 -47,600,000 28,000,000 -17,500,000 -49,400,000 -53,900,000 35,900,000 -86,000,000 -3,600,000 276,200,000 69,600,000 -44,000,000 -69,900,000 -172,800,000 -56,000,000 -157,500,000 -47,800,000 160,000,000 -47,200,000 -115,700,000 300,000  27,100,000 -1,400,000 23,400,000 -106,900,000 108,900,000 19,900,000 49,800,000 31,500,000 45,500,000 43,900,000 10,200,000 -1,100,000 -34,300,000 -26,425,000 28,925,000 -208,026,000 7,407,000 1,636,000 -2,461,000 -114,490,000 -23,649,000 -38,240,000 -12,864,000 -53,368,000 16,707,000 10,447,000 1,252,000 
          noncash share-based compensation
        5,400,000 4,900,000 3,600,000 2,600,000 2,700,000 1,600,000 1,600,000 2,100,000 2,000,000 1,800,000 1,700,000 1,700,000 1,700,000 1,800,000 1,200,000 3,400,000 2,000,000 1,700,000 2,100,000 1,800,000 3,600,000 3,800,000 3,900,000 2,200,000 8,100,000 8,600,000 10,000,000 11,600,000 9,300,000 9,100,000 8,400,000 8,100,000 7,700,000 7,100,000 5,100,000 1,900,000 3,900,000 3,800,000 2,700,000 2,400,000 8,200,000                                            
          net gain on disposals
        -11,700,000 -2,400,000 -5,300,000 -14,800,000 -5,200,000 -100,000 -100,000 -7,500,000 -2,100,000 -6,500,000 -1,400,000 -5,200,000 -1,900,000 -6,500,000 -5,000,000   -25,800,000 -3,000,000 600,000 -4,800,000 -2,500,000 200,000 -8,100,000 700,000 -1,100,000 -200,000 -1,500,000 1,600,000 -20,800,000 1,600,000 -30,600,000                                                     
          loss from equity affiliates
        5,700,000 4,200,000 2,600,000 900,000 6,700,000  2,100,000 1,300,000 3,700,000       -48,700,000 -44,700,000 -15,800,000   34,400,000 10,600,000 6,000,000 9,100,000         -22,800,000 -10,500,000  -15,000,000  2,900,000 700,000 9,000,000  5,300,000 3,900,000 3,100,000  15,800,000 21,600,000 6,600,000    17,600,000  21,200,000 6,600,000 22,700,000  3,200,000 2,800,000 3,000,000 3,800,000 2,700,000 -6,400,000 1,600,000 46,400,000 12,000,000 6,600,000 4,100,000                 
          unrealized gains on foreign currency option contracts
        -300,000                                                                                    
          changes in current assets and liabilities:
                                                                                            
          accounts receivable
        11,900,000 -20,700,000 18,200,000 -33,200,000 84,500,000 -60,100,000 109,300,000 -74,100,000 46,800,000 -38,200,000 -22,700,000 78,500,000 70,800,000 -39,100,000 104,000,000 -173,000,000 -6,900,000 -25,200,000 -82,900,000 77,000,000 -52,000,000 -1,500,000 73,900,000 64,200,000 -36,000,000 98,100,000 15,300,000 5,500,000 -5,500,000 72,900,000 -12,700,000 117,100,000 -121,200,000 -34,500,000 -243,700,000 159,300,000 -125,700,000 -10,000,000 -91,400,000 125,800,000 -2,000,000 11,900,000 62,000,000 116,100,000 -86,600,000 42,200,000 52,300,000 47,500,000 50,100,000 62,500,000 -85,300,000 77,500,000 26,300,000 165,500,000 -168,100,000 261,600,000  68,200,000 -163,100,000 82,400,000                         
          inventories
        -22,300,000 22,000,000 12,400,000 400,000 -24,600,000 51,000,000 -22,200,000 -17,800,000 -52,600,000 200,000 -39,100,000 14,600,000 -35,400,000 -18,700,000 -24,500,000 16,200,000 -42,400,000 7,900,000 14,400,000 14,800,000 79,400,000 -38,700,000 -32,500,000 62,400,000 -38,200,000 27,400,000 -53,600,000 11,100,000 35,800,000 13,500,000 -24,300,000 25,200,000 17,300,000 5,900,000 -12,800,000 -47,200,000 56,200,000 44,100,000 11,700,000 -8,000,000 41,000,000 47,700,000 -30,000,000 37,500,000 84,400,000 62,200,000 1,000,000 -42,700,000 54,900,000 18,400,000 -10,100,000 -23,300,000 4,500,000 24,700,000 -63,300,000 -78,800,000  23,600,000 -11,100,000 -30,000,000 63,500,000 -32,900,000 -20,200,000 -18,100,000 32,100,000 88,800,000 -120,500,000 -49,300,000 -2,600,000 21,200,000 -49,146,000 17,546,000 -33,848,000 18,476,000 -45,889,000 -2,179,000  -14,327,000 7,933,000 -29,918,000  -5,870,000 -18,381,000 -21,953,000 
          other current assets
        -12,700,000 -14,600,000 14,000,000 -13,700,000 37,400,000 -20,900,000 -2,800,000 4,800,000 13,600,000 -29,200,000 -13,300,000 -100,000 43,500,000 11,300,000 42,300,000 -2,900,000 -80,000,000 8,400,000 -21,100,000 1,600,000 20,700,000 13,600,000 -30,800,000 17,500,000 -8,300,000 4,700,000 -28,900,000 -3,100,000 5,600,000 2,000,000 -12,600,000 -25,600,000 -27,800,000 -6,300,000 -17,200,000 100,000 4,200,000 4,800,000 2,600,000 -36,000,000 7,200,000 11,200,000 -3,700,000 100,000 3,300,000 6,100,000 3,800,000 -5,500,000 -7,900,000 -2,600,000 6,500,000 7,100,000 -32,400,000 18,300,000 18,200,000 6,200,000  -23,400,000 -9,500,000 -8,700,000 -47,900,000 200,000 15,500,000 3,700,000 -18,600,000 43,700,000 -40,300,000 11,900,000 -3,100,000 23,700,000 -30,333,000 11,433,000 -21,561,000 -24,079,000 -13,162,000 2,343,000  -11,852,000 1,102,000 -15,708,000  -15,814,000 853,000 -3,664,000 
          accounts payable and accrued expenses
        -3,100,000 10,600,000 59,900,000 29,500,000 -89,700,000 13,400,000 35,700,000 -64,500,000 -169,500,000 149,400,000 -5,900,000 16,300,000 -39,600,000 129,600,000 -48,500,000 15,300,000 -28,400,000 92,700,000 -34,800,000 -15,400,000 -56,100,000 -2,400,000 -8,800,000 -125,100,000 -3,100,000 -62,400,000 -22,100,000 -30,600,000 -121,200,000 1,100,000 2,400,000 -42,500,000 91,500,000 -142,000,000 -64,100,000 -54,900,000 151,300,000 21,900,000 54,400,000 -71,100,000 -59,700,000 -44,100,000 -99,000,000 -178,900,000 -105,400,000 63,000,000 -33,900,000 47,100,000 -87,000,000 -21,200,000 -42,400,000 41,700,000 -201,700,000 252,600,000 -59,300,000 -108,700,000  -20,400,000 103,200,000 -91,400,000 114,800,000 171,600,000 29,000,000 -92,100,000 22,700,000 42,600,000 -64,700,000 -124,400,000 -8,600,000 168,300,000 65,726,000 74,000 7,105,000 162,824,000 -104,481,000 -8,576,000  72,551,000 -4,696,000 -97,991,000  61,442,000 19,987,000 37,800,000 
          collateral arrangements
        -500,000 -1,700,000 -300,000 -4,900,000 -400,000 5,800,000 -6,300,000 -1,700,000 151,300,000 -53,700,000 -29,000,000 -71,000,000 -45,900,000 -16,500,000 -8,600,000 500,000 -28,700,000 300,000 -5,300,000         109,100,000 214,000,000                                                     
          asset retirement obligations
        1,600,000 -21,500,000 1,300,000 3,700,000 1,300,000 -3,300,000 1,500,000 -3,100,000 400,000 -14,200,000 300,000 1,100,000 2,500,000 -28,300,000 800,000 500,000 4,700,000 3,400,000 5,900,000 8,100,000 10,300,000 5,300,000 500,000 6,400,000 -2,500,000 -200,000 3,800,000 5,500,000 -3,800,000 300,000 2,200,000 7,000,000 4,500,000 3,000,000 -5,600,000 10,200,000 -5,900,000 4,800,000 5,200,000 9,000,000 -4,200,000 7,600,000 9,200,000 11,300,000 31,900,000 8,900,000 10,000,000 9,500,000 10,500,000 8,700,000 13,600,000 12,700,000 -9,200,000 29,600,000 12,600,000 13,400,000  7,300,000 13,000,000 7,500,000 12,200,000 5,900,000 7,700,000 6,700,000 4,500,000 7,800,000 6,900,000 8,500,000 10,000,000   6,611,000 9,497,000 -505,000 588,000 5,563,000 5,424,000 -7,030,000 1,532,000 22,000 3,101,000 -3,363,000 -2,253,000 1,534,000 
          postretirement benefit obligations
        -3,300,000 -17,400,000 -11,700,000 -11,500,000 -11,400,000 -29,500,000 -14,900,000 -14,700,000 -15,400,000 -15,600,000 -15,900,000 -16,000,000 -14,400,000 -60,800,000 -16,300,000 -16,300,000 -15,900,000 -14,600,000 -15,900,000 -13,400,000 -6,000,000 8,700,000 -6,900,000 -7,900,000 74,600,000 -6,600,000 -25,000,000 -6,200,000 -144,500,000 -3,500,000 -500,000 -2,600,000                                                     
          pension obligations
        400,000 -900,000 900,000 -4,900,000     -2,200,000 200,000 300,000 400,000 20,300,000 -500,000 -600,000 -600,000 -600,000 -4,000,000 2,800,000 -28,700,000 100,000 100,000 100,000 -15,600,000 1,000,000 -18,900,000 1,000,000 1,900,000 -22,200,000 -14,300,000 -32,300,000                                                     
          other
        -3,200,000 -800,000 -2,100,000 300,000 700,000 700,000 -7,600,000 1,200,000 1,100,000   600,000 -800,000 200,000 100,000 3,200,000    4,700,000 -2,000,000 -2,800,000 200,000 16,000,000 900,000 -4,800,000 -10,000,000 5,400,000 4,700,000 600,000 5,300,000 -11,100,000 -12,700,000 -3,600,000 -2,500,000 18,000,000 -37,300,000 21,000,000 -9,100,000 -5,300,000 -2,600,000 -19,300,000 6,300,000 -13,100,000 11,700,000 -3,700,000 -5,600,000 -17,500,000 8,700,000 2,300,000 -14,800,000 31,100,000 -34,700,000 28,800,000 800,000  -41,600,000 23,200,000 -900,000 25,600,000 -900,000 3,600,000 -12,900,000 300,000 2,000,000 -7,600,000 -3,400,000 34,200,000 -1,600,000 -4,321,000 -3,579,000 3,797,000 -12,999,000 3,636,000 7,479,000 24,999,000 -9,928,000 9,386,000 -17,869,000 10,988,000 8,302,000 4,728,000 4,418,000 
          net cash from continuing operations
        30,600,000 69,200,000 122,500,000 23,800,000 120,500,000 121,400,000 361,400,000 9,700,000 120,300,000 283,600,000 87,500,000 355,800,000 389,400,000 671,400,000 496,800,000 284,600,000 -272,500,000 18,500,000 -92,100,000 74,100,000 24,700,000 23,000,000 -31,100,000 -1,600,000 127,600,000 179,200,000 197,800,000 200,800,000 233,100,000 364,600,000 338,500,000 580,700,000 471,300,000 253,400,000 -155,300,000 246,600,000 235,000,000 169,700,000 11,300,000 -438,900,000 80,900,000 -9,600,000 -57,600,000 5,200,000 95,200,000 188,700,000 30,200,000 126,900,000 202,500,000 211,700,000 78,400,000 287,500,000 226,100,000 644,000,000 298,300,000 431,400,000  575,900,000 397,400,000 220,800,000 208,600,000 428,800,000 295,700,000 170,600,000 389,300,000 441,600,000 2,800,000 219,800,000 630,900,000 462,000,000 232,910,000 88,090,000             
          net cash from discontinued operations
        -600,000 -600,000 -500,000 -600,000 -600,000 -1,600,000 -1,500,000 -1,900,000 -1,300,000 -1,200,000 -74,100,000 -2,400,000 -3,100,000 -1,900,000 -2,100,000 -1,500,000 -1,200,000 -14,100,000 -1,700,000 -3,100,000 -2,300,000 -2,000,000 -17,300,000 -3,100,000 -2,800,000 -3,600,000 -18,400,000 -3,200,000 -4,200,000 -19,200,000 -2,800,000 -1,000,000 -4,400,000 -13,800,000 7,600,000 -8,200,000 -11,000,000 -14,700,000 -4,100,000 -100,000 -4,700,000 -24,600,000 -2,200,000 -1,800,000 -8,700,000 -13,900,000 -9,000,000 -72,800,000 -24,100,000 900,000 -18,700,000 -15,800,000 -2,500,000 -28,000,000 -18,300,000 -35,900,000  -1,000,000 -2,400,000 -200,000 -5,300,000 -1,400,000 -3,300,000 -6,600,000 600,000 -13,000,000 36,400,000 -29,600,000 -37,700,000 -33,800,000 -27,541,000 -29,159,000             
          net cash from operating activities
        30,000,000 68,600,000 122,000,000 23,200,000 119,900,000 119,800,000 359,900,000 7,800,000 119,000,000 282,400,000 13,400,000 353,400,000 386,300,000 669,500,000 494,700,000 283,100,000 -273,700,000 4,400,000 -93,800,000 71,000,000 22,400,000 21,000,000 -48,400,000 -4,700,000 124,800,000 175,600,000 179,400,000 197,600,000 228,900,000 345,400,000 335,700,000 579,700,000 466,900,000 239,600,000 -147,700,000 238,400,000 224,000,000 155,000,000 7,200,000 -439,000,000 76,200,000 -34,200,000 -59,800,000 3,400,000 86,500,000 174,800,000 21,200,000 54,100,000 178,400,000 212,600,000 59,700,000 271,700,000 223,600,000 616,000,000 280,000,000 395,500,000  574,900,000 395,000,000 220,600,000 203,300,000 427,400,000 292,400,000 164,000,000 389,900,000 428,600,000 39,200,000 190,200,000 593,200,000 428,200,000 205,369,000 58,931,000 -176,975,000 266,800,000 -20,433,000 246,973,000  220,893,000 164,353,000 49,052,000  168,575,000 155,667,000 97,927,000 
          capital expenditures
        -85,400,000 -130,600,000 -116,200,000 -94,200,000 -70,400,000 -135,600,000 -98,700,000 -105,600,000 -61,400,000 -68,100,000 -66,600,000 -55,700,000 -41,400,000 -33,400,000 -29,700,000 -29,700,000 -43,600,000 -50,300,000 -59,500,000 -46,100,000 -54,500,000 -31,300,000 -86,000,000 -61,000,000 -35,800,000 -114,500,000 -60,900,000 -71,900,000 -53,700,000 -98,000,000 -22,700,000 -13,100,000 -32,800,000 -70,000,000 -18,500,000 -24,800,000 -13,300,000 -49,900,000 -26,000,000 -25,800,000 -25,100,000 -86,900,000 -42,800,000 -40,300,000 -24,400,000 -99,700,000 -62,200,000 -92,500,000 -74,000,000 -253,900,000 -304,500,000 -192,300,000 -235,300,000  -261,400,000 -247,600,000 -107,200,000 -265,700,000 -103,800,000 -99,100,000 -88,400,000 -116,700,000 -61,700,000 -46,500,000 -35,700,000 -92,100,000 -64,200,000 -50,609,000 -59,291,000 -41,571,000 -140,547,000 -153,663,000 -134,653,000  -92,309,000 -112,676,000 -87,459,000  -159,053,000 -77,160,000 -110,490,000 
          free cash flows
        -55,400,000 -62,000,000 5,800,000 -71,000,000 49,500,000 -15,800,000 261,200,000 -97,800,000 57,600,000 282,400,000 -54,700,000 286,800,000 330,600,000 669,500,000 453,300,000 249,700,000 -303,400,000 -25,300,000 -137,400,000 20,700,000 -37,100,000 -25,100,000 -102,900,000 -36,000,000 124,800,000 89,600,000 118,400,000 161,800,000 114,400,000 284,500,000 263,800,000 526,000,000 368,900,000 216,900,000 -160,800,000 205,600,000 154,000,000 136,500,000 -17,600,000 -452,300,000 26,300,000 -60,200,000 -85,600,000 -21,700,000 -400,000 132,000,000 -19,100,000 29,700,000 78,700,000 150,400,000 -32,800,000 197,700,000 -30,300,000 311,500,000 87,700,000 160,200,000  313,500,000 147,400,000 113,400,000 -62,400,000 323,600,000 193,300,000 75,600,000 273,200,000 366,900,000 -7,300,000 154,500,000 501,100,000 364,000,000 154,760,000 -360,000 -218,546,000 126,253,000 -174,096,000 112,320,000  128,584,000 51,677,000 -38,407,000  9,522,000 78,507,000 -12,563,000 
          peabody energy corporation
                                                                                            
          unaudited condensed consolidated statements of cash flows -
                                                                                            
          cash flows from investing activities
                                                                                            
          additions to property, plant, equipment and mine development
        -85,400,000 -130,600,000 -116,200,000 -94,200,000 -70,400,000 -135,600,000 -98,700,000 -105,600,000 -61,400,000  -68,100,000 -66,600,000 -55,700,000  -41,400,000 -33,400,000 -29,700,000 -29,700,000 -43,600,000 -50,300,000 -59,500,000 -46,100,000 -54,500,000 -31,300,000  -86,000,000 -61,000,000 -35,800,000 -114,500,000 -60,900,000 -71,900,000 -53,700,000 -98,000,000 -22,700,000 -13,100,000 -32,800,000 -70,000,000 -18,500,000 -24,800,000 -13,300,000 -49,900,000 -26,000,000 -25,800,000 -25,100,000 -86,900,000 -42,800,000 -40,300,000 -24,400,000 -99,700,000 -62,200,000 -92,500,000 -74,000,000 -253,900,000 -304,500,000 -192,300,000 -235,300,000  -261,400,000 -247,600,000 -107,200,000 -265,700,000 -103,800,000 -99,100,000 -88,400,000 -116,700,000 -61,700,000 -46,500,000 -35,700,000 -92,100,000 -64,200,000 -50,609,000 -59,291,000 -41,571,000 -140,547,000 -153,663,000 -134,653,000 -185,277,000 -92,309,000 -112,676,000 -87,459,000 -37,601,000 -159,053,000 -77,160,000 -110,490,000 
          changes in accrued expenses related to capital expenditures
        -37,100,000 24,600,000 7,400,000 -3,400,000 -38,600,000 5,300,000 7,200,000 -6,900,000 -6,800,000  300,000 -3,800,000 -1,600,000  1,400,000 -2,700,000 -7,000,000 800,000 7,300,000 -11,400,000 8,800,000 -600,000 -2,900,000 -11,400,000  -5,800,000 4,000,000 -3,800,000 7,100,000 -6,100,000 4,000,000 -4,900,000 14,400,000 200,000 3,000,000 -1,400,000 -600,000 1,600,000 -3,700,000 -3,400,000 5,300,000 -1,300,000 -1,900,000 -11,300,000 6,200,000 -5,300,000 800,000 -18,300,000 -18,100,000 -36,200,000 -66,400,000                                 
          proceeds from disposal of assets, net of receivables
        5,400,000 15,900,000 4,100,000 5,300,000 7,200,000 1,000,000 600,000 13,100,000 2,400,000  1,900,000 9,100,000 2,900,000  7,200,000 19,800,000 3,600,000 7,800,000 4,000,000 900,000 11,700,000 3,400,000 1,500,000 10,500,000  11,800,000 4,800,000 11,000,000    23,000,000                                                     
          contributions to joint ventures
        -165,600,000 -165,700,000 -144,900,000 -153,000,000 -138,300,000 -177,900,000 -176,600,000 -170,700,000 -202,800,000  -202,600,000 -164,600,000 -206,200,000  -199,100,000 -149,400,000 -126,600,000 -119,300,000 -108,400,000 -136,100,000 -67,800,000 -83,200,000 -95,700,000 -96,300,000  -106,800,000 -101,200,000 -118,400,000 -117,100,000 -114,400,000 -120,300,000 -123,500,000 -95,800,000 -113,700,000 -900,000 -95,400,000 -67,800,000 -82,000,000 -78,000,000 -81,700,000 -75,600,000 -110,000,000 -125,200,000 -114,600,000 -119,400,000 -139,100,000 -119,500,000 -151,800,000 -131,900,000 -216,000,000 -169,700,000 -154,100,000 -292,800,000 -155,600,000 -166,700,000 -208,900,000                             
          distributions from joint ventures
        160,200,000 162,800,000 148,300,000 155,900,000 150,800,000 167,400,000 189,200,000 167,400,000 193,200,000  213,600,000 163,800,000 202,000,000  184,400,000 132,600,000 148,200,000 97,700,000 150,200,000 102,400,000 59,300,000 82,800,000 89,800,000 98,400,000  111,200,000 94,600,000 110,900,000 128,700,000 118,200,000 116,100,000 120,700,000 99,000,000 112,500,000 5,000,000 90,500,000 75,700,000 73,200,000 76,100,000 87,400,000 82,800,000 103,100,000 123,100,000 113,600,000 125,700,000 139,500,000 130,800,000 138,200,000 146,300,000 204,500,000 197,800,000 174,300,000 295,300,000 143,400,000 162,900,000 221,400,000                             
          net cash from investing activities
        -123,500,000 -93,800,000 -72,100,000 -91,100,000 -89,600,000 -208,500,000 -72,800,000 -241,600,000 -75,200,000  -54,600,000 -61,500,000 -58,500,000  -33,400,000 59,300,000 35,200,000 -37,100,000 10,600,000 -93,200,000 -47,300,000 -43,800,000 -78,500,000 -37,100,000  -83,600,000 -25,900,000 -38,100,000 -451,800,000 -47,500,000 -11,600,000 -6,400,000 -58,500,000 -16,400,000 -33,600,000 15,100,000 -44,400,000 -265,400,000 78,600,000 -12,900,000 -143,700,000 -110,200,000 -400,000 -35,700,000 -224,900,000 -138,000,000 8,700,000 39,700,000 -255,600,000 -153,900,000 -37,900,000 -68,300,000 -170,300,000 -405,900,000 -312,800,000 -203,100,000  -317,000,000 -228,600,000 -211,200,000 -280,300,000 -189,600,000 -121,000,000 -112,700,000 -130,000,000 -68,200,000 -102,300,000 -106,000,000 -47,000,000 -229,400,000 -121,006,000 -108,094,000 -85,652,000 -120,359,000 -188,111,000 -181,210,000  -428,572,000 -166,657,000 -182,588,000  -152,913,000 -67,772,000 -122,394,000 
          cash flows from financing activities
                                                                                            
          repayments of long-term debt
        -2,400,000 -2,300,000 -2,300,000 -4,800,000 -2,800,000 -3,200,000 -2,600,000 -2,400,000 -2,200,000  -2,100,000 -2,100,000 -2,700,000  -191,500,000 -54,900,000 -599,900,000 -50,500,000 -42,900,000 -40,200,000 -88,500,000 -71,100,000 -2,700,000 -7,200,000  -6,400,000 -9,200,000 -8,300,000 -12,000,000 -9,500,000 -55,300,000 -8,200,000 -209,700,000 -308,300,000 -21,700,000 -2,100,000  -2,200,000 -2,800,000 -6,200,000  -5,300,000 -88,500,000 -572,200,000  -5,200,000 -5,200,000 -5,200,000 -6,200,000 -1,168,400,000 -107,100,000 -108,500,000                                 
          payment of debt issuance and other deferred financing costs
         -100,000 -1,700,000 -900,000 -300,000 -10,800,000  -300,000  -400,000 -1,500,000 -19,200,000 -22,500,000      -5,600,000                                                           
          repurchase of employee common stock relinquished for tax withholding
        -3,300,000 -800,000 -700,000 -3,400,000  -500,000 -13,200,000  -600,000 -2,000,000 -700,000 -600,000 -800,000 -800,000  -10,900,000 -1,400,000                    -2,000,000 -200,000 -100,000 -200,000 -2,600,000 -100,000 -300,000 -100,000 -7,900,000  -700,000                           
          dividends paid
        -9,200,000 -9,000,000 -9,200,000 -9,200,000 -9,100,000 -9,100,000 -9,400,000 -9,400,000 -9,700,000  -9,900,000               -14,600,000 -14,900,000 -214,400,000 -15,000,000 -15,300,000 -14,300,000 -15,000,000          -700,000 -700,000  -23,100,000 -23,000,000 -23,100,000 -22,900,000 -22,900,000 -23,000,000 -22,900,000 -22,800,000 -22,800,000 -23,100,000 -23,200,000  -22,300,000 -23,800,000 -23,000,000 -22,900,000 -18,900,000 -18,800,000 -18,800,000 -18,700,000 -16,000,000 -16,100,000 -16,000,000 -16,000,000 -16,400,000 -16,240,000 -16,260,000 -15,949,000 -15,930,000 -15,898,000 -15,881,000 -15,828,000 -15,866,000 -15,893,000 -15,869,000 -12,494,000 -12,462,000 -9,807,000 -9,772,000 
          distributions to noncontrolling interests
        -7,700,000 -100,000 -8,100,000 -14,700,000 -16,300,000 -18,500,000  -36,100,000 -22,800,000  -3,700,000 -13,800,000 -3,800,000 -100,000 -3,400,000 -100,000  -9,000,000 -100,000 -14,300,000 -3,700,000 -6,600,000 -10,300,000 -6,300,000 -100,000  -1,400,000                            -7,200,000 -800,000 -1,300,000                 
          net cash from financing activities
        -22,600,000 -11,400,000 -28,900,000 -15,800,000 -29,100,000 -7,200,000 -128,300,000 -12,800,000 -127,700,000  -139,100,000 -186,400,000 -39,000,000  -195,600,000 -57,100,000 132,200,000 57,800,000 21,400,000 -63,300,000 -80,500,000   -7,900,000  -179,700,000 -93,000,000 -337,300,000 -162,100,000 -373,400,000 -284,600,000 -205,100,000 -321,300,000 -393,900,000 27,500,000 -57,700,000  3,900,000 442,900,000 936,200,000  -8,400,000 -89,800,000 371,400,000  -68,700,000 -39,600,000 -29,700,000 -30,100,000 -25,300,000 -133,400,000 -132,700,000 -142,500,000 -51,300,000 -430,400,000 -39,100,000  -33,200,000 -262,700,000 -31,400,000 4,700,000 -27,300,000 -39,800,000 -14,700,000 -61,900,000 -15,600,000 -17,600,000 -7,200,000 -200,500,000 -169,600,000 -92,131,000 86,431,000 91,592,000 -12,402,000 -4,508,000 -96,947,000  206,348,000 -29,120,000 -19,582,000  3,712,000 -9,753,000 16,056,000 
          net change in cash, cash equivalents and restricted cash
        -116,100,000 -36,600,000 21,000,000 -83,700,000 1,200,000 -95,900,000 158,800,000 -246,600,000 -83,900,000  -180,300,000 105,500,000 288,800,000  265,700,000 285,300,000 -106,300,000 25,100,000 -61,800,000 -85,500,000 -105,400,000 -33,900,000 166,000,000 -49,700,000  -87,700,000 60,500,000 -177,800,000 -385,000,000 -75,500,000 39,500,000 368,200,000                                                     
          cash, cash equivalents and restricted cash at beginning of period
        1,284,500,000 1,382,600,000 1,650,200,000  1,417,600,000  954,300,000 709,200,000 732,200,000  1,017,400,000 1,070,200,000                                                     
          cash, cash equivalents and restricted cash at end of period
        1,168,400,000 -36,600,000 21,000,000 -83,700,000 1,383,800,000 -95,900,000 158,800,000 -246,600,000 1,566,300,000  -180,300,000 105,500,000 1,706,400,000  265,700,000 285,300,000 848,000,000 25,100,000 -61,800,000 623,700,000 -105,400,000 -33,900,000 166,000,000 682,500,000  -87,700,000 60,500,000 839,600,000 -385,000,000 -75,500,000 39,500,000 1,438,400,000                                                     
          the following table provides a reconciliation of “cash, cash equivalents and restricted cash at beginning of period”:
                                                                                            
          cash and cash equivalents
        575,300,000 700,400,000 969,300,000  1,307,300,000  233,800,000           981,900,000 1,012,100,000                                                     
          restricted cash included in “restricted cash and collateral”
        709,200,000 682,200,000 680,900,000  110,300,000                                                                        
          the following table provides a reconciliation of “cash, cash equivalents and restricted cash at end of period”:
                                                                                            
          asset impairment
                 2,000,000 9,500,000       69,300,000   250,200,000           30,500,000 230,700,000 17,200,000 377,000,000                                          
          noncash provision for narm and shoal creek losses
                                                                                            
          noncash income from port and rail capacity assignment
               -200,000 -200,000 -9,200,000                                                                        
          net loss on early debt extinguishment
                  2,000,000 6,800,000  8,700,000 2,300,000 23,500,000                                                                    
          shoal creek insurance recovery
              92,900,000                                                                              
          unrealized losses on foreign currency option contracts
           -4,100,000 -4,300,000                                                                                
          wards well acquisition
                                                                                          
          deposit associated with terminated acquisition
                                                                                            
          returned deposit related to terminated acquisition
                                                                                           
          insurance proceeds attributable to shoal creek equipment losses
             5,300,000                                                                              
          proceeds from loan note related to terminated acquisition
                                                                                            
          repayment of loan note related to terminated acquisition
                                                                                           
          common stock repurchases
             -100,000,000 -83,100,000  -91,000,000               -144,200,000 -57,200,000 -98,800,000 -135,100,000 -325,100,000 -199,000,000 -175,500,000 -106,500,000                                                    
          excise taxes paid related to common stock repurchases
                                                                                          
          income from equity affiliates
                 2,800,000 -5,600,000 -2,300,000 -1,800,000       900,000       -9,700,000 -3,500,000 -3,700,000 -17,200,000 -25,200,000 -22,000,000                                      3,500,000 -3,745,000 -2,655,000 -5,018,000 -2,959,000 -4,324,000 -2,160,000 -4,720,000 -5,200,000 -6,680,000 -7,252,000 -555,000 -8,863,000 -11,487,000 -9,191,000 
          shoal creek insurance recovery attributable to equipment losses
                                                                                            
          foreign currency option contracts
             9,400,000 -3,700,000 -2,400,000 5,700,000 -7,300,000 500,000 -2,800,000 2,200,000 -2,100,000 1,400,000 6,300,000 -3,300,000 1,000,000 1,400,000 2,900,000 -7,800,000 -3,900,000 -2,200,000 900,000 1,700,000 1,100,000 1,300,000 1,100,000 1,200,000 1,500,000 4,400,000 2,000,000 4,300,000 4,200,000                                                   
          workers’ compensation obligations
             4,300,000 -800,000 -1,100,000 -100,000 2,500,000 -600,000 200,000 -900,000 1,600,000 -900,000 -1,000,000 -600,000  600,000 3,100,000 -800,000 300,000 -800,000 4,500,000 -400,000 100,000 800,000 -1,400,000 200,000 -900,000 300,000                       1,800,000  1,900,000   -14,500,000 1,700,000 1,400,000 2,500,000 1,000,000 600,000 900,000 500,000 7,800,000   88,000 1,600,000 1,398,000 276,000 -532,000 -2,347,000 490,000 1,388,000 860,000 4,447,000 3,083,000 1,927,000 1,933,000 
          deposit associated with planned acquisition
                                                                                            
          advances to investments
                                                                                            
          cash receipts from middlemount coal pty ltd and other investments
                                                                                            
          proceeds from long-term debt
                      545,000,000    15,000,000 60,000,000              1,000,000,000  7,800,000 475,000,000 947,000,000  975,700,000               650,000,000               2,139,545,000 440,000,000 750,000 275,000    
          proceeds from loan note related to planned acquisition
                                                                                            
          proceeds from common stock issuances, net of costs
                      222,000,000 112,100,000                                                                   
          loss (income) from discontinued operations, net of income taxes
                                                                                            
          noncash benefit from narm and shoal creek losses
                                                                                            
          net gain on early debt extinguishment
                         -16,000,000                                                                   
          noncash provision for narm and shoal creek loss
                                                                                            
          advances to related parties
                     -100,000   -200,000   -100,000 -16,200,000 -6,900,000  -8,000,000 -3,000,000 -1,500,000 -8,200,000 -1,000,000 -2,600,000 -2,000,000 1,100,000 -3,200,000 -500,000 -400,000 -17,100,000    -100,000    -14,000,000 -7,400,000 -9,200,000 -3,100,000 -2,600,000 -3,800,000 -12,600,000 -23,100,000 595,400,000 -115,800,000 -305,600,000 -322,000,000                             
          cash receipts from middlemount coal pty ltd and other related parties
                  900,000    11,000,000 96,700,000 47,200,000 5,800,000                                                                   
          provision for narm and shoal creek loss
                                                                                            
          (income) income from discontinued operations, net of income taxes
                                                                                            
          (income) income from equity affiliates
                                                                                            
          the following table provides a reconciliation of “cash, cash equivalents and restricted cash at end of period” at september 30, 2022
                                                                                            
          restricted cash included in “investments and other assets”
                      31,900,000           35,500,000                                                       
          the following table provides a reconciliation of “cash, cash equivalents and restricted cash at end of period” at june 30, 2022
                                                                                            
          net loss
                        -120,600,000 -35,300,000                    -133,700,000 -233,800,000 -165,100,000  -301,900,000 -1,043,500,000 -173,300,000    -44,100,000                                     
          loss from continuing operations, net of income taxes
                        -119,800,000 -59,600,000                    -95,600,000 -230,800,000 -161,700,000  -144,400,000 -1,007,200,000 -164,400,000    -44,300,000                                     
          adjustments to reconcile loss from continuing operations, net of income taxes to net cash from operating activities:
                                                                                            
          net loss on disposals
                        -4,900,000                                                                    
          income from discontinued operations, net of income taxes
                           2,000,000                                                                 
          noncash coal inventory revaluation
                           5,500,000 -21,400,000                                                              
          gain on early debt extinguishment
                           -3,500,000                                                                 
          cash receipts from middlemount coal pty ltd
                           2,300,000      13,600,000 1,100,000 25,600,000                                                        
          noncash interest expense including loss on early extinguishment of debt
                                                                                            
          provision for north goonyella equipment loss
                                 24,700,000 17,100,000                                                        
          gain on formation of united wambo joint venture
                                                                                            
          noncash reorganization items
                                    -12,800,000    10,000,000 -5,600,000 -300,000                                               
          federal coal lease expenditures
                                    -500,000    -500,000    -187,400,000    -187,300,000    -187,300,000    -28,600,000 -158,700,000           -63,800,000 -59,800,000 -55,100,000 -63,571,000 -59,829,000 -54,824,000 -63,540,000 -59,829,000 -54,824,000 -63,540,000 -59,829,000     
          insurance proceeds attributable to north goonyella equipment losses
                                                                                           
          amount attributable to acquisition of shoal creek mine
                                 -2,400,000                                                         
          investment in equity securities
                                                                                           
          see accompanying notes to unaudited condensed consolidated financial statements.
                                                                                            
          net cash from in financing activities
                                                                                            
          north goonyella insurance recovery
                                   -116,900,000                                                         
          fresh start noncash coal inventory revaluation
                                                                                            
          benefit from north goonyella equipment loss
                                                                                            
          reclassification from other comprehensive earnings for terminated hedge contracts
                                           27,600,000                                                 
          take-or-pay obligation settlement
                                           -5,500,000 -15,500,000                                             
          gain on voluntary employee beneficiary association settlement
                                                                                            
          settlement of hedge positions
                                                                                          
          change in receivable from accounts receivable securitization program
                                            -168,500,000 143,500,000 -85,000,000 65,000,000 15,000,000 5,000,000 -85,000,000 -45,000,000 55,000,000  -9,100,000   -75,000,000 -82,000,000 107,000,000 -75,000,000                             
          acquisition of shoal creek mine
                                                                                            
          payment of deferred financing costs
                                    -19,800,000   -4,700,000   -55,400,000  -300,000 -26,700,000 -2,800,000  -300,000 -28,400,000                                         
          restricted cash
                                    40,100,000 174,800,000 23,700,000 169,800,000 -94,100,000 -30,900,000 -15,100,000 20,500,000 -100,200,000                                             
          proceeds from disposal of assets
                                     16,400,000   12,700,000 2,700,000 -21,800,000 24,300,000                  80,900,000 8,000,000 4,600,000  2,500,000 4,100,000 5,500,000                  45,757,000 13,140,000 11,488,000 5,042,000 10,954,000 12,500,000 47,731,000 
          repurchases of employee common stock relinquished for tax withholding
                                                                                           
          repayments of loans from related parties
                                      34,900,000 35,300,000  8,700,000 -4,600,000 31,100,000          -800,000 700,000 1,500,000                                     
          net assets from coal trading activities
                                       -11,600,000 10,700,000 -2,100,000 1,000,000 -500,000 1,000,000 1,200,000 300,000 6,000,000 -9,900,000 -4,500,000 -9,100,000 -3,800,000 4,500,000 4,500,000 -13,400,000 -5,700,000 -42,500,000 -47,200,000 -19,300,000 25,300,000 -20,400,000 -15,800,000 129,800,000 31,600,000  91,300,000 53,200,000 -72,800,000 -108,800,000 4,400,000 1,000,000 -6,200,000 2,100,000 34,900,000 13,000,000 20,900,000 120,100,000 -73,200,000 -10,318,000 -79,582,000 -31,535,000 -19,123,000 -13,237,000 -13,736,000  -4,971,000 3,562,000 240,000  -134,000 6,206,000 1,372,000 
          restricted cash included in investments and other assets
                                       18,000,000                                                     
          purchases of debt and equity securities
                                                -6,200,000 -4,700,000 -10,600,000 -7,300,000         -22,900,000 500,000                               
          proceeds from sales and maturities of debt and equity securities
                                                56,700,000 6,500,000 17,000,000 10,100,000          11,400,000 24,500,000 3,100,000                             
          repayment of loans from related parties
                                                          3,400,000 14,800,000 -609,400,000 101,500,000 280,000,000 338,700,000                             
          successor notes issuance proceeds into escrow
                                           -1,000,000,000                                                 
          net change in cash and cash equivalents
                                        87,100,000 -170,700,000 -153,800,000 195,800,000  -106,500,000 528,700,000 484,300,000  -152,800,000 -150,000,000 339,100,000  -31,900,000 -9,700,000 64,100,000 -107,300,000 33,400,000 -111,600,000 70,700,000 -89,200,000 158,800,000 -463,200,000 153,300,000  224,700,000 -96,300,000 -22,000,000 -72,300,000 210,500,000 131,600,000 36,600,000 198,000,000 344,800,000                   
          cash and cash equivalents at beginning of year
                                                                                326,511,000         
          cash and cash equivalents at end of year
                                                                                -171,035,000 134,039,000 -213,052,000 295,327,000         
          noncash interest expense including loss on early debt extinguishment
                                                                                            
          net gain on disposal of assets
                                         -400,000 22,300,000 -22,800,000 -5,800,000 -1,900,000 -13,700,000 -1,800,000 -24,800,000 -7,900,000 -12,200,000 -100,000                                -36,649,000    -9,226,000   -16,452,000 -31,122,000 
          accrued postretirement benefit costs
                                         -500,000 -1,500,000 800,000 6,900,000 -400,000 -200,000 4,500,000 3,100,000 5,800,000 5,300,000 -3,100,000 3,400,000 5,700,000 3,600,000 7,000,000 1,200,000 5,000,000 3,800,000 11,200,000 9,200,000 11,200,000 7,300,000  7,600,000 12,700,000 6,300,000 4,700,000 5,200,000 7,800,000 5,400,000 2,100,000 -1,000,000 1,000,000 5,100,000 14,800,000   -671,000 -19,412,000 12,509,000 12,703,000 7,322,000 -2,249,000 3,920,000 6,911,000 5,360,000 13,552,000 3,469,000 -1,176,000 3,874,000 
          accrued pension costs
                                         -30,600,000 -7,500,000 5,400,000 5,300,000 4,900,000 6,100,000 5,400,000 8,500,000 6,200,000 7,300,000 7,600,000 13,700,000 4,700,000 4,500,000 5,400,000 14,700,000                                    
          cash and cash equivalents at beginning of period
                                         181,400,000 872,300,000  261,300,000  298,000,000  444,000,000  558,800,000  799,100,000  1,295,200,000  988,800,000  449,700,000  21,000 45,279,000      503,278,000  389,636,000 
          cash and cash equivalents at end of period
                                         -170,700,000 27,600,000 1,068,100,000  -106,500,000 528,700,000 745,600,000  -152,800,000 -150,000,000 637,100,000  -31,900,000 -9,700,000 508,100,000  33,400,000 -111,600,000 629,500,000  158,800,000 -463,200,000 952,400,000  224,700,000 -96,300,000 1,273,200,000  210,500,000 131,600,000 1,025,400,000  344,800,000 -80,700,000 526,700,000  29,200,000 -7,747,000 82,547,000      -1,331,000 -31,424,000 350,160,000  19,374,000 78,142,000 381,225,000 
          workers' compensation obligations
                                          1,900,000 -3,100,000                                                 
          unrealized gains on non-coal trading derivative contracts
                                               -25,000,000                                             
          (gain) income from equity affiliates
                                                                                            
          proceeds from disposal of assets, net of notes receivable
                                            9,700,000 18,700,000 113,900,000 2,100,000 30,800,000 15,700,000 21,800,000 2,100,000 51,200,000 13,300,000 39,400,000 99,800,000 45,000,000 9,400,000           9,500,000 3,600,000 1,700,000 4,400,000 6,400,000 12,100,000 30,900,000 4,500,000 36,500,000 8,200,000 4,351,000 23,749,000 -17,976,000 90,442,000 30,669,000 16,451,000         
          gain on veba settlement
                                             -68,100,000                                             
          reclassification from oci for terminated hedge contracts
                                                                                            
          gain on previously monetized foreign currency hedge positions
                                                                                            
          monetization of hedge positions
                                               -17,800,000                                             
          settlement charges related to the patriot bankruptcy
                                                                                            
          gains on previously monetized foreign currency hedge positions
                                                -100,000 -4,100,000 -10,700,000 -30,200,000 -31,900,000 -33,900,000 -40,900,000                                     
          maturity of short-term investments
                                                                 75,000,000                           
          restricted cash for distributions to noncontrolling interests
                                                                                            
          share-based compensation for equity- and liability-classified awards
                                                  4,000,000 9,600,000                                         
          share-based compensation
                                                    11,000,000 11,800,000 10,500,000 13,500,000 11,400,000 10,900,000 16,800,000 11,800,000 10,500,000 10,700,000 11,200,000 13,000,000  10,500,000 11,000,000 10,900,000 11,000,000 7,800,000 10,900,000 11,400,000 10,800,000                    
          asset impairment and mine closure costs
                                                                                            
          settlement charges related to the patriot bankruptcy reorganization
                                                                                            
          net gain on disposal or exchange of assets
                                                    -15,500,000 -13,900,000 -2,200,000 -9,800,000 -2,700,000 -4,100,000 -43,200,000 -2,600,000 -9,500,000 -200,000 -3,400,000 -4,000,000  -1,700,000 -25,700,000 -4,000,000 -14,600,000 -6,700,000 -1,400,000 -7,300,000 -7,000,000 -2,800,000 -10,100,000 -3,300,000 -5,100,000 -4,800,000 -3,585,000 -59,415,000 70,291,000 -23,610,000   -37,853,000 -35,040,000   -6,336,000    
          monetization of foreign currency hedge positions
                                                                                            
          investment in prairie state energy campus
                                                            -1,300,000 -2,700,000 -3,400,000 -3,300,000  -8,300,000 -12,600,000 -8,900,000 -23,500,000 -22,000,000 -18,300,000 -12,200,000 -15,200,000 -17,100,000 -11,900,000 -12,600,000                 
          purchases of short-term investments
                                                                 -100,000,000                         
          purchases of debt securities
                                                     -1,800,000 -2,200,000 -2,000,000  -200,000 -5,100,000 -4,600,000       -14,600,000                         
          proceeds from sales and maturities of debt securities
                                                     2,700,000 4,600,000 400,000  700,000 4,100,000 12,900,000                                 
          proceeds from the maturity of short-term investments
                                                                                           
          payment of debt issuance costs
                                                                   -10,300,000              -830,000 -31,990,000        
          accounts receivable securitization program
                                                                                            
          investments in equity affiliates and joint ventures
                                                                 -37,400,000 -1,300,000 -1,100,000 -1,400,000 -1,700,000 -15,700,000 -5,000,000   100,000 -100,000               
          acquisition of macarthur coal limited, net of cash acquired
                                                                                            
          common stock repurchase
                                                                          -141,500,000        1,000 -88,299,000 -11,476,000     
          excess tax benefits related to share-based compensation
                                                            4,700,000 -100,000 200,000 3,500,000  300,000 900,000 4,900,000                         
          acquisition of mcg coal holdings pty ltd noncontrolling interests
                                                                                          
          acquisition of peamcoal pty ltd noncontrolling interests
                                                                                            
          pension costs
                                                          12,900,000 12,900,000 8,100,000 1,200,000 12,400,000 12,400,000                             
          contributions to pension plans
                                                          -400,000 -400,000 -400,000 -400,000 -500,000 -400,000  -400,000 -500,000 -400,000 -88,700,000 -3,800,000 -3,600,000 -16,500,000 -1,000,000 -32,600,000 -4,100,000 -1,000,000 -1,100,000            -887,000 -3,886,000   
          proceeds from disposal of assets, net of note receivable
                                                           53,000,000                                 
          adjustments to reconcile income from continuing operations, net of income
                                                                                            
          taxes to net cash from operating activities:
                                                                                            
          proceeds from sales of debt and equity securities
                                                                                            
          proceeds from sale of short term investments
                                                                                            
          investment in shares of macarthur coal limited
                                                                                            
          payments of long-term debt
                                                             -25,700,000 -266,600,000 -13,400,000  -10,200,000 -228,200,000 -10,000,000 -18,800,000 -652,800,000 -493,100,000 -2,600,000 -25,700,000 -5,400,000 -3,000,000 -3,000,000 -5,100,000 -9,000,000 -9,238,000 -9,362,000 -3,085,000 -11,781,000 -9,805,000 -93,146,000 -562,653,000 -440,567,000 -29,847,000 -12,906,000 -4,577,000 -1,536,000 -1,856,000 -12,229,000 
          proceeds from stock options exercised
                                                               1,400,000  100,000 400,000 4,000,000 10,500,000 3,500,000 400,000 2,000,000 2,500,000 500,000   400,000 200,000 7,991,000 5,509,000 17,712,000 236,000 5,871,000 2,378,000 2,783,000 1,819,000 4,964,000 6,051,000 2,615,000 5,341,000 2,286,000 12,331,000 
          results of operations data
                                                                                            
          total revenues
                                                                                            
          costs and expenses
                                                                                            
          operating profit
                                                                                            
          interest expense
                                                                                            
          income from continuing operations before income taxes
                                                                                            
          income tax provision
                                                                                            
          less: net income attributable to noncontrolling interests
                                                                                            
          net income attributable to common stockholders
                                                                                            
          basic earnings per share from continuing operations
                                                                                            
          diluted earnings per share from continuing operations
                                                                                            
          weighted-average shares used for eps calculation
                                                                                            
          dividends declared per share
                                                                                            
          other data
                                                                                            
          tons sold
                                                                                            
          net cash from continuing operations:
                                                                                            
          operating activities
                                                                                            
          investing activities
                                                                                            
          financing activities
                                                                                            
          adjusted ebitda
                                                                                            
          balance sheet data
                                                                                            
          total assets
                                                                                            
          total long-term debt
                                                                                            
          total stockholders’ equity
                                                                                            
          asset retirement obligation expense
                                                                                            
          proceeds from sale of debt securities
                                                                  5,500,000 15,500,000 1,800,000                        
          workers’compensation obligations
                                                                   7,100,000                         
          repurchase of employee common stock relinquished for tax with holding
                                                                   -15,100,000                         
          adjustments to reconcile income from continuing operations, net of income taxes
                                                                                            
          to net cash from operating activities:
                                                                                            
          revenue recovery on coal supply agreement
                                                                                           
          dividends received from equity affiliates
                                                                            12,000 19,888,000 12,927,000 18,128,000 4,493,000 5,442,000 1,470,000    
          investments in debt and equity securities
                                                                    -1,000,000                        
          change in revolving line of credit
                                                                            -100,000,000 -91,000,000 93,300,000 72,700,000            
          acquisition of noncontrolling interests
                                                                                            
          accounts receivable, including securitization
                                                                     -189,600,000 -87,300,000 -2,000,000 37,900,000 -27,700,000 -21,800,000 93,000,000 33,900,000 -116,500,000 -16,030,000 -14,870,000 -15,928,000            
          amortization of debt discount and debt issuance costs
                                                                       2,000,000 2,000,000 1,900,000 2,000,000 1,900,000 1,700,000 1,700,000 1,626,000 1,674,000 1,674,000 1,672,000 1,670,000 2,169,000 2,264,000 1,712,000 1,619,000 1,815,000 1,761,000 1,712,000 1,670,000 1,795,000 
          additions to advance mining royalties
                                                                       -800,000 -1,200,000 -1,500,000 -1,000,000 -2,400,000 -1,900,000 -1,300,000 -899,000 -1,901,000 -1,751,000 -2,215,000 -1,600,000 -2,557,000 -4,371,000 -1,787,000 -2,613,000 -2,250,000 -5,505,000 -2,814,000 -3,112,000 -3,135,000 
          excess tax benefit related to stock options exercised
                                                                             700,000 16,355,000 10,445,000 83,726,000 401,000 10,106,000 2,510,000 2,398,000 4,293,000       
          net proceeds from borrowing
                                                                                            
          change in bank overdraft facility
                                                                         2,500,000 800,000 9,600,000                 
          proceeds from employee stock purchases
                                                                         2,800,000 100,000 2,200,000 2,400,000 1,000 2,799,000 3,280,000 3,097,000 2,746,000 1,772,000 -1,000 1,660,000 1,350,000 
          stock compensation
                                                                          8,700,000 8,600,000  8,100,000    6,320,000 6,349,000 6,128,000    4,102,000     
          net increase in cash and cash equivalents
                                                                           77,000,000 345,700,000 29,200,000 -7,768,000 37,268,000     9,106,000 -1,331,000   24,537,000 19,374,000 78,142,000 -8,411,000 
          loss from discontinued operations
                                                                            2,300,000 7,500,000 9,119,000 12,381,000             
          income from continuing operations
                                                                            295,600,000 377,100,000 242,554,000 69,546,000          113,340,000 95,254,000 51,890,000 
          adjustments to reconcile income from continuing operations to net cash from operating activities:
                                                                                            
          revenue recovery on coal supply agreements
                                                                                            
          minority interest expense
                                                                                            
          stock compensation expense
                                                                                            
          changes in current assets and liabilities, net of acquisitions:
                                                                                            
          acquisition of excel coal limited, net of cash acquired
                                                                                            
          acquisitions of minority interests
                                                                                            
          investment in prairie state
                                                                            -12,400,000 -10,000,000 -7,678,000 -10,822,000             
          distributions to minority interests
                                                                             -100,000 -575,000 -925,000 546,000 -1,390,000 -1,256,000 -875,000 -2,777,000 -1,157,000 -1,730,000 -1,000,000 -748,000 -750,000 -376,000 -624,000 
          acquisition of minority interests
                                                                                            
          asset retirement and employment related obligations
                                                                                            
          investments in joint ventures
                                                                                   -622,000         
          acquisition of excel coal, net of cash acquired
                                                                                            
          issuance of notes payable
                                                                                            
          adjustments to reconcile net income to net cash from operating activities:
                                                                                            
          obligation to industry fund
                                                                                 -340,000 4,389,000 3,587,000         
          acquisitions
                                                                                     -307,829,000 -44,538,000     
          investment in joint venture
                                                                                 -13,215,000    -503,000       
          payments of debt issuance costs
                                                                                            
          net decrease in cash and cash equivalents
                                                                                 134,039,000 -213,052,000 -31,184,000    -153,118,000     
          accounts receivable, net of sale
                                                                                  11,936,000 74,380,000  17,267,000 -23,130,000 10,853,000  -32,119,000 -16,955,000 -18,680,000 
          other acquisitions
                                                                                            
          increase of securitized interests in accounts receivable
                                                                                  6,500,000 5,800,000     25,000,000 
          other financing activities
                                                                                            
          purchase of mining and related assets
                                                                                            
          net proceeds from equity offering
                                                                                            
          stock-based compensation
                                                                                     4,278,000       
          purchase of mining assets
                                                                                         -56,500,000 
          increase in note receivable
                                                                                            
          tax benefit related to stock options exercised
                                                                                       13,096,000     
          cumulative effect of accounting changes, net of taxes
                                                                                            
          early debt extinguishment costs
                                                                                            
          net change in revolving lines of credit
                                                                                            
          effect of exchange rate changes on cash and cash equivalents
                                                                                            
          early debt extinguishment gains
                                                                                            
          dividends received from equity investments
                                                                                          4,379,000 716,000 
          acquisition