7Baggers

Century Aluminum Company
(NASDAQ:CENX) 

CENX stock logo

Century Aluminum Company, together with its subsidiaries, produces standard-grade and value-added primary aluminum products in the United States and Iceland. The company was incorporated in 1981 and is headquartered in Chicago, Illinois.

Founded: 1995
Full Time Employees: 2,079
Sector: Basic Materials
Industry: Aluminum

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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 2021-12-31 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 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 
                                                                                              
      net sales
                                                                                              
      related parties
    305,900,000 299,600,000 319,600,000 367,600,000 378,700,000 340,800,000 332,100,000 324,200,000 315,000,000 371,800,000 400,900,000 427,200,000 412,200,000 349,600,000 404,900,000 483,500,000 433,100,000 411,700,000 350,600,000 306,400,000 268,300,000 233,100,000 235,800,000 285,600,000 271,000,000 292,900,000 282,300,000 305,000,000 311,300,000 320,300,000 305,300,000 282,700,000 296,200,000 321,997,000 299,235,000 296,271,000 280,573,000 306,860,000 301,111,000 290,283,000 280,377,000 350,283,000 428,018,000 513,681,000 575,729,000 363,170,000 324,775,000 288,573,000 285,583,000 138,392,000 128,912,000 110,987,000 132,760,000 140,739,000 134,612,000 139,597,000 137,351,000 124,172,000 143,048,000 159,186,000 138,025,000 111,304,000 104,839,000 104,808,000 92,457,000 68,908,000 58,772,000 49,056,000 54,173,000 131,079,000 125,468,000 125,165,000 114,249,000 94,452,000 94,035,000 93,122,000 66,804,000 92,085,000 69,239,000 49,734,000 48,473,000 45,104,000 48,025,000 39,927,000 37,971,000 42,343,000 42,815,000 38,303,000   
      other customers
    343,300,000 334,100,000 312,600,000 260,500,000 255,200,000 290,100,000 207,000,000 236,600,000 174,500,000 140,500,000 144,300,000 148,300,000 140,200,000 180,300,000 232,300,000 373,100,000 320,500,000 247,400,000 230,800,000 221,600,000 175,700,000 156,000,000 157,100,000 116,300,000 150,200,000 142,500,000 155,700,000 168,100,000 178,700,000 166,600,000 176,500,000 187,300,000 158,300,000 111,850,000 101,410,000 92,531,000 85,213,000                                                      
      total net sales
    649,200,000 633,700,000 632,200,000 628,100,000 633,900,000 630,900,000 539,100,000 560,800,000 489,500,000 512,300,000 545,200,000 575,500,000 552,400,000 529,900,000 637,200,000 856,600,000 753,600,000 659,100,000 581,400,000 528,000,000 444,000,000 389,100,000 392,900,000 401,900,000 421,200,000 435,400,000 438,000,000 473,100,000 490,000,000 486,900,000 481,800,000 470,000,000 454,500,000 433,847,000 400,645,000 388,802,000 365,786,000 339,836,000 333,650,000 326,754,000 318,854,000 391,485,500 454,540,000 523,491,000 587,911,000                                              
      yoy
    2.41% 0.44% 17.27% 12.00% 29.50% 23.15% -1.12% -2.55% -11.39% -3.32% -14.44% -32.82% -26.70% -19.60% 9.60% 62.23% 69.73% 69.39% 47.98% 31.38% 5.41% -10.63% -10.30% -15.05% -14.04% -10.58% -9.09% 0.66% 7.81% 12.23% 20.26% 20.88% 24.25% 27.66% 20.08% 18.99% 14.72% -13.19% -26.60% -37.58% -45.76%                                                  
      qoq
    2.45% 0.24% 0.65% -0.91% 0.48% 17.03% -3.87% 14.57% -4.45% -6.03% -5.26% 4.18% 4.25% -16.84% -25.61% 13.67% 14.34% 13.36% 10.11% 18.92% 14.11% -0.97% -2.24% -4.58% -3.26% -0.59% -7.42% -3.45% 0.64% 1.06% 2.51% 3.41% 4.76% 8.29% 3.05% 6.29% 7.64% 1.85% 2.11% 2.48% -18.55% -13.87% -13.17% -10.96%                                               
      cost of goods sold
    530,400,000 551,400,000 554,900,000 591,900,000 573,300,000 564,600,000 457,300,000 540,400,000 473,000,000 472,900,000 556,700,000 559,600,000 504,300,000 549,300,000 680,200,000 840,700,000 660,400,000 589,700,000 526,800,000 507,100,000 464,700,000 390,300,000 420,000,000 414,900,000 416,400,000 428,700,000 451,700,000 477,200,000 502,800,000 546,200,000 493,600,000 436,300,000 440,000,000 385,955,000 359,243,000 366,342,000 348,935,000 334,779,000 351,262,000 321,172,000 321,906,000 402,616,000 496,963,000 515,149,000 493,816,000 461,243,000 424,918,000 419,820,000 422,605,000 385,889,000 387,574,000 337,635,000 303,692,000 301,124,000 301,385,000 317,662,000 305,598,000 331,796,000 334,322,000 316,763,000 284,021,000 275,716,000 263,409,000 266,337,000 251,413,000 242,539,000 231,051,000 194,380,000 296,948,000 464,776,000 430,256,000 388,973,000 375,147,000 372,207,000 369,875,000 355,613,000 337,005,000 331,291,000 310,303,000 297,972,000 270,478,000 258,170,000 240,778,000 237,908,000 234,788,000 239,738,000 230,948,000 218,542,000   
      gross profit
    118,800,000 82,300,000 77,300,000 36,200,000 60,600,000 66,300,000 81,800,000 20,400,000 16,500,000 39,400,000 -11,500,000 15,900,000 48,100,000 -19,400,000 -43,000,000 15,900,000 93,200,000 69,400,000 54,600,000 20,900,000 -20,700,000 -1,200,000 -27,100,000 -13,000,000 4,800,000 6,700,000 -13,700,000 -4,100,000 -12,800,000 -59,300,000 -11,800,000 33,700,000 14,500,000 47,892,000 41,402,000 22,460,000 16,851,000 5,057,000 -17,612,000 5,582,000 -3,052,000 -18,701,000 -42,423,000 8,342,000 94,095,000 89,996,000 75,714,000 38,504,000 -1,758,000 15,285,000 12,354,000 -5,698,000 17,582,000 16,543,000 3,250,000 5,957,000 20,592,000 -13,632,000 11,324,000 49,514,000 42,316,000 41,135,000 15,769,000 21,516,000 33,976,000 14,275,000 -2,352,000 -5,227,000 -72,361,000 -62,578,000 121,983,000 156,224,000 95,995,000 59,923,000 84,496,000 108,392,000 110,652,000 93,076,000 70,974,000 108,004,000 76,468,000 34,704,000 30,058,000 45,348,000 50,608,000 50,865,000 43,369,000 45,191,000   
      yoy
    96.04% 24.13% -5.50% 77.45% 267.27% 68.27% -811.30% 28.30% -65.70% -303.09% -73.26% 0.00% -48.39% -127.95% -178.75% -23.92% -550.24% -5883.33% -301.48% -260.77% -531.25% -117.91% 97.81% 217.07% -137.50% -111.30% 16.10% -112.17% -188.28% -223.82% -128.50% 50.04% -13.95% 847.04% -335.08% 302.36% -652.13% -127.04% -58.48% -33.09% -103.24% -120.78% -156.03% -78.33% -5452.39% 488.79% 512.87% -775.75% -110.00% -7.60% 280.12% -195.65% -14.62% -221.35% -71.30% -87.97% -51.34% -133.14% -28.19% 130.13% 24.55% 188.16% -770.45% -511.63% -146.95% -122.81% -101.93% -103.35% -175.38% -204.43% 44.37% 44.13% -13.25% -35.62% 19.05% 0.36% 44.70% 168.20% 136.12% 138.17% 51.10% -31.77% -30.69% 0.35%       
      qoq
    44.35% 6.47% 113.54% -40.26% -8.60% -18.95% 300.98% 23.64% -58.12% -442.61% -172.33% -66.94% -347.94% -54.88% -370.44% -82.94% 34.29% 27.11% 161.24% -200.97% 1625.00% -95.57% 108.46% -370.83% -28.36% -148.91% 234.15% -67.97% -78.41% 402.54% -135.01% 132.41% -69.72% 15.68% 84.34% 33.29% 233.22% -128.71% -415.51% -282.90% -83.68% -55.92% -608.55% -91.13% 4.55% 18.86% 96.64% -2290.22% -111.50% 23.73% -316.81% -132.41% 6.28% 409.02% -45.44% -71.07% -251.06% -220.38% -77.13% 17.01% 2.87% 160.86% -26.71% -36.67% 138.01% -706.93% -55.00% -92.78% 15.63% -151.30% -21.92% 62.74% 60.20% -29.08% -22.05% -2.04% 18.88% 31.14% -34.29% 41.24% 120.34% 15.46% -33.72% -10.39% -0.51% 17.28% -4.03%    
      gross margin %
    18.30% 12.99% 12.23% 5.76% 9.56% 10.51% 15.17% 3.64% 3.37% 7.69% -2.11% 2.76% 8.71% -3.66% -6.75% 1.86% 12.37% 10.53% 9.39% 3.96% -4.66% -0.31% -6.90% -3.23% 1.14% 1.54% -3.13% -0.87% -2.61% -12.18% -2.45% 7.17% 3.19% 11.04% 10.33% 5.78% 4.61% 1.49% -5.28% 1.71% -0.96% -4.78% -9.33% 1.59% 16.00% 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% NaN%  
      selling, general and administrative expenses
    25,800,000 35,500,000 17,900,000 14,000,000 12,500,000 14,800,000 15,600,000 12,300,000 14,100,000 8,100,000 10,800,000 12,000,000 13,400,000 11,300,000 8,700,000 5,800,000 11,700,000 18,600,000 14,200,000 8,700,000 16,100,000 11,800,000 11,000,000 11,800,000 8,900,000 9,200,000 11,600,000 11,900,000 14,700,000 8,700,000 8,800,000 12,000,000 10,700,000 11,398,000 13,994,000 9,352,000 10,702,000 10,961,000 9,733,000 9,945,000 9,625,000 8,566,000 11,566,000 10,012,000 11,971,000 16,369,000 12,146,000 10,618,000 10,062,000 21,602,000 14,422,000 15,154,000 16,299,000 10,571,000 9,182,000 7,151,000 8,459,000 8,916,000 7,950,000 18,557,000 10,609,000 11,101,000 12,486,000 10,964,000 12,251,000 15,093,000 11,395,000 11,271,000 10,120,000 4,253,000 11,253,000 13,851,000 18,866,000 19,136,000 13,372,000 14,445,000 12,967,000 10,724,000 8,144,000 8,376,000 12,119,000 9,827,000 8,104,000 8,046,000 8,796,000 7,950,000 7,567,000 3,991,000   
      gain on the sale of hawesville
    -287,900,000                                                                                          
      other operating expenses - net
    6,900,000 13,800,000 1,100,000 1,500,000                                                                                       
      operating income
    374,000,000 33,000,000 58,300,000 20,700,000 46,100,000 49,300,000 63,800,000 6,400,000 1,900,000 29,200,000 -24,200,000 -700,000 27,500,000 -30,500,000 -51,500,000 -149,500,000 81,300,000 50,500,000 40,300,000 12,100,000 -36,900,000 -13,200,000 -37,900,000 -25,000,000 -4,400,000 -2,900,000 -25,200,000 -16,300,000 -27,800,000 -68,400,000 -15,600,000 21,500,000 3,500,000 43,283,000 32,471,000 12,928,000 5,176,000 -159,644,000 -55,053,000 -4,941,000 -13,558,000 -28,486,000 -55,526,000 -35,121,000 80,045,000 66,851,000 62,151,000 26,012,000 -14,234,000 -8,631,000 -4,242,000 -23,870,000 187,000 2,645,000 -13,320,000 -5,011,000 8,412,000 -27,172,000 715,000 36,162,000 37,591,000 79,625,000 187,000 5,908,000 17,260,000 -6,831,000 41,852,000 -25,664,000 -106,813,000 -161,675,000 110,730,000 142,373,000 77,129,000 40,787,000 71,124,000 93,947,000 97,685,000 82,352,000 62,830,000 99,628,000 64,349,000 24,877,000 21,954,000 37,302,000 41,812,000 42,915,000 35,802,000 41,200,000   
      yoy
    711.28% -33.06% -8.62% 223.44% 2326.32% 68.84% -363.64% -1014.29% -93.09% -195.74% -53.01% -99.53% -66.17% -160.40% -227.79% -1335.54% -320.33% -482.58% -206.33% -148.40% 738.64% 355.17% 50.40% 53.37% -84.17% -95.76% 61.54% -175.81% -894.29% -258.03% -148.04% 66.31% -32.38% -127.11% -158.98% -361.65% -138.18% 460.43% -0.85% -85.93% -116.94% -142.61% -189.34% -235.02% -662.35% -874.55% -1565.13% -208.97% -7711.76% -426.31% -68.15% 376.35% -97.78% -109.73% -1962.94% -113.86% -77.62% -134.12% 282.35% 512.09% 117.79% -1265.64% -99.55% -123.02% -116.16% -95.77% -62.20% -118.03% -238.49% -496.39% 55.69% 51.55% -21.04% -50.47% 13.20% -5.70% 51.81% 231.04% 186.19% 167.08% 53.90% -42.03% -38.68% -9.46%       
      qoq
    1033.33% -43.40% 181.64% -55.10% -6.49% -22.73% 896.88% 236.84% -93.49% -220.66% 3357.14% -102.55% -190.16% -40.78% -65.55% -283.89% 60.99% 25.31% 233.06% -132.79% 179.55% -65.17% 51.60% 468.18% 51.72% -88.49% 54.60% -41.37% -59.36% 338.46% -172.56% 514.29% -91.91% 33.30% 151.17% 149.77% -103.24% 189.98% 1014.21% -63.56% -52.40% -48.70% 58.10% -143.88% 19.74% 7.56% 138.93% -282.75% 64.92% 103.47% -82.23% -12864.71% -92.93% -119.86% 165.82% -159.57% -130.96% -3900.28% -98.02% -3.80% -52.79% 42480.21% -96.83% -65.77% -352.67% -116.32% -263.08% -75.97% -33.93% -246.01% -22.23% 84.59% 89.10% -42.65% -24.29% -3.83% 18.62% 31.07% -36.94% 54.82% 158.67% 13.31% -41.15% -10.79% -2.57% 19.87% -13.10%    
      operating margin %
    57.61% 5.21% 9.22% 3.30% 7.27% 7.81% 11.83% 1.14% 0.39% 5.70% -4.44% -0.12% 4.98% -5.76% -8.08% -17.45% 10.79% 7.66% 6.93% 2.29% -8.31% -3.39% -9.65% -6.22% -1.04% -0.67% -5.75% -3.45% -5.67% -14.05% -3.24% 4.57% 0.77% 9.98% 8.10% 3.33% 1.42% -46.98% -16.50% -1.51% -4.25% -7.28% -12.22% -6.71% 13.62% 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% NaN%  
      interest expense - nonaffiliates
    -9,900,000 -10,600,000 -11,500,000 -9,800,000                                                                                       
      interest expense - affiliates
    -600,000 -600,000 -1,500,000 -1,900,000 -1,800,000    -1,800,000                                                                                  
      interest income
    3,100,000 2,700,000 2,800,000 1,900,000 1,800,000 400,000 400,000 600,000 700,000 900,000 400,000 400,000 300,000 300,000 100,000  100,000 600,000  100,000 100,000 200,000 100,000 400,000 100,000 200,000 200,000 200,000 200,000 200,000 400,000 500,000 500,000 462,000 422,000 283,000 230,000 283,000 190,000 171,000 114,000 91,000 45,000 61,000 142,000 104,000 23,000                   308,750 159,000 352,000 725,000 1,604,250 1,602,000 2,291,000 2,523,000 3,122,000 3,442,000 1,198,000 2,013,000 908,000 448,000 152,000 196,000 279,000 596,000 275,000 218,000 238,000 517,000 244,000   
      net loss on forward and derivative contracts - nonaffiliates
    -65,300,000 -12,800,000 -30,200,000                                                                                        
      gain on insurance proceeds - net
    33,000,000                                                                                          
      other loss - net
    -5,500,000 -2,825,000 -2,200,000      -1,500,000                                                                                  
      income before income taxes
    328,800,000 -23,700,000 9,500,000 -10,400,000 27,300,000 40,500,000 44,300,000 -6,200,000 245,200,000 32,300,000 -56,900,000 -3,400,000 -38,800,000 41,000,000 64,900,000 79,700,000 19,400,000 -67,825,000 -45,600,000 -83,400,000 -142,300,000                                                                      
      income tax expense
    -1,800,000    -1,600,000                           -2,300,000            -5,065,000  -11,304,000 -6,444,000 -1,654,000  1,583,000 -1,384,000 -2,791,000 -2,517,000 -1,526,000 -1,168,000 -3,395,000 -2,821,000   -3,636,000 -3,123,000                       -19,239,000 -6,479,000      
      net income
    327,000,000 -11,400,000 10,600,000 -9,100,000 25,700,000 40,400,000 42,300,000 -6,700,000 244,700,000 25,600,000 -45,900,000 6,600,000 -38,600,000 -113,500,000 44,300,000 37,400,000 17,700,000 60,400,000 -52,400,000 -35,100,000 -140,000,000 -35,500,000 -58,200,000 -26,900,000 -2,700,000 -4,800,000 -20,700,000 -20,700,000 -34,600,000 -65,000,000 -20,300,000 19,400,000 -300,000 35,805,000 20,783,000 7,131,000 -15,139,000 -168,464,000 -58,273,000 -9,515,000 -16,163,000 -43,080,000 -56,112,000 -33,897,000 73,779,000 61,849,000 50,405,000 20,344,000 -20,104,000 -9,675,000 -9,507,000 -34,573,000 8,253,000 -6,909,000 -12,023,000 -12,277,000 -4,401,000 -31,107,000 -6,600,000 23,986,000 25,046,000 65,280,000 -16,787,000 5,146,000 6,332,000 -24,354,000 40,142,000 -107,146,000 -114,624,000 -700,152,000 36,973,000 -2,341,000 -232,796,000 -112,303,000 7,470,000 -60,665,000 64,249,000 -119,123,000 173,939,000 45,800,000 -141,571,000 -148,658,000 -20,071,000 40,744,000 11,127,000 20,932,000 -16,049,000 18,288,000   
      yoy
    1172.37% -128.22% -74.94% 35.82% -89.50% 57.81% -192.16% -201.52% -733.94% -122.56% -203.61% -82.35% -318.08% -287.91% -184.54% -206.55% -112.64% -270.14% -9.97% 30.48% 5085.19% 639.58% 181.16% 29.95% -92.20% -92.62% 1.97% -206.70% 11433.33% -281.54% -197.68% 172.05% -98.02% -121.25% -135.66% -174.94% -6.34% 291.05% 3.85% -71.93% -121.91% -169.65% -211.32% -266.62% -466.99% -739.27% -630.19% -158.84% -343.60% 40.03% -20.93% 181.61% -287.53% -77.79% 82.17% -151.18% -117.57% -147.65% -60.68% 366.11% 295.55% -368.05% -141.82% -104.80% -105.52% -96.52% 8.57% 4476.93% -50.76% 523.45% 394.95% -96.14% -462.33% -5.73% -95.71% -232.46% -145.38% -19.87% -966.62% 12.41% -1372.32% -810.19% 25.06% 122.79%       
      qoq
    -2968.42% -207.55% -216.48% -135.41% -36.39% -4.49% -731.34% -102.74% 855.86% -155.77% -795.45% -117.10% -65.99% -356.21% 18.45% 111.30% -70.70% -215.27% 49.29% -74.93% 294.37% -39.00% 116.36% 896.30% -43.75% -76.81% 0.00% -40.17% -46.77% 220.20% -204.64% -6566.67% -100.84% 72.28% 191.45% -147.10% -91.01% 189.09% 512.43% -41.13% -62.48% -23.22% 65.54% -145.94% 19.29% 22.70% 147.76% -201.19% 107.79% 1.77% -72.50% -518.91% -219.45% -42.54% -2.07% 178.96% -85.85% 371.32% -127.52% -4.23% -61.63% -488.87% -426.21% -18.73% -126.00% -160.67% -137.46% -6.52% -83.63% -1993.68% -1679.37% -98.99% 107.29% -1603.39% -112.31% -194.42% -153.94% -168.49% 279.78% -132.35% -4.77% 640.66% -149.26% 266.17% -46.84% -230.43% -187.76%    
      net income margin %
    50.37% -1.80% 1.68% -1.45% 4.05% 6.40% 7.85% -1.19% 49.99% 5.00% -8.42% 1.15% -6.99% -21.42% 6.95% 4.37% 2.35% 9.16% -9.01% -6.65% -31.53% -9.12% -14.81% -6.69% -0.64% -1.10% -4.73% -4.38% -7.06% -13.35% -4.21% 4.13% -0.07% 8.25% 5.19% 1.83% -4.14% -49.57% -17.47% -2.91% -5.07% -11.00% -12.34% -6.48% 12.55% 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% NaN%  
      net loss attributable to noncontrolling interests
    -10,500,000 -13,200,000 -4,300,000 -4,500,000 -4,000,000 -4,800,000 -5,000,000 -4,200,000 -2,100,000 -4,400,000 -3,900,000 -900,000                                                                               
      net income attributable to century stockholders
    337,500,000 1,800,000 14,900,000 -4,600,000 29,700,000 45,200,000 47,300,000 -2,500,000 246,800,000 -18,275,000 -42,000,000 7,500,000                                                                               
      less: net income allocated to participating securities
     -200,000 800,000  1,500,000 2,400,000 2,500,000  13,200,000   400,000  1,500,000 2,700,000 2,300,000 1,100,000                                                                          
      net income allocated to common stockholders
    337,500,000 2,000,000 14,100,000 -4,600,000 28,200,000 42,800,000 44,800,000 -2,500,000 233,600,000 -18,275,000 -42,000,000 7,100,000 -38,600,000 23,350,000 41,600,000 35,100,000 16,600,000 -56,875,000 -52,400,000 -35,100,000 -140,000,000 -21,950,000 -58,200,000 -26,900,000 -2,700,000 -19,000,000 -20,700,000 -20,700,000 -34,600,000 -300,000 -20,300,000 17,900,000  2,939,500 19,132,000 6,563,000    -9,515,000 -16,163,000 -4,057,500 -56,112,000 -33,897,000 67,813,000 11,621,750 46,277,000 18,675,000                                           
      purchases from related party were 64.2 million and 88.3 million for the three months ended march 31, 2026 and 2025, respectively.
                                                                                              
      net income attributable to century stockholders per common share:
                                                                                              
      basic
    3,410,000 10,000 150,000 -50,000 300,000 745,000 480,000 -30,000                                                                                   
      diluted
    3,230,000 20,000 150,000 -50,000 290,000 707,500 460,000 -30,000                                                                                   
      weighted-average common shares outstanding:
                                                                                              
      basic
    99,000,000 94,200,000 93,300,000 93,300,000 93,300,000 92,800,000 92,800,000 92,700,000 92,700,000  92,400,000 92,300,000 92,300,000  91,300,000 91,200,000 91,200,000           88,800,000   87,600,000 87,600,000   87,318,000 87,272,000    87,060,000 87,040,000  86,907,000 86,873,000 88,814,000  88,827,000 88,787,000 88,717,000  88,611,000 88,597,000 88,555,000  88,468,000 88,452,000 88,727,000  92,032,000 93,105,000 92,965,000  92,738,000 92,672,000 92,550,000  74,214,000              32,263,000  32,162,000 32,140,000 32,057,000  31,754,000 29,629,000   
      diluted
    104,600,000 95,300,000 99,200,000 93,300,000 99,200,000 98,400,000 98,400,000 92,700,000 98,700,000  92,400,000 93,200,000 92,300,000  97,300,000 97,600,000 97,100,000           88,800,000   87,600,000 88,400,000   88,255,000 88,057,000    87,060,000 87,040,000  86,907,000 86,873,000 89,369,000  89,532,000 89,352,000 88,717,000  88,611,000 88,597,000 89,020,000  88,468,000 88,452,000 88,727,000  92,032,000 93,567,000 93,297,000  92,738,000 93,332,000 93,103,000  74,721,000              32,263,000  32,162,000 32,196,000 32,129,000  31,754,000 30,542,000   
      net gain on forward and derivative contracts - affiliates
                                                                                              
      loss on early extinguishment of debt
     -1,500,000 -6,200,000                 -24,700,000   -1,200,000                             -3,272,000                                   -47,448,000    
      bargain purchase gain
            245,900,000                                                                                  
      income tax benefit
     12,300,000 1,100,000 1,300,000  -200,000 -2,000,000 -500,000 -500,000 -6,600,000 11,000,000 10,000,000 200,000 17,200,000 -20,600,000 -42,300,000 -1,700,000 -13,200,000 -6,800,000 48,300,000 2,300,000 1,500,000 -300,000 -900,000 2,800,000 2,700,000 1,300,000 1,600,000 2,900,000    1,000,000 -1,116,250 -3,321,000 -1,452,000 308,000 809,250 848,000 319,000 2,070,000 -3,051,250 2,161,000  -9,301,000    1,094,000         -2,213,000 -5,387,000   -2,803,000 570,000 -4,619,000 -4,281,000 4,257,000 6,577,000 -2,573,000 4,096,000 -524,282,000 9,641,000 57,087,000 138,243,000 74,453,000 10,438,000 57,045,000 -28,087,000 79,716,000 -92,922,000 -19,109,000 84,356,000 92,707,000 14,064,000   -10,521,000 8,890,000 -10,463,000   
      purchases from related party were 90.7 million and 63.9 million for the three months ended september 30, 2025 and 2024, respectively. purchases from related party were 230.8 million and 179.1 million for the nine months ended september 30, 2025 and 2024, respectively.
                                                                                              
      net gain on forward and derivative contracts - nonaffiliates
       -15,600,000 -5,400,000                                                                                      
      other income - net
       -5,700,000 -3,400,000 -100,000 -4,000,000 1,100,000  -800,000 1,300,000 -3,500,000 -300,000 -1,400,000 11,600,000 3,100,000 2,000,000 2,500,000 -2,500,000 1,200,000 1,900,000 500,000  1,300,000 1,700,000 500,000 -900,000 -1,700,000 1,100,000 1,200,000 700,000 2,100,000 -1,100,000 -96,000 427,000  384,000 1,781,000 -157,000 -299,000 -6,000           -1,284,000 70,000 -2,539,000 7,648,000 161,000 306,000 -399,500 -1,143,000 -1,132,000 677,000 55,250 -417,000 230,000 408,000   586,000    306,000  -856,500 -131,000 -3,139,000               
      purchases from related party were 51.8 million and 56.2 million for the three months ended june 30, 2025 and 2024, respectively. purchases from related parties were 140.1 million and 115.2 million for the six months ended june 30, 2025 and 2024, respectively.
                                                                                              
      other operating expense - net
        2,000,000 2,200,000 2,400,000 1,700,000 500,000 2,100,000 1,900,000 4,600,000 7,200,000 50,000 -200,000 200,000 200,000 300,000 100,000 100,000 100,000 200,000 -200,000 200,000 300,000 400,000 -100,000 300,000 300,000  -500,000 200,000 300,000 521,000 437,000 180,000 973,000 1,520,000 878,000 578,000 881,000                                                  
      interest expenses - nonaffiliates
        -10,000,000                                                                                      
      purchases from related party were 88.3 million and 59.0 million for the quarters ended march 31, 2025 and 2024, respectively.
                                                                                              
      net sales:
                                                                                              
      interest expense
         -5,000,000 -11,900,000 -10,300,000 -7,400,000 -7,100,000 -9,200,000 -8,700,000 -8,700,000 -8,400,000 -7,900,000 -5,700,000 -7,300,000 -6,200,000 -6,100,000 -7,500,000 -9,000,000 -8,700,000 -9,100,000 -5,900,000 -6,000,000 -5,700,000 -5,600,000 -5,800,000 -5,800,000 -5,700,000 -5,600,000 -5,600,000 -5,500,000 -5,600,000 -5,542,000 -5,461,000 -5,571,000 -5,695,000 -5,531,000 -5,497,000 -5,493,000 -5,412,000 -5,418,000 -5,573,000 -5,551,000 -5,474,000 -5,493,000                   -6,005,750 -8,004,000 -7,977,000 -8,043,000 -4,615,000 -6,036,000 -6,180,000 -6,243,000 -6,698,500 -6,099,000 -8,637,000 -11,043,000 -6,455,500 -10,271,000 -8,799,000 -6,751,000          
      net loss on forward and derivative contracts
         -150,000 -4,000,000      -57,600,000    -56,700,000                                                                          
      net gain on forward and derivative contracts
           -4,000,000 7,400,000 11,900,000 -25,200,000 9,100,000  -90,600,000 112,600,000 231,800,000  26,800,000 -76,700,000 -64,400,000 -98,100,000 -15,400,000 -9,400,000 3,700,000 3,800,000 1,300,000 10,300,000 6,100,000 -5,700,000 3,500,000 800,000 1,200,000 700,000 519,000 -3,888,000 2,957,000 -16,137,000 489,000 1,275,000 353,000 353,000 396,000 285,000 566,000 353,000 353,000 353,000 352,000 -879,000 447,000 440,000 204,000 15,507,000                                      
      income attributable to century stockholders per common share:
                                                                                              
      basic
            2,520,000 -197,500 -450,000 80,000                                                                               
      diluted
            2,260,000 -197,500 -450,000 70,000                                                                               
      asset impairment
                   159,400,000                                                                           
      income before equity in earnings of joint ventures
             -19,475,000 -45,900,000 6,600,000  24,850,000 44,300,000 37,400,000  60,500,000 -52,400,000 -35,100,000  -35,400,000 -58,200,000 -26,900,000 -2,700,000 -4,700,000 -20,700,000 -16,500,000 -35,100,000 -66,000,000 -21,000,000 17,400,000  35,450,000 20,569,000 7,379,000    -9,894,000 -16,520,000 -32,099,000 -56,816,000 -34,752,000 73,269,000 61,205,000 50,120,000 19,473,000 -19,609,000    7,302,000 -7,416,000 -13,149,000 -12,626,000 -5,042,000 -31,966,000 -7,507,000 23,526,000 23,827,000 64,487,000 -17,970,000 4,669,000 5,227,000 -28,141,250 39,572,000              -144,771,000 4,770,000 -23,147,000 35,845,000 5,779,000      
      equity in earnings of joint ventures
                             -100,000  100,000 500,000 1,000,000 700,000 2,000,000 600,000 355,000 214,000 -248,000 471,000 383,000 155,000 379,000 357,000 603,000 704,000 855,000 510,000 644,000 285,000 871,000 -495,000 544,000 731,000 436,000 951,000 507,000 1,126,000 349,000 641,000 859,000 907,000 460,000 1,219,000 793,000 1,183,000 477,000 1,105,000 867,000 570,000 -68,746,000 -887,000 4,440,000 2,507,000 5,566,000 4,393,000 4,294,000 3,737,000 4,167,000 3,447,000 4,953,000 3,583,000 4,347,000 3,200,000 3,330,750 3,076,000 4,899,000 5,348,000      
      income per common share:
                                                                                              
      basic
                -420,000 255,000 460,000 380,000 180,000                 380 220 80                                                       
      diluted
                -420,000 242,500 430,000 360,000 180,000                 380 220 70                                                       
      interest expense – hawesville term loan
                                                                                              
      interest expense - hawesville term loan
                     -275,000 -600,000 -200,000 -300,000 -400,000 -400,000                                                                    
      earnings per common share:
                                                                                              
      basic and diluted
                     -630,000 -580,000 -390,000 -1,550,000 -245,000 -650,000 -300,000 -30,000 -215,000 -230,000 -230,000 -390,000            -190 -47.5 -650  760 130 520 210 -230    90 -80 -140 -140 -50 -310 -70 240 250 650 -180                  -4,390          
      weighted-average common shares outstanding:
                                                                                              
      basic and diluted
             92,400,000    91,400,000     90,100,000 90,100,000 90,100,000  89,500,000 89,500,000 89,300,000  88,900,000  88,100,000    87,600,000    87,254,000  87,076,000                             74,143,000                       
      income before income taxes and equity in earnings of joint ventures
                         -36,900,000 -57,900,000 -26,000,000 -5,500,000 -7,400,000 -22,000,000 -18,100,000 -38,000,000 -69,200,000 -19,300,000 19,700,000  38,568,000 23,890,000 8,831,000    -10,213,000 -18,590,000 -35,028,000 -58,977,000 -29,687,000 82,570,000 72,509,000 56,564,000 21,127,000 -20,703,000    9,819,000 -5,890,000 -11,981,000 -9,231,000 -2,221,000 -29,753,000 -2,120,000 27,162,000 26,950,000 67,290,000 -18,540,000 9,288,000 9,508,000 -30,166,250 32,995,000              -229,127,000 7,772,500 -37,211,000 55,084,000       
      loss on sale of bhh
                               -4,300,000                                                               
      interest expense - term loan
                           -500,000 -700,000 -325,000 -800,000 -600,000                                                               
      helguvik
                                 -1,125,000 -4,500,000                                                            
      ravenswood
                                                                                              
      income tax
                                 -750,000 -1,700,000                                                            
      earnings per common share:
                                                                                              
      basic
                                 -2,500 -230,000 200,000        -110    -390                      -640 450       77.5 180       252.5 -620 1,270 350      
      diluted
                                 -2,500 -230,000 200,000        -110    -390                      -640 450       72.5 170       252.5 -620 1,270 350      
      loss before income taxes and equity in earnings of joint ventures
                                    -1,900,000    -15,918,000 -22,019,750 -59,276,000           -7,010,500 -8,854,000 -32,218,000                -35,827,000 -117,833,000   -64,994,000                   
      loss before equity in earnings of joint ventures
                                    -900,000    -15,610,000 -21,210,500 -58,428,000           -8,189,000 -10,238,000 -35,009,000                -38,400,000 -113,737,000   -7,907,000                   
      net loss allocated to common stockholders
                                    -300,000    -15,139,000 -20,987,750 -58,273,000                                                    
      loss per common share:
                                                                                              
      basic and diluted
                                        -170 -240 -670           -87.5 -110 -390                -1,450 -1,770                      
      ravenswood losses
                                      -5,500,000                                                        
      other (expense) - net
                                       -1,876,000                                                       
      third-party customers
                                         32,976,000 32,539,000 36,471,000 38,477,000 33,632,000 26,522,000 9,810,000 12,182,000 188,069,000 175,857,000 169,751,000 135,264,000 262,782,000 271,016,000 220,950,000 188,514,000 176,928,000 170,023,000 184,022,000 188,839,000 193,992,000 202,598,000 207,091,000 188,312,000 205,547,000 174,339,000 183,045,000 192,932,000 187,906,000 169,927,000 140,097,000 170,414,000 271,119,000 426,771,000 420,032,000 356,893,000 337,678,000 360,336,000 370,883,000 380,853,000 332,282,000 312,038,000 356,242,000 298,473,000 247,770,000 222,811,000 243,329,000 247,425,000 248,260,000 231,502,000 225,430,000   
      ravenswood charges
                                          26,830,000                                                    
      unrealized gain on fair value of contingent consideration
                                              1,523,000 10,287,000 6,527,000                                              
      ravenswood impairment
                                               30,850,000                                               
      other operating expense – net
                                             1,219,000 1,537,000 2,601,000 2,079,000 6,776,000 1,417,000 1,874,000 2,414,000        3,721,000                                  
      other income – net
                                             -1,617,000 114,000 93,000 1,054,000 1,414,000 -470,000 300,000 -253,000 1,497,000 213,000               25,250 -243,000                        
      net sales: - sum
                                                 551,239,000 500,632,000 458,324,000 420,847,000 401,174,000 399,928,000 331,937,000 321,274,000 317,667,000 304,635,000 323,619,000 326,190,000 318,164,000 345,646,000 366,277,000 326,337,000 316,851,000 279,178,000 287,853,000 285,389,000 256,814,000 228,699,000 189,153,000 224,587,000 402,198,000 552,239,000 545,197,000 471,142,000 432,130,000 454,371,000 464,005,000 447,657,000 424,367,000 381,277,000 405,976,000 346,946,000 292,874,000 270,836,000 283,256,000 285,396,000 290,603,000 274,317,000 263,733,000   
      gain on bargain purchase
                                                       2,042,000                                       
      interest expense – third party
                                                   -5,571,000 -5,477,000 -5,385,000 -5,406,000 -6,224,000 -6,076,000 -6,063,000 -6,041,000 -5,946,000 -5,978,000 -6,015,000 -5,951,000 -6,386,000 -6,777,000 -6,394,000 -6,477,000 -6,357,000 -6,398,000                 -4,853,250 -6,213,000  -6,684,000 -8,124,000 -10,657,000 -11,474,000   
      interest income – third party
                                                   34,000 140,000 270,000 141,000 186,000 131,000 81,000 72,000 113,000 138,000 81,000 37,000 65,000 155,000 223,000 190,000 102,000 101,000                          
      net income allocated to common shareholders
                                                    -20,104,000    7,567,000 -7,175,250 -12,023,000 -12,277,000 -4,401,000 9,750,750 -6,600,000 22,061,000 23,005,000 -1,327,250 -16,787,000 4,723,000 5,808,000 -45,407,000 33,270,000   -49,541,000 28,369,000                    
      other operating expenses – net
                                                     1,572,000 2,174,000 3,018,000 1,096,000           4,644,000 4,465,000                          
      interest income – related parties
                                                         15,500  2,000 60,000 61,000 59,000 70,000 113,000 115,000 113,000 111,000 109,000                          
      net loss allocated to common shareholders
                                                     -7,659,500 -9,507,000 -34,573,000                                       
      other operating expenses (income) – net
                                                         3,327,000 7,388,000 3,817,000  -2,107,500 2,659,000 -5,205,000 -5,884,000 3,051,250 3,096,000                            
      net gain on forward contracts
                                                         -101,000 -340,000 1,450,000  3,067,000 4,163,000 -1,617,000    9,294,000         -448,308,000 -69,974,250 -75,041,000  390,000 -26,737,000 210,268,000 -30,456,000    24,496,000  -4,375,000 -3,149,000 -1,177,000   
      net loss on forward contracts
                                                            -5,159,000    -4,809,000 -5,681,000 -12,136,000  -1,972,000 -11,631,000 -914,000 -3,268,000 -3,602,000 -13,253,000 -79,103,000 -203,784,000    -205,246,000     -286,760,000 -13,120,000 -53,481,000  -23,495,000      
      income per common share:
                                                                                              
      basic and diluted
                                                                   50 60                          
      other operating income – net
                                                                     -5,525,250 -55,599,000                        
      interest expense – related parties
                                                                         -1,000 -1,144,000                    
      interest income – affiliates
                                                                     107,750 145,000 144,000 142,000 36,500 146,000                    
      weighted-average common shares outstanding
                                                                                              
      basic
    99,000,000 94,200,000 93,300,000 93,300,000 93,300,000 92,800,000 92,800,000 92,700,000 92,700,000  92,400,000 92,300,000 92,300,000  91,300,000 91,200,000 91,200,000           88,800,000   87,600,000 87,600,000   87,318,000 87,272,000    87,060,000 87,040,000  86,907,000 86,873,000 88,814,000  88,827,000 88,787,000 88,717,000  88,611,000 88,597,000 88,555,000  88,468,000 88,452,000 88,727,000  92,032,000 93,105,000 92,965,000  92,738,000 92,672,000 92,550,000  74,214,000              32,263,000  32,162,000 32,140,000 32,057,000  31,754,000 29,629,000   
      diluted
    104,600,000 95,300,000 99,200,000 93,300,000 99,200,000 98,400,000 98,400,000 92,700,000 98,700,000  92,400,000 93,200,000 92,300,000  97,300,000 97,600,000 97,100,000           88,800,000   87,600,000 88,400,000   88,255,000 88,057,000    87,060,000 87,040,000  86,907,000 86,873,000 89,369,000  89,532,000 89,352,000 88,717,000  88,611,000 88,597,000 89,020,000  88,468,000 88,452,000 88,727,000  92,032,000 93,567,000 93,297,000  92,738,000 93,332,000 93,103,000  74,721,000              32,263,000  32,162,000 32,196,000 32,129,000  31,754,000 30,542,000   
      other operating expenses – curtailment costs
                                                                       9,166,000                       
      other operating expenses
                                                                        24,332,000                      
      other expense - net
                                                                        -242,000 -399,250 -1,370,000  -533,000    -156,000              
      weighted average common shares outstanding:
                                                                                              
      basic and diluted
                                                                        64,608,000                      
      income (loss) before income taxes and equity in earnings of joint ventures
                                                                         -103,900,250 24,825,000  -375,432,000 -9,923,250 -6,705,000 -121,877,000 88,889,000 -203,792,000 263,278,000 60,562,000           
      income (loss) before equity in earnings of joint ventures
                                                                         -52,657,500 34,466,000  -237,189,000 -74,250 3,733,000 -64,832,000 60,802,000 -124,076,000 170,356,000 41,453,000           
      earnings (loss) per common share:
                                                                                              
      basic
                                                                         -1,142.5 590 -60 -5,670   -1,770 1,980 602.5 5,360 1,410           
      diluted
                                                                         -1,142.5 570 -60 -5,670   -1,770 1,870 595 5,260 1,350           
      weighted average common shares outstanding:
                                                                                              
      basic
                                                                          47,720,000 41,143,000 41,040,000  40,957,000 34,224,000 32,508,000  32,438,000 32,419,000           
      diluted
                                                                          49,975,000 41,143,000 41,040,000  43,459,000 34,224,000 34,426,000  33,148,000 34,297,000           
      other income
                                                                                 -30,250 3,000 37,000 -161,000 175,750 -67,000 -472,000 407,000   9,000   
      weighted average common shares outstanding
                                                                                              
      basic
                                                                          47,720,000 41,143,000 41,040,000  40,957,000 34,224,000 32,508,000  32,438,000 32,419,000           
      diluted
                                                                          49,975,000 41,143,000 41,040,000  43,459,000 34,224,000 34,426,000  33,148,000 34,297,000           
      interest expense – related party
                                                                                         -95,000  -51,000   
      preferred dividends
                                                                                           -269,000   
      net income applicable to common shareholders
                                                                                     -148,658,000 -20,071,000 40,744,000 11,127,000 20,932,000 -16,049,000 18,019,000   
      interest expense — third party
                                                                                       -6,517,000       
      interest expense — related party
                                                                                              
      income before income taxes and equity earnings in earnings of joint ventures
                                                                                        12,258,000      
      other expense
                                                                                         -152,250 -4,000    
      income before income taxes, minority interest and cumulative effect of change in accounting principle
                                                                                         2,853,000 -24,939,000 28,751,000   
      income before minority interest and cumulative effect of change in accounting principle
                                                                                         1,759,750 -16,049,000 18,288,000   
      minority interest
                                                                                              
      income before cumulative effect of change in accounting principle
                                                                                         20,932,000 -16,049,000 18,288,000   
      cumulative effect of change in accounting principle, net of tax benefit of 3,430
                                                                                              
      earnings per common share:
                                                                                              
      basic:
                                                                                              
      cumulative effect of change in accounting principle
                                                                                              
      diluted:
                                                                                              
    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 2021-12-31 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 2004-12-31 2004-09-30 2004-06-30 2003-12-31 
                                                                                               
        assets
                                                                                               
        cash and cash equivalents
      244,100,000 134,200,000 151,400,000 40,700,000 44,900,000 32,900,000 32,600,000 41,300,000 93,500,000 88,800,000 70,300,000 50,600,000 30,400,000 54,300,000 64,800,000 30,000,000 26,600,000 29,000,000 57,600,000 9,000,000 26,300,000 81,600,000 81,400,000 174,100,000 147,600,000 38,900,000 22,500,000 25,700,000 22,200,000 38,900,000 73,400,000 124,000,000 130,800,000 167,211,000 174,213,000 130,673,000 125,895,000 132,403,000 117,593,000 129,384,000 126,461,000 115,393,000 122,976,000 167,408,000 226,431,000 163,242,000 133,410,000 61,384,000 52,498,000 84,088,000 140,801,000 127,531,000 195,471,000 183,976,000 173,375,000 156,512,000 182,545,000 183,401,000 216,395,000 232,401,000 293,487,000 304,296,000 265,243,000 256,264,000 213,739,000            168,124,000 96,365,000 50,094,000 29,175,000 17,512,000 17,752,000 55,847,000 35,174,000 52,763,000 44,168,000 76,474,000 75,169,000 28,204,000 
        restricted cash
      89,500,000 1,400,000 1,400,000 2,800,000 2,800,000 2,800,000 2,800,000 1,500,000 1,500,000 1,500,000 24,400,000 10,900,000 1,200,000 1,200,000 1,200,000 2,500,000 21,600,000 11,700,000 11,300,000 1,200,000 1,200,000 2,700,000 3,700,000 3,700,000 1,800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 848,000 848,000 855,000 797,000 1,050,000 1,046,000 2,669,000 795,000 791,000 942,000 1,083,000 21,813,000 801,000 1,217,000 3,031,000 1,032,000 1,697,000 3,273,000 978,000 258,000 258,000       3,673,000 3,673,000 22,524,000 9,862,000 9,372,000 8,879,000 8,369,000 865,000 865,000 865,000 10,583,000 2,771,000  873,000 867,000 2,012,000 2,011,000 2,011,000 2,026,000 6,029,000 6,029,000 2,028,000 2,028,000 2,027,000 1,677,000 1,678,000 1,675,000 8,500,000  
        accounts receivable - net
      111,000,000 109,900,000 116,900,000 108,200,000 108,900,000 75,800,000 62,200,000 83,700,000 47,800,000 53,700,000 65,300,000 48,800,000 47,800,000 66,900,000 72,100,000 122,100,000 127,700,000 80,600,000 78,600,000 67,000,000 57,400,000 51,000,000 50,600,000 35,900,000 52,900,000 70,100,000 81,900,000 92,300,000 90,900,000 82,500,000 91,400,000 96,600,000 83,400,000 43,071,000 40,367,000 42,473,000 36,225,000 12,432,000 11,187,000 14,304,000 12,668,000                                                 
        non-trade receivables
      41,800,000 38,100,000    13,200,000 52,700,000 53,500,000 38,500,000 36,200,000                                                                                
        due from affiliates
      52,600,000 29,600,000 15,700,000 13,800,000 8,400,000 25,100,000 12,000,000 7,500,000 22,800,000 20,200,000 20,100,000 18,200,000 16,500,000 4,800,000 14,700,000 17,100,000 18,600,000 8,300,000 10,700,000 25,700,000 21,300,000 10,300,000 15,000,000 9,800,000 17,800,000 30,100,000 23,300,000 21,400,000 23,800,000 22,700,000 20,500,000 6,600,000 8,700,000 10,366,000 11,849,000 10,495,000 11,789,000 16,651,000 14,271,000 14,511,000 15,478,000 17,417,000 29,097,000 52,310,000 85,062,000 31,503,000 52,452,000 54,094,000 56,131,000 43,587,000 24,955,000 24,964,000 43,561,000 37,870,000 39,755,000 34,671,000 39,217,000 44,665,000 47,352,000 37,264,000 39,240,000 51,006,000 34,790,000 34,222,000 35,524,000 19,255,000 16,052,000 14,063,000 12,158,000 39,062,000 36,463,000 33,288,000 35,206,000 26,693,000 27,693,000 37,999,000 22,468,000 37,542,000 28,200,000 15,635,000 21,703,000 18,638,000 17,617,000 14,044,000 14,269,000 14,371,000 12,094,000 12,016,000 10,957,000 
        manufacturing credit receivable
      173,300,000 172,600,000 156,600,000 81,500,000 81,500,000 81,500,000 78,800,000 57,100,000 57,900,000 59,300,000                                                                                
        inventories
      512,100,000 519,600,000 556,700,000 513,400,000 542,200,000 539,000,000 544,500,000 467,500,000 484,200,000 477,000,000 465,900,000 510,800,000 434,800,000 398,800,000 383,200,000 415,900,000 426,500,000 425,600,000 343,300,000 331,500,000 303,000,000 291,100,000 267,500,000 275,000,000 317,600,000 320,600,000 322,300,000 339,200,000 327,400,000 343,800,000 390,400,000 363,000,000 330,700,000 317,469,000 261,756,000 254,611,000 244,720,000 233,563,000 233,288,000 231,832,000 220,502,000 231,872,000 298,859,000 318,422,000 297,814,000 283,480,000 241,750,000 243,648,000 252,099,000 239,615,000 231,505,000 224,707,000 156,815,000 159,925,000 159,968,000 158,538,000 170,302,000 171,961,000 165,714,000 187,388,000 163,971,000 155,908,000 139,522,000 135,636,000 140,670,000 131,473,000 130,623,000 126,832,000 112,753,000 138,111,000 211,255,000 205,348,000 187,939,000 175,101,000 166,400,000 167,344,000 163,843,000 145,410,000 145,739,000 132,956,000 127,965,000 111,436,000 106,208,000 104,450,000 103,427,000 108,555,000 102,652,000 104,321,000 89,360,000 
        derivative assets
      6,800,000 1,500,000 3,300,000 4,400,000 7,600,000 4,200,000 2,100,000 5,400,000 5,300,000 2,900,000 9,500,000 34,500,000 51,300,000 127,300,000  140,400,000 73,300,000 34,800,000 33,700,000 25,600,000 13,800,000 6,400,000 10,600,000 18,300,000 32,700,000 14,600,000                                                                
        prepaid and other current assets
      23,300,000 24,400,000 25,100,000 25,500,000 25,600,000 28,300,000 19,200,000 18,400,000 29,600,000 27,500,000 28,900,000 26,200,000 22,600,000 24,500,000 24,500,000 29,000,000 34,200,000 28,200,000 19,700,000 18,000,000 17,900,000 12,900,000 14,500,000 14,600,000 13,400,000 12,200,000 23,300,000 22,200,000 18,200,000 18,000,000 13,900,000 15,900,000 14,200,000 14,709,000 21,761,000 18,624,000 18,968,000 22,210,000 31,828,000 27,953,000 29,622,000 42,412,000 36,620,000 36,236,000 23,809,000 29,768,000 29,101,000 25,320,000 35,201,000 32,276,000 40,708,000 41,446,000 41,163,000 34,975,000 48,253,000 43,131,000 43,850,000 40,646,000 44,491,000 46,151,000 45,520,000 18,292,000 25,506,000 39,913,000 74,669,000 93,921,000 90,262,000 19,901,000 23,557,000 99,861,000 33,275,000 59,886,000 50,130,000 40,091,000 20,194,000 20,355,000 19,573,000 19,830,000 25,905,000 21,375,000 23,190,000 23,918,000 22,348,000 16,172,000 12,759,000 10,055,000 8,896,000 9,648,000 4,101,000 
        total current assets
      1,254,500,000 1,031,300,000 1,027,100,000 790,300,000 821,900,000 802,800,000 806,900,000 735,900,000 781,100,000 767,100,000 684,400,000 700,000,000 604,600,000 677,800,000 758,600,000 757,000,000 728,500,000 618,200,000 554,900,000 478,000,000 440,900,000 456,000,000 443,300,000 531,400,000 583,800,000 487,300,000 474,100,000 501,600,000 483,300,000 506,700,000 590,400,000 606,900,000 568,600,000 553,674,000 510,794,000 457,731,000 438,394,000 440,622,000 432,452,000 450,348,000 435,241,000 448,057,000 543,455,000 599,547,000 672,674,000 599,240,000 522,120,000 453,344,000 456,194,000 471,061,000 512,209,000 523,306,000 509,306,000 487,397,000 465,678,000 464,788,000 486,445,000 488,320,000 526,019,000 558,042,000 582,274,000 577,078,000 526,564,000 512,590,000 509,366,000 489,468,000 486,304,000 426,301,000 451,342,000 514,134,000 626,069,000 891,298,000 840,006,000 747,198,000 754,826,000 768,467,000 584,510,000 517,639,000 405,183,000 376,642,000 345,530,000 294,493,000 298,852,000 299,900,000 307,043,000 284,091,000 285,065,000 284,186,000  
        property, plant and equipment - net
      1,205,100,000 1,167,600,000 972,200,000 975,600,000 972,200,000 978,300,000 965,300,000 971,500,000 984,200,000 1,004,200,000 994,800,000 860,800,000 743,200,000 744,400,000 740,900,000 738,400,000 893,300,000 892,500,000 872,800,000 868,800,000 867,400,000 880,400,000 899,700,000 919,000,000 935,400,000 949,200,000 950,100,000 951,500,000 960,100,000 967,300,000 961,500,000 947,900,000 955,100,000 971,916,000 984,948,000 1,000,503,000 1,012,564,000 1,026,285,000 1,185,101,000 1,197,604,000 1,215,222,000                                                 
        manufacturing credit receivable - less current portion
      24,900,000  63,800,000 113,500,000 91,100,000 70,400,000                                                                                    
        other assets
      170,400,000 70,400,000 71,100,000 69,600,000 69,300,000 87,900,000 124,700,000 97,800,000 84,600,000 75,200,000 81,800,000 75,700,000 51,300,000 49,800,000 54,000,000 89,600,000 66,900,000 59,200,000 61,500,000 58,600,000 55,100,000 61,500,000 61,100,000 69,700,000 66,800,000 62,700,000 42,000,000 37,900,000 62,400,000 63,500,000 61,800,000 62,100,000 57,100,000 56,051,000 67,721,000 67,395,000 74,849,000 73,420,000 71,163,000 71,636,000 73,142,000 72,155,000 111,770,000 125,830,000 124,529,000 123,577,000 95,656,000 93,122,000 90,768,000 91,474,000 108,221,000 97,838,000 101,039,000 100,715,000 120,117,000 106,284,000 104,875,000 104,549,000 113,332,000 100,055,000 85,205,000 82,954,000 79,227,000 79,663,000 72,615,000 68,135,000 76,912,000 89,905,000 160,642,000 141,802,000 145,918,000 144,567,000 112,670,000 107,518,000 323,824,000 335,814,000 280,411,000 292,380,000 165,995,000 251,358,000 246,727,000 143,293,000 79,734,000 74,614,000 70,563,000 58,110,000 37,976,000 32,502,000 28,828,000 
        total assets
      2,654,900,000  2,134,200,000 1,949,000,000 1,954,500,000  1,896,900,000 1,805,200,000                                                                   2,484,371,000               
        liabilities and shareholders’ equity
                                                                                               
        liabilities:
                                                                                               
        accounts payable, trade
      196,100,000 187,200,000 207,400,000 197,700,000 201,700,000 187,300,000 240,900,000 200,300,000 180,500,000 249,500,000 221,400,000 191,200,000 149,200,000 167,300,000 170,900,000 229,500,000 202,800,000 186,500,000 165,300,000 133,600,000 116,200,000 106,100,000 85,600,000 87,700,000 87,100,000 97,100,000 112,000,000 98,300,000 113,200,000 119,400,000 113,900,000 124,000,000 95,800,000 89,931,000 97,032,000 92,131,000 88,701,000 94,960,000 85,314,000 89,303,000 84,587,000 90,489,000 109,262,000 119,334,000 140,093,000 151,443,000 89,918,000 95,897,000 99,975,000 108,490,000 105,950,000 103,867,000 75,796,000 75,370,000 78,272,000 70,360,000 74,986,000 86,172,000 84,850,000 87,595,000 83,134,000 88,004,000 74,942,000 69,739,000 74,993,000 77,301,000 82,412,000 66,344,000 80,189,000 102,143,000 106,908,000 100,913,000 93,272,000 79,482,000 72,859,000 70,070,000 84,471,000 64,849,000    61,919,000    47,479,000 52,607,000 43,583,000 34,829,000 
        accrued compensation and benefits
      71,800,000 74,400,000 52,400,000 44,200,000 40,600,000 49,800,000 41,500,000 38,200,000 34,000,000 38,100,000 42,200,000 42,300,000                                                                              
        due to affiliates
      51,000,000 70,800,000 77,100,000 100,700,000 122,600,000 109,300,000 104,500,000 108,300,000 131,800,000 101,400,000 60,300,000 13,800,000 22,600,000 17,000,000 15,100,000 26,600,000 88,300,000 65,800,000 87,100,000 50,700,000 39,700,000 21,700,000 2,900,000 1,800,000 29,500,000 32,900,000  13,500,000 3,100,000 10,300,000 17,600,000 2,600,000 14,600,000 20,369,000 23,657,000 19,092,000 20,020,000 15,368,000 13,105,000 9,662,000 6,173,000 10,045,000 33,655,000 63,667,000 50,033,000 22,261,000 64,917,000 52,356,000 74,379,000 53,582,000 71,739,000 67,345,000 50,210,000 39,737,000 42,665,000 43,055,000 41,544,000 41,904,000 44,905,000 39,548,000 42,660,000 45,381,000 37,577,000 33,329,000 39,309,000 32,708,000 26,517,000 64,023,000 62,920,000 70,957,000 104,303,000 348,614,000 336,992,000 216,754,000 225,960,000 279,820,000 279,318,000 282,282,000 227,004,000 221,650,000 207,755,000 158,682,000 78,391,000 44,574,000 97,030,000 84,815,000 57,702,000 32,657,000 27,139,000 
        accrued and other current liabilities
      27,000,000 35,600,000 73,600,000 44,900,000 36,600,000 42,000,000 43,700,000 49,500,000 46,300,000 50,900,000 61,600,000 66,600,000 53,600,000 60,700,000 66,000,000 71,300,000 63,000,000 62,700,000 61,300,000 54,800,000 62,300,000 59,400,000 69,500,000 76,900,000 50,600,000 65,500,000 66,100,000 55,900,000 59,200,000 52,500,000 65,900,000 64,400,000 68,000,000 61,398,000 56,732,000 45,679,000 58,094,000 50,100,000 59,382,000 48,479,000 50,169,000 48,822,000 71,465,000 67,162,000 107,374,000 104,646,000 46,007,000 45,182,000 51,644,000 69,466,000 72,921,000 81,172,000 49,001,000 40,099,000 52,913,000 44,716,000 48,917,000 40,776,000 58,704,000 49,225,000 46,535,000 41,495,000 36,079,000 32,016,000 36,618,000 38,598,000 48,867,000 61,262,000 64,172,000 58,777,000 86,184,000 88,723,000 56,357,000 60,482,000 44,250,000 68,473,000 55,549,000 75,143,000 55,644,000 52,691,000 47,598,000 53,715,000 36,870,000 59,258,000 49,221,000 53,309,000 44,237,000 46,401,000 30,154,000 
        derivative liabilities
      104,000,000 58,200,000 37,500,000 19,400,000 10,200,000 4,400,000 5,100,000 2,700,000 400,000 1,400,000 2,900,000 3,600,000 5,400,000 9,700,000 22,600,000 49,400,000 122,200,000 102,100,000 123,500,000 88,000,000 62,800,000    34,500,000                                                                 
        carbon credit repurchase liability
      28,700,000 28,600,000                                                                                        
        current maturities of long-term debt
      66,100,000 68,800,000 139,300,000 36,500,000 28,300,000 70,900,000 26,500,000 19,100,000 65,900,000 38,300,000 84,000,000                                                                               
        total current liabilities
      544,700,000 523,600,000 599,100,000 451,100,000 447,400,000 463,700,000 472,300,000 428,100,000 468,900,000 763,000,000 634,000,000 573,400,000 368,900,000 410,700,000 406,100,000 444,800,000 574,000,000 547,400,000 515,500,000 394,400,000 364,300,000 240,300,000 201,200,000 249,600,000 284,900,000 233,700,000 212,300,000 204,600,000 229,600,000 224,300,000 230,500,000 209,800,000 197,200,000 190,517,000 195,680,000 175,484,000 185,544,000 179,160,000 174,900,000 165,265,000 158,798,000 167,319,000 232,108,000 267,720,000 315,373,000 296,324,000 217,329,000 209,783,000 242,242,000 247,763,000 278,088,000 278,219,000 201,490,000 181,704,000 198,876,000 182,053,000 189,450,000 193,365,000 213,005,000 200,092,000 242,197,000 254,860,000 216,837,000 203,268,000 215,518,000 212,658,000 322,973,000 368,218,000 381,857,000 426,762,000 491,872,000 732,724,000 681,433,000 551,530,000 536,967,000 612,879,000 627,847,000 646,277,000 563,715,000 541,873,000 524,698,000 467,045,000 367,274,000 343,592,000 403,703,000 387,458,000 351,601,000 152,212,000 108,871,000 
        long-term debt
      479,800,000 479,500,000 479,200,000 442,300,000 444,300,000 447,300,000  451,300,000 452,100,000 430,900,000 418,000,000                                                                               
        accrued benefits costs - less current portion
      97,500,000 97,700,000 121,800,000 127,800,000 129,300,000 130,400,000 119,200,000 120,200,000 121,300,000 120,300,000                                                                                
        other liabilities
      116,900,000 104,900,000 102,700,000 96,800,000 95,700,000 92,600,000 98,400,000 99,400,000 97,100,000 66,300,000 53,500,000 11,100,000 37,100,000 36,000,000 39,700,000 52,400,000 51,000,000 46,300,000 48,200,000 47,500,000 67,300,000 44,800,000 46,200,000 47,800,000 47,100,000 42,400,000 45,400,000 47,900,000 48,400,000 46,000,000 50,800,000 57,600,000 54,500,000 57,927,000 62,094,000 66,840,000 64,608,000 72,026,000 72,330,000 53,102,000 51,799,000 53,009,000 47,580,000 46,596,000 47,990,000 53,272,000 38,879,000 37,416,000 36,984,000 37,743,000 37,184,000 37,056,000 25,278,000 40,162,000 39,720,000 39,690,000 39,466,000 40,005,000 40,739,000 41,662,000 34,942,000 37,612,000 25,560,000 27,239,000 26,824,000 31,604,000 35,730,000 41,757,000 42,023,000 33,464,000 52,886,000 57,191,000 56,788,000 39,643,000 40,686,000 42,067,000 42,974,000 27,811,000 28,395,000 28,420,000 28,988,000 28,010,000 33,290,000 35,459,000 33,740,000 34,961,000 34,879,000 35,200,000 33,372,000 
        deferred taxes
      60,600,000 58,400,000 70,100,000 73,500,000 72,700,000 71,200,000 75,100,000 73,400,000 73,000,000 72,400,000   103,700,000 103,100,000 111,800,000 92,300,000 60,500,000 58,700,000 48,900,000 42,800,000 86,300,000 89,200,000 94,600,000 94,700,000 94,700,000 95,100,000 98,700,000 100,500,000 102,100,000 104,300,000 107,100,000 102,300,000 100,500,000 103,476,000 109,632,000 108,988,000 109,510,000 108,939,000 88,449,000 90,464,000 93,399,000  14,281,000 14,281,000 14,281,000 14,281,000 13,614,000 13,614,000 13,614,000 106,218,000 111,922,000 111,318,000 110,361,000 110,252,000 90,403,000 90,832,000 90,807,000 90,958,000 85,971,000 86,019,000 85,992,000 85,999,000 91,546,000 90,822,000 85,933,000 81,622,000 66,432,000 65,252,000 65,443,000 71,805,000 69,561,000 54,240,000 69,744,000 62,931,000 59,860,000 54,205,000 47,461,000 41,587,000 16,890,000 16,890,000 16,890,000 16,890,000 74,485,000 94,778,000 73,909,000 68,273,000 57,610,000 68,310,000 55,094,000 
        asset retirement obligations - less current portion
      70,900,000 75,300,000 63,900,000 63,200,000 64,400,000 61,500,000 54,100,000 49,900,000 50,400,000 49,500,000                                                                                
        total noncurrent liabilities
      825,700,000 815,800,000 837,700,000 813,600,000 816,400,000 813,000,000 796,100,000 794,200,000 793,900,000 739,400,000 740,300,000 769,100,000 667,800,000 662,000,000 660,900,000 661,200,000 674,900,000 601,500,000 653,500,000 640,600,000 590,800,000 613,200,000 611,800,000 625,700,000 632,400,000 591,000,000 589,600,000 601,300,000 572,700,000 551,000,000 549,700,000 554,000,000 553,200,000 561,481,000 594,689,000 599,384,000 597,519,000 604,512,000 576,292,000 559,888,000 561,956,000 567,279,000 603,323,000 604,978,000 628,728,000 626,564,000 567,821,000 563,064,000 561,497,000 559,621,000 616,022,000 604,061,000 597,616,000 611,979,000 574,912,000 576,749,000 577,232,000 579,452,000 517,696,000 521,928,000 510,292,000 513,680,000 557,261,000 594,828,000 583,823,000 581,362,000 560,101,000 564,119,000 587,266,000 649,816,000 580,859,000 1,887,276,000 1,785,807,000 1,465,537,000 1,312,261,000 1,291,633,000 1,399,077,000 1,409,247,000 1,040,924,000 1,285,645,000 1,290,694,000 977,831,000 740,598,000 655,032,000 638,950,000 560,595,000 536,640,000 698,645,000 513,758,000 
        commitments and contingencies
                                                                                               
        shareholders’ equity:
                                                                                               
        preferred stock
                                       1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000                          2,000 2,000 2,000 2,000 2,000                   
        common stock
      1,100,000 1,100,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 900,000 900,000 900,000 947,000 945,000 945,000 944,000 944,000 942,000 942,000 942,000 942,000 941,000 941,000 939,000 939,000 937,000 936,000 936,000 935,000 935,000 934,000 934,000 933,000 933,000 933,000 932,000 932,000 932,000 932,000 931,000 928,000 927,000 927,000 927,000 925,000 761,000 742,000 741,000 491,000 490,000 412,000 411,000 410,000 410,000 410,000 326,000 325,000 325,000 324,000 324,000 322,000 322,000 321,000 321,000 320,000 320,000 317,000 211,000 
        additional paid-in capital
      2,572,700,000 2,571,500,000 2,553,000,000 2,552,000,000 2,550,800,000 2,550,200,000 2,546,300,000 2,544,700,000 2,543,700,000 2,542,900,000 2,541,800,000 2,541,000,000 2,540,200,000 2,539,600,000 2,537,600,000 2,537,000,000 2,536,000,000 2,535,500,000 2,528,000,000 2,527,000,000 2,530,900,000 2,530,000,000 2,528,400,000 2,527,600,000 2,526,600,000 2,526,500,000 2,524,800,000 2,524,300,000 2,523,300,000 2,523,000,000 2,519,500,000 2,518,800,000 2,518,100,000 2,517,385,000 2,516,866,000 2,516,363,000 2,515,647,000 2,515,131,000 2,514,765,000 2,514,227,000 2,513,952,000 2,513,631,000 2,513,168,000 2,512,682,000 2,510,665,000 2,510,261,000 2,509,631,000 2,509,186,000 2,508,882,000 2,508,574,000 2,508,456,000 2,507,996,000 2,507,671,000 2,507,454,000 2,507,254,000 2,507,053,000 2,506,987,000 2,506,842,000 2,506,655,000 2,506,435,000 2,504,391,000 2,503,907,000 2,505,094,000 2,504,165,000 2,503,263,000 2,501,389,000 2,392,505,000 2,378,436,000 2,377,310,000 2,240,014,000 2,239,005,000 867,106,000 864,797,000 857,787,000 854,545,000 853,273,000 437,375,000 432,270,000 431,153,000 429,797,000 427,668,000 419,009,000 418,876,000 418,412,000 416,400,000 415,453,000 414,642,000 409,568,000 173,138,000 
        treasury stock
      -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,300,000 -86,276,000 -86,276,000 -86,276,000 -86,276,000 -86,276,000 -86,276,000 -86,276,000 -86,276,000 -86,276,000 -86,276,000 -86,276,000 -76,385,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -49,924,000 -45,891,000 -38,806,000                               
        accumulated other comprehensive loss
      -48,500,000 -55,200,000 -98,600,000 -100,100,000 -101,600,000 -103,300,000 -96,400,000 -98,100,000 -99,600,000 -97,900,000 -89,000,000 -90,700,000 -92,900,000 -94,000,000 -88,200,000 -80,900,000 -81,700,000 -82,300,000 -115,200,000 -116,400,000 -117,500,000 -118,800,000 -106,500,000 -107,600,000 -108,400,000 -109,800,000 -98,000,000 -98,700,000 -99,700,000 -98,700,000 -88,700,000 -88,700,000 -91,300,000 -91,742,000 -111,965,000 -113,012,000 -113,181,000 -113,893,000 -110,179,000 -111,003,000 -111,827,000 -112,650,000 -101,866,000 -98,242,000 -117,604,000 -117,682,000 -92,017,000 -91,864,000 -91,733,000 -91,832,000 -138,680,000 -139,163,000 -150,297,000 -151,192,000 -130,893,000 -132,067,000 -133,832,000 -134,588,000 -77,901,000 -78,234,000 -61,333,000 -49,976,000 -37,993,000 -78,072,000 -73,696,000 -74,270,000 -61,711,000 -67,257,000 -100,190,000 -137,208,000 -73,785,000 -43,302,000 -46,013,000 -51,531,000 -86,653,000 -111,890,000 -136,715,000 -166,572,000 -98,867,000 -119,816,000 -123,389,000 -91,418,000 -33,388,000 -20,626,000 -68,354,000 -52,186,000 -27,103,000 -14,556,000  
        accumulated deficit
      -1,288,100,000 -1,625,500,000 -1,627,300,000 -1,642,200,000 -1,637,600,000 -1,667,200,000 -1,712,500,000 -1,759,800,000 -1,757,300,000 -2,004,100,000 -2,034,100,000 -1,992,100,000 -1,999,600,000 -1,961,000,000 -1,847,500,000 -1,891,800,000 -1,929,200,000 -1,946,900,000 -2,007,300,000 -1,954,900,000 -1,919,800,000 -1,779,800,000 -1,744,200,000 -1,686,000,000 -1,659,100,000 -1,656,400,000 -1,651,600,000 -1,630,900,000 -1,610,200,000 -1,576,800,000 -1,511,900,000 -1,491,600,000 -1,511,000,000 -1,510,672,000 -1,546,477,000 -1,567,260,000 -1,574,391,000 -1,559,252,000 -1,381,729,000 -1,323,456,000 -1,313,941,000 -1,297,778,000 -1,254,698,000 -1,212,566,000 -1,178,669,000 -1,252,448,000 -1,314,297,000 -1,364,702,000 -1,385,046,000 -1,364,942,000 -1,355,267,000 -1,350,949,000 -1,316,376,000 -1,324,629,000 -1,317,720,000 -1,305,697,000 -1,293,420,000 -1,289,019,000 -1,257,912,000 -1,251,312,000 -1,275,298,000 -1,300,344,000 -1,365,624,000 -1,348,837,000 -1,353,983,000 -1,360,315,000 -1,335,961,000 -1,376,103,000 -1,268,957,000 -1,143,778,000 -443,626,000 -480,599,000 -478,258,000 -245,462,000 -133,159,000 -140,629,000 -79,964,000 -136,313,000 -17,190,000 -191,129,000 -236,929,000      -1,702,000  -5,430,000 
        total century shareholders’ equity
      1,150,900,000 805,600,000 741,800,000 724,400,000 726,300,000 694,400,000 652,100,000 601,500,000 601,500,000 355,600,000 333,400,000 372,900,000                                                                              
        noncontrolling interests
      133,600,000  -44,400,000 -40,100,000 -35,600,000  -23,600,000 -18,600,000 -14,400,000                                                                                 
        total equity
      1,284,500,000 929,900,000 697,400,000 684,300,000 690,700,000 662,700,000 628,500,000 582,900,000 587,100,000 344,100,000 386,700,000 404,800,000                                                                              
        total liabilities and equity
      2,654,900,000  2,134,200,000 1,949,000,000 1,954,500,000                                                                                     
        total
       2,269,300,000    1,939,400,000   1,849,900,000 1,846,500,000 1,761,000,000 1,747,300,000 1,399,100,000 1,472,000,000 1,583,600,000 1,585,000,000 1,688,700,000 1,569,900,000 1,489,200,000 1,405,400,000 1,363,400,000 1,399,600,000 1,405,400,000 1,524,000,000 1,591,100,000 1,499,700,000 1,491,800,000 1,515,300,000 1,530,400,000 1,537,500,000 1,613,700,000 1,616,900,000 1,580,800,000 1,581,641,000 1,563,463,000 1,525,629,000 1,525,807,000 1,540,327,000 1,688,716,000 1,719,588,000 1,723,605,000 1,752,468,000 1,906,701,000 1,989,238,000 2,083,048,000 2,014,035,000 1,839,481,000 1,776,480,000 1,786,855,000 1,810,196,000 1,859,631,000 1,851,175,000 1,791,115,000 1,776,326,000 1,783,439,000 1,779,101,000 1,797,426,000 1,811,094,000 1,863,670,000 1,899,842,000 1,921,181,000 1,923,056,000 1,876,503,000 1,876,280,000 1,875,853,000 1,861,750,000 1,878,670,000 1,868,157,000 1,978,029,000 2,036,099,000 2,794,817,000 2,963,617,000 2,808,177,000 2,578,271,000  2,505,676,000 2,247,946,000 2,185,234,000 1,920,060,000 1,946,694,000 1,883,066,000  1,546,982,000 1,470,102,000 1,421,361,000  1,274,398,000 1,260,533,000  
        long-term debt due to affiliates
         10,000,000 10,000,000 10,000,000     10,000,000                                                                               
        noncontrolling interest
       124,300,000    -31,700,000    -11,500,000 53,300,000 31,900,000                                                                              
        non-trade payables
        11,800,000                                                                                       
        non-trade payable
         7,700,000 7,400,000                                                                                     
        deferred credit - preliminary bargain purchase gain
               273,400,000 161,600,000 103,300,000                                                                              
        current debt due to affiliates
            10,100,000 10,000,000 10,000,000 10,000,000                                                                                
        due to affiliates - less current portion
                1,700,000 1,500,000 5,900,000 8,300,000 4,500,000 9,400,000 52,900,000 21,900,000 22,400,000 14,300,000 6,500,000 100,000                                                       502,669,000 554,864,000            
        long-term debt - net
            449,300,000                                                                                   
        total liabilities
            1,268,400,000 1,222,300,000                                                                                  
        total liabilities and shareholders' equity
            1,896,900,000 1,805,200,000                                                                                  
        accrued benefits - less current portion
                112,600,000 116,800,000                                                                              
        deferred tax liabilities
                83,900,000 93,000,000                                                                              
        asset retirement obligations
                60,600,000 124,100,000                                                                              
        deferred tax assets
                 110,800,000                                                                              
        iceland term facility
                 8,600,000 12,300,000 13,300,000                                                                            
        u.s. revolving credit facility
                 63,200,000 63,100,000 90,000,000 63,500,000 15,000,000 35,300,000 63,600,000 17,300,000 39,600,000 50,400,000  5,000,000 45,000,000 45,000,000                                                                 
        iceland revolving credit facility
                 73,000,000 45,000,000 35,000,000 50,000,000 35,000,000 35,000,000 50,000,000 30,000,000   45,000,000 45,000,000 45,000,000 45,000,000                                                                 
        industrial revenue bonds
                 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,800,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 7,815,000 
        senior notes payable
                 247,000,000 246,800,000 246,600,000 246,400,000 246,200,000 246,000,000 245,800,000 245,600,000 245,400,000 243,400,000 243,100,000 242,800,000 249,500,000 249,300,000 249,200,000 249,000,000 248,900,000 248,800,000 248,600,000 248,500,000 248,400,000 248,300,000 248,153,000 248,036,000 247,922,000 247,809,000 247,699,000 247,590,000 247,484,000 247,380,000 247,278,000 247,178,000 247,079,000 246,983,000 246,888,000 246,796,000 246,705,000 246,615,000 246,528,000 246,442,000 248,961,000 250,861,000 250,582,000 250,303,000 250,036,000 249,769,000 249,512,000 249,256,000 249,011,000 248,765,000 248,530,000 248,295,000 248,069,000 247,843,000 247,624,000                        
        convertible senior notes payable
                 84,500,000 84,500,000 84,400,000 84,300,000 84,200,000 84,100,000 84,000,000 83,900,000 83,800,000                                                                      
        grundartangi casthouse debt facility
                 69,300,000 59,300,000 49,400,000 39,400,000 39,400,000 39,400,000                                                                         
        iceland term facility, net of current portion
                   1,200,000                                                                            
        leases - right of use liabilities
                 21,800,000 21,500,000 20,900,000 19,800,000 20,900,000 22,400,000 22,900,000 22,500,000 23,100,000 23,200,000 24,300,000 23,400,000 21,700,000 21,900,000 22,800,000 21,900,000 23,500,000 22,800,000                                                             
        accrued employee benefits costs
                  9,900,000 9,900,000 10,200,000 10,200,000 10,200,000 8,900,000 9,500,000 9,900,000 10,100,000 10,300,000 10,400,000 10,400,000 10,400,000 10,400,000 11,000,000 11,000,000 11,000,000 11,000,000 11,000,000 11,000,000 11,000,000 11,004,000 10,444,000 10,767,000 10,914,000 10,917,000 9,284,000 10,006,000 10,054,000 10,148,000 9,911,000 9,742,000 10,058,000 10,159,000 8,672,000 8,533,000 8,429,000 8,410,000 17,060,000                                       
        accrued pension benefits costs - less current portion
                  41,800,000 44,500,000 24,100,000 25,000,000 26,000,000 28,600,000 57,700,000 60,200,000 63,000,000 65,200,000 56,000,000 57,700,000 59,300,000 60,800,000 48,400,000 49,000,000 49,900,000 50,900,000 34,200,000 35,700,000 37,400,000 38,929,000 46,835,000 47,601,000 48,863,000 49,493,000 42,433,000 42,935,000 43,437,000                                                 
        accrued postretirement benefits costs - less current portion
                  67,200,000 67,600,000 90,900,000 91,400,000 92,600,000 93,300,000 100,400,000 100,700,000 101,100,000 101,500,000 98,800,000 99,300,000 100,100,000 100,700,000 101,200,000 101,500,000 100,700,000 101,200,000 109,100,000 110,000,000 112,500,000 112,996,000 128,092,000 128,033,000 126,729,000 126,355,000 125,490,000 125,903,000 125,941,000                                                 
        total shareholders’ equity
                  362,400,000 399,300,000 516,600,000 479,000,000 439,800,000 421,000,000 320,200,000 370,400,000 408,300,000 546,100,000 592,400,000 648,700,000 673,800,000 675,000,000 689,900,000 709,400,000 728,100,000 762,200,000 833,500,000 853,100,000 830,400,000 829,643,000 773,094,000 750,761,000 742,744,000 756,655,000 937,524,000 994,435,000 1,002,851,000 1,017,870,000 1,071,270,000 1,116,540,000 1,138,947,000 1,091,147,000 1,054,331,000 1,003,633,000 983,116,000 1,002,812,000 965,521,000 968,895,000 992,009,000 982,643,000 1,009,651,000 1,020,299,000 1,030,744,000 1,038,277,000 1,132,969,000 1,177,822,000 1,168,692,000 1,154,516,000 1,102,405,000 1,078,184,000 1,076,512,000 1,067,730,000 995,596,000 935,820,000 1,008,906,000 959,521,000 1,722,086,000 343,617,000 340,937,000 561,204,000 635,143,000 601,164,000 221,022,000 129,710,000 315,421,000 119,176,000 67,674,000 232,555,000 439,110,000 471,478,000 378,708,000 382,817,000 386,157,000 409,676,000 187,697,000 
        derivative assets, current
                    198,100,000                                                                           
        due from affiliates - less current portion
                    200,000       1,700,000 1,300,000 3,900,000 5,100,000 500,000 1,400,000                                                               
        derivative assets - less current portion
                    29,900,000                                                                           
        interest payable
                      9,400,000  8,700,000   15,000,000                                                                    
        hawesville term loan
                        5,000,000 10,000,000 15,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000                                                                
        iceland revolving credit facility - less current portion
                                                                                               
        derivative liabilities - less current portion
                        23,900,000 22,800,000                                                                      
        hawesville term loan - less current portion
                            5,000,000 10,000,000 15,000,000 20,000,000                                                                
        leases - right of use assets
                                24,200,000 24,300,000 24,600,000                                                             
        term loan - current
                                15,000,000 10,000,000                                                              
        revolving credit facility
                                400,000 8,100,000 35,300,000 23,300,000 14,300,000                    16,725,000                   25,000,000           5,100,000 8,069,000        
        term loan - less current portion
                                25,000,000 30,000,000                                                              
        assets held for sale
                                           22,313,000 23,239,000 29,695,000 29,715,000 30,697,000 32,067,000                                               
        accounts receivable — net
                                               9,475,000 8,613,000 9,807,000 3,464,000 76,165,000 50,576,000 52,253,000 45,619,000 56,184,000 51,247,000 84,067,000 52,312,000 50,667,000 44,327,000 71,936,000 50,531,000 47,647,000 52,067,000 54,838,000 36,383,000 43,903,000 38,979,000 36,693,000 35,392,000 37,706,000 44,661,000 34,609,000 34,517,000 60,859,000 115,854,000 94,493,000 99,807,000 93,451,000 100,127,000 111,153,000 112,924,000 113,371,000 82,388,000 118,191,000 98,656,000 83,016,000  104,575,000  79,576,000   51,370,000 
        property, plant and equipment — net
                                               1,232,256,000 1,251,476,000 1,263,861,000 1,285,845,000 1,291,218,000 1,221,705,000 1,230,014,000 1,239,893,000 1,247,661,000 1,239,201,000 1,230,031,000 1,180,770,000 1,188,214,000 1,197,644,000 1,208,029,000 1,206,106,000 1,218,225,000 1,224,319,000 1,238,651,000 1,246,530,000 1,256,970,000 1,263,730,000 1,274,199,000 1,284,904,000 1,298,288,000 1,307,855,000 1,319,899,000 1,329,956,000 1,340,037,000 1,300,932,000 1,278,406,000 1,260,687,000 1,260,040,000 1,259,776,000 1,251,952,000 1,230,084,000 1,218,777,000 1,189,182,000 1,155,732,000 1,124,584,000 1,070,158,000  916,008,000  806,250,000   494,957,000 
        accrued pension benefits costs — less current portion
                                               43,999,000 60,224,000 56,711,000 57,722,000 59,906,000 40,322,000 41,724,000 39,981,000 39,848,000 59,724,000 63,748,000 67,322,000 67,878,000 65,151,000 67,762,000 68,271,000 70,899,000 35,963,000 38,518,000 36,881,000 37,795,000 42,757,000 42,073,000 44,072,000 43,281,000 44,622,000 45,307,000 49,336,000 50,008,000 14,876,000 14,709,000 14,561,000 14,427,000 15,987,000 20,789,000 19,912,000 19,239,000 10,953,000 10,904,000 10,638,000 10,350,000  12,358,000  10,685,000   10,764,000 
        accrued postretirement benefits costs — less current portion
                                               125,999,000 135,665,000 136,020,000 153,586,000 152,894,000 129,130,000 128,287,000 131,196,000 129,284,000 144,025,000 142,978,000 143,794,000 143,105,000 129,335,000 128,429,000 128,919,000 128,078,000 105,767,000 106,718,000 103,712,000 103,744,000 149,103,000 186,625,000  177,231,000 163,317,000 161,803,000 180,464,000 219,539,000 193,536,000 191,093,000 187,958,000 184,853,000 209,092,000 214,772,000 210,885,000 206,415,000 107,062,000 103,245,000 99,875,000 96,660,000 94,066,000 91,296,000 88,378,000 85,549,000 84,871,000 83,411,000 78,218,000 
        series a preferred stock
                                               1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000                        
        deferred taxes — current portion
                                                       13,614,000                    32,290,000 60,299,000 111,931,000 99,246,000 69,858,000 116,042,000 120,196,000 95,567,000 103,110,000 70,831,000 53,281,000 50,475,000 37,705,000  23,458,000  25,688,000   3,413,000 
        deferred taxes - current portion
                                                        19,720,000 19,613,000 19,726,000 19,726,000                                    
        current portion of long-term debt
                                                        2,603,000                                  10,589,000  5,945,000 13,460,000  
        accrued employee benefits costs — current portion
                                                         18,020,000 18,668,000 18,683,000 17,211,000 16,107,000 16,188,000 16,698,000 16,731,000 15,909,000 15,985,000 26,682,000 15,517,000 16,027,000 12,997,000 12,997,000 12,070,000 12,070,000 12,070,000 12,070,000 11,662,000 11,659,000 11,997,000 11,997,000 11,083,000 11,083,000 11,083,000 11,083,000 9,333,000 9,333,000 9,333,000 9,333,000 8,458,000 8,458,000 8,458,000 8,458,000 8,295,000 8,296,000 8,934,000 
        due from affiliates – less current portion
                                                                 3,094,000 7,172,000 6,054,000 6,982,000 9,828,000 8,968,000 5,859,000 7,599,000 7,599,000 7,599,000 7,599,000 9,353,000                   
        convertible senior notes
                                                                  46,068,000 45,483,000 44,907,000 44,342,000 43,786,000 43,239,000 145,292,000 156,704,000 154,691,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000   
        contingencies and commitments
                                                                                               
        accrued post retirement benefits costs — less current portion
                                                                      179,151,000                         
        cash
                                                                       198,234,000 196,337,000 230,031,000 267,492,000 129,400,000 129,055,000 351,644,000 105,550,000 60,962,000 64,776,000 187,727,000              
        short-term investments
                                                                           13,686,000 29,285,000 31,937,000 261,255,000 280,169,000 258,727,000 121,681,000              
        intangible asset — net
                                                                         24,453,000 28,490,000 32,527,000 36,296,000 40,065,000 43,834,000 47,603,000 51,101,000 54,599,000 58,097,000 61,594,000 64,856,000 68,118,000 71,381,000 74,643,000  81,989,000  86,809,000 89,891,000  99,136,000 
        senior unsecured notes payable
                                                                        250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000   250,000,000   
        goodwill
                                                                            94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 94,844,000 95,610,000 107,259,000 107,259,000  
        deferred taxes – less current portion
                                                                            581,405,000 514,437,000 456,136,000 321,068,000                
        due to affiliates – less current portion
                                                                             1,320,043,000 1,206,756,000 913,683,000 716,636,000 655,782,000     605,416,000  78,735,000  64,477,000  9,978,000 7,107,000  
        restricted cash equivalents
                                                                              873,000                 
        long term debt — current portion
                                                                                 618,000 14,611,000 30,105,000 30,099,000 16,093,000 16,087,000 581,000    10,582,000    
        nordural debt
                                                                                20,000,000 54,018,000 325,176,000 309,331,000 289,484,000 283,636,000 273,787,000 230,436,000 196,601,000 153,739,000 117,376,000 80,711,000 77,425,000 170,472,000  
        total liabilities and shareholders’ equity
                                                                                2,484,371,000               
        assets:
                                                                                               
        accounts payable — trade
                                                                                    58,820,000 59,291,000 61,110,000   47,926,000      
        due to affiliates — less current portion
                                                                                    338,140,000 592,550,000  337,416,000  17,402,000  30,416,000    
        retained earnings
                                                                                       -95,358,000 53,300,000 73,371,000 30,341,000 19,230,000  14,347,000  
        current assets:
                                                                                               
        accounts receivable – net
                                                                                        80,510,000  87,778,000  70,478,000 68,399,000  
        deferred taxes – current portion
                                                                                        14,294,000  34,370,000  12,796,000 6,133,000  
        property, plant and equipment – net
                                                                                        995,236,000  863,248,000  754,207,000 743,614,000  
        intangible asset – net
                                                                                        78,316,000  85,663,000   92,972,000  
        current liabilities:
                                                                                               
        accounts payable – trade
                                                                                        60,182,000  55,590,000     
        long-term debt – current portion
                                                                                        558,000       
        accrued pension benefits costs – less current portion
                                                                                        13,421,000  11,070,000  12,003,000 11,584,000  
        due from affiliates — less current portion
                                                                                         2,747,000      
        long-term debt — current portion
                                                                                         561,000      
        senior unsecured notes
                                                                                          250,000,000     
        senior secured notes payable — less current portion
                                                                                               
        senior unsecured notes payable — net
                                                                                           250,000,000    
        notes payable — affiliates
                                                                                               
        convertible preferred stock
                                                                                              25,000,000 
        senior secured notes payable– net
                                                                                            9,874,000 322,561,000  
        senior secured notes payable — net
                                                                                              322,310,000 
        notes payable —affiliates
                                                                                              14,000,000 
        minority interest
                                                                                               
        accumulated other comprehensive income
                                                                                              -5,222,000 
      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 2021-12-31 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 2004-12-31 2004-09-30 
                                                                                               
          cash flows from operating activities:
                                                                                               
          net income
        327,000,000 -11,400,000 10,600,000 -9,100,000 25,700,000 40,400,000 42,300,000 -6,700,000 244,700,000  -45,900,000 6,600,000 -38,600,000  44,300,000 37,400,000 17,700,000 60,400,000 -52,400,000 -35,100,000 -140,000,000 -35,500,000 -58,200,000 -26,900,000 -2,700,000 -4,800,000 -20,700,000 -20,700,000 -34,600,000 -65,000,000 -20,300,000   35,805,000      -9,515,000 -16,163,000 -43,080,000 -56,112,000 -33,897,000 73,779,000 61,849,000 50,405,000 20,344,000 -20,104,000    8,253,000 -6,909,000 -12,023,000 -12,277,000 -4,401,000 -31,107,000 -6,600,000 23,986,000 25,046,000   5,146,000 6,332,000      36,973,000 -2,341,000 -232,796,000  7,470,000 -60,665,000 64,249,000 -119,123,000 173,939,000 45,800,000 -141,571,000 -148,658,000 -20,071,000 41,347,000 11,127,000 20,932,000 -16,049,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                                               
          unrealized loss on derivative instruments
        48,000,000 27,600,000 20,700,000 11,500,000 3,000,000 -5,800,000 4,500,000 2,700,000 -6,400,000 2,900,000 17,900,000 1,900,000 64,400,000   -253,000,000 35,500,000  33,100,000 33,100,000 94,400,000  5,900,000 100,000 -3,700,000  -10,100,000 -6,400,000 5,600,000                                                           
          depreciation, depletion and amortization
        22,700,000 30,200,000 20,200,000 20,700,000 20,700,000 17,000,000 23,100,000 21,800,000 19,900,000 19,400,000                                                                              
          share-based compensation
        9,400,000 32,800,000                                                                                      
          net periodic benefit cost
        9,500,000                                                                                       
          change in deferred tax provision
        2,200,000 -12,500,000 -3,600,000 1,200,000 1,200,000                                                                                   
          gain on the sale of hawesville
        -287,900,000                                                                                       
          gain on insurance proceeds received for property damage
        -1,000,000                                                                                       
          other non-cash items - net
        900,000 1,400,000 -600,000   4,400,000 4,200,000 2,000,000 -1,500,000 4,600,000 -4,900,000 4,200,000 -500,000    -1,700,000 -4,300,000 -1,600,000 1,000,000 3,200,000 -2,400,000 -400,000 2,600,000 -700,000 -800,000 -600,000 -4,500,000 -9,200,000 4,200,000 -3,600,000 -4,600,000                                                       
          change in operating assets and liabilities:
                                                                                               
          accounts receivable
        -8,900,000  -12,100,000                                                                                     
          non-trade receivables
        1,000,000   -3,800,000 15,400,000 24,400,000 8,700,000 -6,800,000 5,200,000                                                                               
          manufacturing credit receivable
        -25,600,000 47,800,000 -25,400,000 -22,400,000 -20,700,000 -20,700,000 -48,100,000 -11,200,000 -12,600,000                                                                               
          due from affiliates
        -23,000,000 -13,900,000 -1,900,000 -5,400,000 16,700,000 -13,200,000 -4,500,000 15,400,000 -2,600,000 -2,500,000 -800,000 -500,000 -11,700,000 9,200,000 3,100,000 1,600,000 -10,300,000 2,400,000 14,900,000 -4,400,000 -12,200,000 5,900,000 -6,700,000 1,400,000 20,200,000 -6,900,000 -1,800,000 2,700,000 -1,100,000 -2,300,000 -13,900,000 2,100,000 1,700,000 1,483,000 -1,354,000 1,294,000 4,862,000 -2,380,000 240,000 967,000 1,939,000 11,680,000 23,213,000 32,752,000 -53,559,000 20,950,000 1,642,000 2,037,000 -12,545,000 -18,632,000 9,000 18,597,000 -5,691,000 1,885,000 -5,084,000 5,650,000 -249,000 4,092,000 -4,663,000 2,499,000 8,766,000 -17,857,000 -3,663,000 4,089,000 -20,760,000 -1,385,000 -1,989,000 -1,905,000 26,904,000 -2,598,000 -3,176,000 1,918,000 -8,513,000 1,001,000 10,305,000 -15,530,000 15,074,000 -9,342,000 -12,565,000 6,067,000 -3,064,000  -3,573,000 225,000 102,000  -287,000 
          inventories
        6,800,000 27,400,000 -44,100,000 27,600,000 -100,000 3,200,000 -76,900,000 16,600,000 -7,200,000 -500,000 44,800,000 22,600,000 -41,100,000 -8,700,000 38,900,000 -42,100,000 -900,000 -82,300,000 -11,800,000 -28,600,000 -11,800,000 -27,800,000 3,900,000 18,800,000 -10,400,000 -1,300,000 14,600,000 -25,300,000 16,400,000 16,000,000 -36,500,000 -32,300,000 -10,000,000 -43,443,000 -7,145,000 -12,269,000 -4,677,000 2,184,000 -3,736,000 -15,177,000 17,648,000 91,288,000 14,239,000 -46,296,000 -14,335,000 -15,624,000 1,897,000 8,591,000 -11,377,000 1,108,000 -514,000 -19,606,000 -2,728,000 44,000 6,770,000 6,330,000 18,710,000 -12,550,000 8,195,000 -23,540,000 -7,924,000 -16,261,000 3,414,000 -2,022,000 -9,140,000 6,110,000 -1,484,000 26,379,000 4,761,000 17,280,000 -5,907,000 -17,410,000 -12,802,000 -5,090,000 944,000 -3,501,000 -18,433,000 560,000 -11,204,000 -1,351,000 -16,529,000  -1,758,000 1,706,000 5,128,000  1,669,000 
          prepaid and other current assets
        1,100,000 100,000 200,000 -500,000 4,000,000 -8,600,000 -400,000 9,800,000 200,000 -1,900,000 -2,900,000 5,900,000 1,800,000 4,500,000 5,300,000 -4,200,000 -8,600,000 -500,000 -1,200,000 -3,100,000 1,600,000 100,000 -1,200,000 100,000 -1,100,000 1,700,000 -500,000 2,600,000 -2,700,000 2,700,000 -1,700,000 800,000 6,688,000 -2,726,000 -892,000 4,726,000 9,297,000 -3,500,000 -1,774,000 14,290,000 -3,579,000 -384,000 -2,141,000 5,960,000 357,000 -3,781,000 9,774,000 -2,958,000 10,210,000 1,100,000 80,000 -6,072,000 13,200,000 -4,377,000 1,489,000 -5,366,000 4,614,000 3,586,000 910,000 -29,901,000 -3,144,000 -3,867,000 16,731,000 3,692,000 -24,437,000 -8,607,000 3,704,000 74,187,000  20,432,000 -23,531,000 2,710,000  662,000 -1,433,000 -1,217,000 4,653,000 -1,105,000         
          accounts payable, trade
        24,700,000 -33,400,000 16,800,000 -2,800,000 20,800,000 -90,700,000 53,500,000 20,400,000 -33,800,000 25,700,000 27,800,000 -55,500,000 -17,400,000 -6,200,000 -57,100,000 15,900,000 31,600,000 -1,900,000 37,000,000 14,600,000 -4,900,000 32,600,000 -2,000,000 1,300,000 -11,300,000 -13,900,000 11,800,000 -12,900,000 -10,200,000 7,100,000 -4,600,000 22,600,000 5,400,000 175,000 5,518,000 3,430,000 -4,377,000 7,299,000 -4,009,000 4,964,000 -5,983,000 -17,098,000 -9,398,000 -15,579,000 -18,508,000 20,682,000 -472,000 -4,588,000 -3,825,000 -1,323,000 -4,149,000 28,432,000 2,264,000 -3,291,000 7,108,000 -4,489,000 -11,442,000 1,879,000 -1,581,000 3,528,000 -4,730,000 12,980,000 5,419,000 -4,502,000 -2,223,000 -6,336,000 13,508,000 -12,567,000 -12,201,000       -17,088,000 24,429,000          9,024,000 
          due to affiliates
        -19,800,000 -6,300,000 4,900,000 -24,000,000 12,200,000 19,500,000 -2,200,000 -24,800,000 33,600,000 35,900,000 8,100,000 -2,700,000 10,400,000 -9,500,000 -5,200,000 -27,600,000 -1,200,000 -4,800,000 33,300,000 2,800,000 7,000,000 7,500,000 1,100,000 -27,800,000 -3,200,000 32,900,000 -13,200,000 10,100,000 -7,200,000 -6,300,000 14,300,000 -12,100,000 -6,000,000 3,310,000 -2,081,000 308,000 3,296,000 2,584,000 3,068,000 6,932,000 -5,372,000 -23,611,000 -30,011,000 13,633,000 27,773,000 -8,278,000 12,562,000 -22,024,000 20,798,000 -18,157,000 4,395,000 17,135,000 10,472,000 -2,928,000 -390,000 1,511,000 -360,000 -3,001,000 5,358,000 -3,112,000 -2,722,000 7,805,000 4,259,000 -5,980,000 6,601,000 6,191,000 -6,717,000 -3,398,000 -8,037,000 -937,826,000 -223,248,000 -16,816,000 24,542,000 1,170,000 -3,456,000 10,093,000 5,381,000 6,572,000 956,000 13,379,000 -11,206,000  12,028,000 -402,000 -9,146,000  7,989,000 
          accrued and other current liabilities
        -11,000,000 11,000,000 4,500,000 10,000,000 -13,900,000 2,700,000 -3,400,000 7,900,000 -8,400,000  -5,000,000 11,700,000 -8,700,000 -3,700,000 -4,100,000 15,000,000 1,600,000 1,500,000 4,800,000 -5,100,000 3,800,000 -7,900,000 6,600,000 5,700,000 -5,600,000 -5,700,000 10,000,000 2,200,000 -3,800,000 -12,800,000 -500,000 -4,000,000 6,200,000 5,226,000 13,699,000 458,000 -4,905,000 -8,669,000 5,254,000 -1,738,000 1,253,000 -23,122,000 -9,706,000 -1,586,000 2,874,000 25,637,000 4,634,000 -5,580,000 -6,620,000 3,625,000 4,036,000 -9,365,000 7,538,000 -14,489,000 6,993,000 -5,253,000 7,003,000 -16,646,000 9,496,000 4,170,000 3,405,000 -4,576,000 5,007,000 -3,612,000 1,423,000 -8,390,000 51,000 2,778,000 -9,887,000 -41,205,000 -22,979,000 13,430,000 -18,974,000 35,377,000 -35,434,000 -12,244,000 -4,611,000 25,346,000 62,862,000 -52,918,000 -16,325,000  -13,665,000 4,003,000 -7,951,000  -1,458,000 
          other - net
        -7,700,000 -6,400,000 -7,600,000 1,000,000 -200,000 1,700,000 -1,300,000 2,500,000 1,000,000 1,800,000 600,000 -2,200,000 2,600,000    -4,300,000 800,000 5,300,000 -3,600,000 -700,000 -2,900,000 2,000,000 2,200,000 1,100,000 -1,500,000 -600,000 1,700,000 -600,000 7,600,000 -5,000,000 4,100,000 -3,800,000 -5,620,000 6,208,000 7,579,000 -3,585,000 1,102,000 1,456,000 2,190,000 -1,648,000                                    6,692,000  -3,474,000         
          net cash from operating activities
        68,400,000 102,800,000 2,000,000 7,900,000 72,300,000 -41,400,000 20,100,000 11,500,000 -14,800,000 66,000,000 41,500,000 -1,700,000 -200,000 -31,300,000 -11,400,000 31,200,000 37,400,000 -52,600,000 75,800,000 -38,100,000 -49,800,000 9,600,000 -38,300,000 37,000,000 34,600,000 22,100,000 21,200,000 -4,100,000 -21,500,000 -10,100,000 -28,600,000 2,600,000 -33,000,000 1,092,000 47,574,000 14,437,000 -11,344,000 22,591,000 -8,021,000 8,700,000 14,903,000 -643,000 -77,807,000 -5,951,000 116,267,000 98,697,000 89,086,000 19,369,000 -10,741,000 -22,740,000 19,482,000 575,000 22,401,000 16,054,000 22,700,000 -6,513,000 4,898,000 -14,030,000 27,229,000 -12,505,000 -3,630,000 31,178,000 28,200,000 50,474,000 21,658,000 10,688,000 -17,961,000 -28,064,000 74,736,000 -896,197,000 -134,054,000 305,963,000 58,850,000 34,985,000 -61,827,000 -77,031,000 98,118,000 67,843,000 50,220,000 51,251,000 16,039,000  68,500,000 31,659,000 27,065,000  20,253,000 
          cash flows from investing activities:
                                                                                               
          purchase of property, plant and equipment
        -74,800,000  -20,100,000 -23,800,000 -21,200,000 -13,200,000 -22,500,000 -16,900,000 -29,700,000 -32,300,000 -26,100,000 -22,300,000 -14,300,000 -16,100,000 -18,400,000 -25,800,000 -26,000,000 -37,300,000 -19,800,000 -18,500,000 -7,400,000 -1,900,000 -1,900,000 -3,600,000 -6,000,000 -19,700,000 -16,600,000 -12,700,000 -10,600,000 -33,700,000 -36,300,000 -9,500,000 -3,500,000 -8,249,000 -4,747,000 -9,798,000 -9,045,000 -8,817,000 -5,393,000 -3,899,000 -3,835,000 -16,625,000 -11,488,000 -15,627,000 -10,960,000 -14,694,000 -10,107,000 -7,058,000 -9,700,000 -14,539,000 -15,429,000 -7,201,000 -9,364,000 -7,278,000 -4,234,000 -3,266,000 -2,899,000 -9,232,000 -3,515,000 -4,225,000 -3,128,000  -2,366,000 -2,040,000 -972,000  -2,740,000 -2,743,000 -9,184,000  -11,777,000 -6,046,000 -8,915,000  -6,015,000 -5,240,000 -2,438,000           
          proceeds from the sale of hawesville
        200,000,000                                                                                       
          insurance proceeds received for property damage
        5,000,000                                                                                       
          net cash from investing activities
        130,200,000 -50,500,000 -16,100,000 -18,100,000 -15,500,000 -500,000 -22,500,000 -14,600,000 -29,700,000 -40,200,000 -400,000 -2,900,000 -14,300,000 -15,400,000 -18,400,000 -25,700,000 -26,000,000 -36,900,000 -19,800,000 -18,500,000 -7,400,000 -400,000 -1,900,000 -3,600,000 -5,900,000 -9,400,000 -16,600,000 -2,200,000 -10,600,000 -33,600,000 -36,300,000 -9,500,000 -3,500,000 -8,217,000 -4,075,000 -9,856,000 4,793,000 -7,781,000 -3,770,000 -5,777,000 -3,835,000 -6,940,000 33,375,000 -36,159,000 -33,639,000 -69,119,000 -14,480,000 -10,606,000 -14,852,000 -23,248,000 -22,869,000 -60,151,000 -10,906,000 -5,453,000 -5,837,000 -19,520,000 -1,721,000 -11,879,000 -4,480,000 -1,357,000 -7,179,000 7,875,000 -19,221,000 -7,972,000 -6,153,000 -5,398,000 -15,733,000 -9,397,000 -15,685,000 -32,960,000 -49,648,000 -60,819,000 -16,304,000 -19,605,000 -25,449,000 -34,504,000 -29,013,000 -41,595,000 -49,781,000 -45,159,000 -75,402,000  -91,093,000 -74,957,000 -51,469,000  -20,602,000 
          cash flows from financing activities:
                                                                                               
          borrowings under revolving credit facilities
        160,600,000 170,400,000 126,100,000 329,100,000 257,600,000 326,000,000 111,500,000 142,000,000 155,900,000 81,700,000 167,400,000 215,400,000 192,400,000 216,000,000 313,800,000 332,300,000 264,100,000 334,600,000 217,300,000 229,300,000 197,600,000 85,300,000 51,200,000 600,000 121,800,000 73,500,000 26,400,000 118,600,000 169,600,000 105,800,000   300,000 259,000 302,000 487,000 233,000 279,000 305,000 224,000 371,000 323,000 404,000 555,000 455,000 692,000 5,085,000 67,776,000 18,870,000                                       
          repayments under revolving credit facilities
        -155,700,000 -125,900,000 -129,200,000 -320,900,000 -300,100,000 -281,500,000 -102,000,000 -191,100,000 -130,500,000 -126,200,000 -235,400,000 -187,200,000 -209,400,000 -204,400,000 -250,400,000 -352,600,000 -307,400,000 -268,400,000 -209,500,000 -240,100,000 -192,200,000 -90,300,000 -91,200,000 -600,000 -35,800,000 -69,800,000 -34,200,000 -145,700,000 -157,600,000    -300,000 -259,000 -302,000 -487,000 -233,000 -279,000 -305,000 -224,000 -371,000 -323,000 -404,000 -555,000 -455,000 -692,000 -5,085,000 -67,776,000 -24,870,000                                       
          repayments of industrial revenue bonds
        -7,800,000                                                                                       
          repayments under grundartangi casthouse debt facility
         -116,400,000 -2,300,000 -2,200,000 -2,300,000                                                                                   
          payment of incentive compensation withholding taxes
        -4,700,000                                                                                       
          contributions from joint venture partner
        7,000,000                                                                                       
          net cash from financing activities
        -600,000 -69,500,000 123,400,000 6,000,000 -44,800,000   -49,100,000 49,200,000 -30,200,000 -7,900,000 34,500,000 -9,400,000 36,200,000 63,300,000 -21,200,000 -3,900,000 61,300,000 2,700,000 39,300,000 400,000 -10,000,000 -52,500,000 -5,000,000 81,000,000 3,700,000 -7,800,000 9,800,000 15,400,000 9,200,000 14,300,000 100,000 100,000 123,000 41,000 197,000 43,000     -16,913,000 -19,439,000 254,000 -2,580,000 123,000 -5,997,000 -10,725,000 16,657,000   -4,033,000 -7,085,000 -38,755,000     -3,393,000 79,041,000 929,502,000 -38,887,000 950,000 2,042,000 -19,194,000 -35,675,000 131,138,000 2,654,000 20,023,000 20,480,000 5,571,000 59,123,000  43,266,000 25,709,000 32,999,000  1,654,000 
          change in cash, cash equivalents and restricted cash
        198,000,000  109,300,000 -4,200,000 12,000,000  -7,400,000 -52,200,000 4,700,000  33,200,000 29,900,000 -23,900,000  33,500,000 -15,700,000 7,500,000  58,700,000 -17,300,000 -56,800,000  -92,700,000 28,400,000 109,700,000  -3,200,000 3,500,000 -16,700,000  -50,600,000 -6,800,000 -36,400,000                                                       
          cash, cash equivalents and restricted cash, beginning of period
        135,600,000  35,700,000  90,300,000  55,500,000  40,700,000  84,300,000  39,700,000  39,700,000  168,000,000                                                       
          cash, cash equivalents and restricted cash, end of period
        333,600,000  109,300,000 -4,200,000 47,700,000  -7,400,000 -52,200,000 95,000,000  33,200,000 29,900,000 31,600,000  33,500,000 -15,700,000 48,200,000  58,700,000 -17,300,000 27,500,000  -92,700,000 28,400,000 149,400,000  -3,200,000 3,500,000 23,000,000  -50,600,000 -6,800,000 131,600,000                                                       
          loss on early extinguishment of debt
         1,500,000                                                                                 
          gain on sale of assets
                                                                                             
          bargain purchase gain
             -245,900,000                                                                               
          force majeure settlement
                                                                                               
          lower of cost or nrv inventory adjustment
                    5,100,000 -6,900,000 -6,300,000       4,200,000 3,700,000 23,700,000 13,400,000 3,000,000 2,400,000   30,600,000 9,100,000 -3,200,000 3,029,000                                                     
          change in operating assets and liabilities, net of acquisition:
                                                                                               
          accounts receivable - net
            -12,500,000 -2,400,000 21,500,000 -36,000,000 -1,400,000 15,500,000 -4,600,000 6,900,000 19,100,000    -47,100,000 11,400,000 -11,600,000 -9,600,000 -6,400,000 -400,000 -14,600,000 16,900,000 17,200,000 1,700,000 10,000,000 9,100,000 -8,400,000 8,900,000 5,200,000 -13,200,000 -40,300,000 -2,704,000 2,105,000 -6,247,000 -23,793,000 -1,245,000 3,117,000 -1,636,000 -3,193,000                                    447,000  35,803,000         
          ravenswood retiree medical settlement
                                                                                              
          pbgc settlement
                                                                                              
          capital expenditures
        -74,800,000 -20,100,000 -23,800,000 -21,200,000 -13,200,000 -2,900,000 -800,000 6,700,000 -32,300,000 -26,100,000 -22,300,000 3,900,000 2,600,000 -18,400,000 -25,800,000 4,200,000 1,000,000 -19,800,000 -18,500,000 1,800,000 -1,900,000 -1,900,000 -600,000 1,200,000 -19,700,000 1,800,000 -1,900,000 4,000,000 1,500,000 -36,300,000 -9,500,000 -3,500,000 -8,249,000 -4,747,000 -9,798,000 -9,045,000 -8,817,000 -5,393,000 -3,899,000 -3,835,000 -16,625,000 -11,488,000 -15,627,000 -10,960,000 -14,694,000 -10,107,000 -7,058,000 -9,700,000 -14,539,000 -15,429,000 -7,201,000 -9,364,000 -7,278,000 -4,234,000 -3,266,000 -2,899,000 -9,232,000 -3,515,000 -4,225,000 -3,128,000 -2,366,000 -2,040,000 -972,000 -2,740,000 -2,743,000 -9,184,000 -11,777,000 -6,046,000 -8,915,000 -6,015,000 -5,240,000 -2,438,000   
          free cash flows
        -6,400,000 102,800,000 -18,100,000 -15,900,000 51,100,000 -54,600,000 17,200,000 10,700,000 -8,100,000 33,700,000 15,400,000 -24,000,000 3,700,000 -28,700,000 -29,800,000 5,400,000 41,600,000 -51,600,000 56,000,000 -56,600,000 -48,000,000 7,700,000 -40,200,000 36,400,000 35,800,000 2,400,000 23,000,000 -6,000,000 -17,500,000 -8,600,000 -64,900,000 -6,900,000 -36,500,000 -7,157,000 42,827,000 4,639,000 -20,389,000 13,774,000 -13,414,000 4,801,000 11,068,000 -17,268,000 -89,295,000 -21,578,000 105,307,000 84,003,000 78,979,000 12,311,000 -20,441,000 -37,279,000 4,053,000 -6,626,000 13,037,000 8,776,000 18,466,000 -9,779,000 1,999,000 -23,262,000 23,714,000 -16,730,000 -6,758,000 31,178,000 25,834,000 48,434,000 20,686,000 10,688,000 -20,701,000 -30,807,000 65,552,000 -896,197,000 -145,831,000 299,917,000 49,935,000 34,985,000 -67,842,000 -82,271,000 95,680,000 67,843,000 50,220,000 51,251,000 16,039,000  68,500,000 31,659,000 27,065,000  20,253,000 
          proceeds from sale of property, plant and equipment
                                                     10,000           15,000         42,000       12,000    42,000 59,000   
          acquisition of subsidiary net of cash acquired
                 -7,900,000                                                                             
          repayment of senior notes due 2028
                                                                                              
          early redemption premiums paid
                                                                                              
          proceeds from issuance of senior notes due 2032
                                                                                              
          payment of deferred financing fees
                                                                                              
          repayments under iceland term facility
             -1,200,000                                                                               
          borrowings under grundartangi casthouse debt facility
             25,000,000 15,000,000 20,000,000 10,000,000 10,000,000 10,000,000 40,000,000                                                                       
          borrowings under vlissingen facility agreement
                                                                                              
          repayments under vlissingen facility agreement
                                                                                               
          payments related to tax withholding for share-based compensation
                                                                                               
          carbon credit proceeds
                3,000,000                                                                              
          carbon credit repayments
                                                                                             
          change in cash, cash equivalents, and restricted cash
                                                                                               
          cash, cash equivalents and restricted cash, beginning of year
                                                                                               
          cash, cash equivalents and restricted cash, end of year
                                                                                               
          non-trade payables
                                                                                               
          proceeds for joint venture partner's share of co-tenancy assets
          4,000,000                                                                                     
          proceeds from sale of assets
                                                                                              
          repayments under vlissingen credit facility
                                                                                               
          proceeds from co-tenancy assets at jamalco jv
            5,700,000                                                                                   
          asset impairment
                                                                                             
          other postretirement benefits gain
                                                                                               
          ravenswood retiree legal settlement
                                                                                              
          debt issuance cost
                                                                                               
          repayments on casthouse facility
                                                                                               
          borrowings under iceland term facility
                                                                                               
          change in deferred tax expense
                                                                                               
          proceeds from sales of property, plant and equipment
                                                                                               
          acquisition of subsidiary, net of cash acquired
                                                                                               
          borrowings under vlissingen credit facility
                                                                                               
          century aluminum company
                                                                                               
          consolidated statements of cash flows
                                                                                               
          net cash (used) provided by financing activities
                                                                                               
          supplemental cash flow information:
                                                                                               
          cash paid for:
                                                                                               
          interest
              5,500,000 13,700,000 2,900,000    4,000,000 13,000,000   1,200,000 10,800,000 300,000 9,600,000 16,100,000   10,200,000 800,000  1,000,000 10,200,000 400,000 9,800,000                                                         
          taxes, net of refunds
              1,700,000 2,700,000 1,100,000    -400,000                                                                           
          non-cash investing activities:
                                                                                               
          capitalized interest
              1,000,000 2,400,000    1,000,000 800,000   1,000,000 800,000                                                                      
          distribution of property, plant and equipment to nci
              7,800,000                                                                                 
          change in deferred tax benefit
               200,000 400,000         10,300,000 6,700,000                                                                     
          net loss
                                        -300,000   7,131,000 -15,139,000              -4,318,000               -24,354,000 40,142,000 -107,146,000 -114,624,000                   
          adjustments to reconcile net loss to net cash from operating activities:
                                                                                               
          repayment of senior notes due 2025
                                                                                             
          early redemption and tender premiums paid
                                                                                             
          proceeds from issuance of senior notes due 2028
                                                                                             
          proceeds from issuance of convertible senior notes
                                                                                             
          repayments under hawesville term loan
                                                                                               
          purchase of capped calls related to convertible senior notes
                                                                                               
          deferred tax provision
                  -10,900,000 -11,100,000 -1,500,000  10,400,000 40,600,000 1,300,000                                                                       
          debt issuance costs
                      -100,000 -900,000 -600,000  -100,000                               -68,000                                     
          repayment of iceland term facility
                  -3,700,000 -3,700,000 -2,400,000                                                                           
          depreciation and amortization
                   15,600,000 15,900,000 15,900,000 15,400,000 22,700,000 19,400,000 20,200,000 20,600,000 20,900,000 20,900,000 21,300,000 21,300,000 20,200,000 20,200,000 20,200,000 19,900,000 18,800,000 24,300,000 22,600,000 23,900,000 22,100,000 21,500,000 21,158,000 20,869,000 21,284,000 20,938,000 21,474,000 20,802,000 21,244,000 21,260,000              15,637,000 15,636,000 15,652,000 15,615,000 15,515,000 15,134,000 15,930,000 16,237,000 15,808,000 15,727,000 15,778,000 15,738,000 16,823,000 19,218,000 20,845,000 21,356,000 21,052,000 21,075,000 20,785,000 20,325,000 19,723,000 19,107,000 18,905,000 19,130,000 17,866,000 17,327,000 14,897,000  14,256,000 14,256,000 13,794,000  13,158,000 
          loss on derivative instruments
                     100,800,000                                                                          
          opeb curtailment gain
                     -900,000                                                                          
          ravenswood pbgc settlement
                                                                                               
          repayment of senior notes due 2021
                                                                                               
          proceeds from issuance of senior notes due 2025
                                                                                               
          debt retirement cost
                                                                                               
          other non-cash items -- net
                      -3,500,000                                                                         
          accounts receivable -- net
                      50,100,000                                                                         
          other -- net
                      -7,100,000                                                                         
          proceeds from sales of property, plant & equipment
                             100,000                                                               
          repayments on hawesville term loan
                          -5,000,000 -5,000,000 -5,000,000                                                                   
          purchases of capped calls related to convertible senior notes
                                                                                              
          taxes
                        500,000          200,000 100,000 8,500,000 1,000,000                                                         
          unrealized losses on forward and derivative contracts
                                                                                               
          net loss on sale of bhh
                                                                                               
          proceeds from sale of joint venture
                                 10,300,000                                                             
          borrowings under hawesville term loan
                                                                                               
          other short-term borrowings
                                                                                             
          repayments on other short-term borrowings
                                                                                               
          issuance of common stock
                                   200,000 100,000 100,000 123,000 41,000 197,000 43,000         254,000 23,000 123,000 3,000                        1,543,000    1,973,000 20,000 472,000 581,000 2,380,000 85,000 337,000 37,000 949,000 811,000 5,077,000 
          debt retirement costs
                                                                                            
          helguvik losses
                                                                                               
          repayment of debt
                                                                                -146,000 -145,000 -143,000   -14,365,000 -68,658,000   
          proceeds from issuance of debt
                                                                                            
          repayment on other short-term borrowings
                                                                                             
          borrowing under hawesville term loan
                                                                                               
          loss on sale of bhh
                                                                                              
          borrowing under term loan
                                                                                               
          repayments on term loan
                               -5,000,000 -5,000,000                                                               
          unrealized (gains) on forward and derivative contracts
                                                                                               
          ravenswood losses
                                                                                              
          borrowings under term loan
                                                                                             
          helguvik
                                                                                               
          other short term borrowings
                                    3,400,000                                                           
          unrealized loss on forward and derivative contracts
                                      -700,000 -800,000 -400,000  -939,000 -6,121,000 13,978,000                                                   
          ravenswood
                                                                                               
          proceeds from sale of ravenswood
                                           13,585,000                                                   
          capital expenditures in accounts payable
                                                                                               
          cash paid for interest
                                        200,000                                                       
          cash paid for taxes
                                        500,000                                                       
          unrealized gain on fair value of contingent consideration
                                                 -1,523,000 -10,287,000 -6,527,000                                           
          unrealized gain on contingent obligation
                                         -352,000                                                      
          bhh impairment
                                                                                               
          pension and other postretirement benefits
                                         -4,064,000 768,000 -52,000 1,576,000 1,181,000 337,000 713,000 632,000 -4,693,000 -36,000 722,000 -984,000 5,507,000 -936,000 -245,000 2,613,000 4,414,000 942,000 -5,059,000 1,443,000 2,456,000 933,000 878,000 -1,138,000 2,011,000 -2,160,000 -17,544,000 -11,064,000 2,660,000 3,700,000                      3,214,000  1,877,000 
          deferred income taxes
                                         -5,334,000 1,481,000 -662,000 -95,000 7,627,000 -2,007,000 -2,926,000 -3,587,000 -1,393,000 -3,769,000 -3,867,000 8,851,000 -3,869,000 3,771,000               5,603,000 732,000 4,898,000 4,319,000 18,740,000 1,182,000 -518,000 25,548,000 527,878,000 -3,783,000 -50,887,000 -143,682,000 -92,997,000 10,127,000 -57,036,000 8,087,000 -100,118,000 3,582,000 54,550,000 -84,356,000  -14,064,000 19,595,000 6,479,000  -8,891,000 
          stock-based compensation
                                         396,000   477,000 368,000 538,000 275,000 321,000 463,000 487,000 489,000 405,000 377,000 424,000 335,000 198,000 117,000 462,000 282,000 217,000 201,000 200,000 67,000 145,000 186,000 169,000 2,013,000 488,000 -1,187,000 929,000 879,000 1,284,000 1,270,000 799,000 1,359,000 -90,000 -281,000 376,000 3,188,000 8,470,000 2,197,000 1,167,000 1,077,000 1,521,000 979,000 731,000 1,313,000 2,559,000       
          pension contribution - mt. holly
                                                                                              
          purchase of remaining interest in mt. holly smelter
                                                 49,475,000                                             
          restricted and other cash deposits
                                           -58,000 253,000 -4,000 1,623,000   151,000 141,000 20,730,000 -21,012,000 416,000 1,814,000 -1,999,000 665,000 1,576,000 -2,295,000         18,851,000 -12,662,000 -490,000 -493,000 -510,000    9,718,000 -7,812,000   -6,000 1,145,000 -1,000 2,600,000 1,415,000          
          repurchase of common stock
                                                 -16,913,000 -19,439,000         -4,033,000 -7,085,000                              
          change in cash and cash equivalents
                                         -7,002,000 43,540,000 4,778,000 -6,508,000 14,810,000 -11,791,000 2,923,000 11,068,000 -7,583,000 -44,432,000 -59,023,000 63,189,000 29,832,000 72,026,000 8,886,000 -31,590,000 -56,713,000 13,270,000 -67,940,000 11,495,000 10,601,000 16,863,000 -26,033,000 -856,000 -32,994,000 -16,006,000 -61,086,000 -10,809,000 39,053,000 8,979,000 42,525,000 15,505,000                       
          cash and cash equivalents, beginning of year
                                                                                               
          cash and cash equivalents, end of year
                                                                                               
          equity in earnings of joint ventures, net of dividends
                                          -214,000 248,000 -393,000     1,263,000 -704,000   1,086,000 -285,000                                         
          cash and cash equivalents, beginning of period
                                          132,403,000  115,393,000  163,242,000  84,088,000                                  44,168,000   
          cash and cash equivalents, end of period
                                          43,540,000 4,778,000 125,895,000  -11,791,000 2,923,000 126,461,000  -44,432,000 -59,023,000 226,431,000  72,026,000 8,886,000 52,498,000                                  20,673,000 -17,589,000 52,763,000   
          unrealized gain on e.on contingent obligation
                                           -353,000 -353,000 -352,000 -353,000 -353,000 -353,000 -352,000 -353,000 -353,000 -353,000 -353,000 -353,000 -353,000 -353,000 -353,000 -353,000 -353,000 -15,722,000                                   
          lower of cost or market inventory adjustment
                                            -3,880,000 -2,159,000 2,370,000 4,913,000 -5,784,000 -23,474,000 5,324,000   -140,000 -1,107,000 -9,039,000 -5,763,000 10,211,000 5,838,000 -8,201,000 5,434,000 -17,051,000 6,303,000 13,479,000 123,000 -139,000 -125,000 -7,300,000 7,056,000 -57,000 -6,658,000 -2,307,000 -40,458,000 2,271,000                   
          gain on remeasurement of equity investment
                                                                                               
          helguvik impairment
                                                                                               
          ravenswood impairment
                                                                                            
          sebree power contract amortization
                                                     -5,534,000 -16,570,000                                      
          purchase of sebree smelter
                                                                                            
          equity in earnings of joint ventures
                                              -155,000 -379,000 -357,000                                               
          gain on bargain purchase
                                                         -3,211,000                                     
          depreciation
                                                 24,302,000 19,406,000 18,278,000 18,131,000 17,947,000 17,641,000 17,375,000 17,768,000 17,488,000   15,688,000                                   
          accounts receivable — net
                                                 -863,000 2,696,000 -6,343,000 72,702,000 -25,589,000 1,677,000 -6,635,000 10,566,000 -4,938,000 32,820,000 -31,885,000 -1,998,000 -5,857,000 27,609,000 -21,405,000 -2,884,000                               
          other — net
                                                 2,480,000 3,321,000 -8,328,000 -604,000 6,103,000 -917,000 -2,560,000 64,000 15,246,000 -11,538,000 11,335,000 2,558,000 13,780,000 -12,880,000 369,000 335,000                               
          investments in and advances to joint ventures
                                                             -75,000 -100,000 -100,000 -100,000    -15,000 -7,000 -10,000 -6,000 -15,000   -1,000                  
          accrued and other plant curtailment costs — net
                                                  1,072,000 1,077,000 1,083,000 1,086,000 1,089,000 1,092,000 1,072,000 1,112,000 1,114,000 1,154,000 1,226,000 1,244,000 1,407,000 1,374,000                               
          debt discount amortization
                                                  98,000 96,000 95,000 93,000 91,000 89,000 88,000 86,000 84,000 223,000 279,000 278,000 268,000 267,000 256,000 256,000 246,000 534,000 821,000 811,000 791,000 782,000 766,000                       
          nordural expansion — helguvik
                                                  -55,000 -102,000 -73,000 -60,000 -91,000 -93,000 -93,000 -476,000 -296,000 -814,000 -1,745,000 -1,843,000                                  
          purchase of carbon anode assets and improvements
                                                  -4,698,000 -3,012,000 -1,594,000 -950,000 -5,054,000 -1,502,000 -5,724,000 -9,694,000 -4,849,000 -3,520,000 -150,000                                   
          equity in losses of joint ventures, net of dividends
                                                    -510,000    495,000                                       
          unrealized net loss on forward contracts
                                                         -408,000 -365,000 -256,000 -141,000 -209,000 19,000 -1,778,000 4,955,000 -2,393,000 -4,527,000   5,574,000   1,853,000 10,276,000 -834,000 697,000 1,817,000 -2,716,000 68,455,000 140,720,000 395,930,000 209,024,000 51,839,000 177,559,000 -27,399,000 270,315,000 -220,807,000 -2,565,000 286,138,000  53,363,000 -25,698,000 22,269,000  -1,947,000 
          gain on fair value of contingent consideration
                                                                                               
          payments received from joint ventures
                                                                                               
          unrealized net gain on forward contracts
                                                                                               
          repayment of contingent obligation
                                                                                             
          borrowings under revolving credit facility
                                                         6,000,000    18,076,000                              
          repayments under revolving credit facility
                                                             -18,076,000         -25,000,000                   
          undistributed earnings of joint ventures
                                                          -731,000 -436,000 -951,000 -507,000 -1,126,000 -349,000 -641,000 -859,000 -907,000 -460,000 -1,219,000 -793,000 -1,183,000   -867,000 -570,000   -4,440,000 -2,507,000 -5,566,000 -4,393,000 -4,294,000 -3,737,000             
          dividends and payments received on advances from joint ventures
                                                                                               
          issuance of common stock — net
                                                                                              
          cash and cash equivalents, beginning of the period
                                                          183,976,000  183,401,000  304,296,000  198,234,000            96,365,000           
          cash and cash equivalents, end of the period
                                                          13,270,000 -67,940,000 195,471,000  16,863,000 -26,033,000 182,545,000  -16,006,000 -61,086,000 293,487,000  8,979,000 42,525,000 213,739,000            168,124,000           
          proceeds from the sale of property, plant and equipment
                                                            353,000 99,000 21,000 10,000 58,000  1,415,000                             
          realized benefit of contractual receivable
                                                                                               
          non-cash loss on early extinguishment and modification of debt
                                                                                               
          non-cash contingent obligation
                                                                                               
          net change in restricted cash
                                                                                               
          non-cash loss on early extinguishment of debt
                                                                                           
          purchase of carbon anode assets
                                                              339,000                                 
          payments received on advances from joint ventures
                                                              3,166,000                               
          nordural expansion
                                                               -1,640,000 -1,946,000 -2,547,000 -2,367,000 -3,917,000 -4,051,000 -4,128,000 -4,986,000 -5,435,000 -4,678,000 -4,375,000 -5,474,000 -5,631,000 -6,501,000 -26,917,000 -20,749,000 -25,259,000 -7,389,000 -9,204,000 -20,579,000 -29,806,000 -29,175,000 -37,755,000 -46,754,000 -40,233,000 -68,769,000 -79,445,000 -86,987,000 -64,666,000 -48,988,000 -42,302,000  
          repayments of debt
                                                                                               
          issuance of common stock – net
                                                                  51,000                           
          unrealized gain on contractual receivable
                                                                        -88,000                       
          write-off of intangible asset
                                                                                              
          non-cash loss from disposition of equity investments
                                                                                               
          sale of short-term trading securities
                                                                         13,686,000 24,599,000 2,652,000 218,314,000 127,450,000               
          payment received on advances from joint ventures
                                                                                               
          financing fees
                                                                                         -515,000 -4,617,000 -257,000  
          accrued and other plant curtailment costs – net
                                                                  1,569,000 -6,968,000 -9,624,000  -729,000 -304,000 -2,272,000                       
          loss on disposal of assets
                                                                                    180,000      -16,000 27,000 -31,000  24,000 
          changes in operating assets and liabilities:
                                                                                               
          accounts receivable – net
                                                                  2,771,000 -18,455,000 7,520,000  -2,286,000 -1,301,000 2,314,000  -10,052,000 -92,000 26,342,000  -21,361,000 5,314,000 -6,356,000  11,026,000      -15,640,000    -8,202,000  -2,078,000 
          other – net
                                                                  -13,480,000 2,459,000 -2,998,000  -2,695,000 1,320,000 -6,093,000  510,000 4,936,000 -20,000  -2,909,000 -632,000 -1,460,000  3,466,000      -2,838,000    -5,148,000  6,115,000 
          payments received on advances to joint ventures
                                                                                              
          realized benefit on contractual receivable
                                                                      15,130,000 16,825,000 15,368,000                       
          unrealized net income on forward contracts
                                                                    4,715,000                           
          unrealized net gain on contractual receivable
                                                                                               
          1.
                                                                                               
          goodwill impairment
                                                                                               
          non-cash loss on early extinguish and modification of debt
                                                                                               
          purchase of short-term trading securities
                                                                             -9,000,000 11,004,000 -108,536,000               
          purchase of property, plant, and equipment
                                                                                               
          repayment of long-term debt – related party
                                                                             -25,000,000                  
          repayment under revolving credit facility
                                                                                               
          excess tax benefits from share-based compensation
                                                                             -158,000 -499,000 -72,000 -29,000 -157,000 -330,000 -150,000 -154,000         
          issuance of preferred stock
                                                                                               
          non-cash gain on early extinguishment of debt
                                                                                               
          pension and other post retirement benefits
                                                                        3,666,000 2,231,000 3,226,000 3,383,000 4,112,000   4,336,000 4,177,000 6,189,000 -3,408,000 4,764,000 5,143,000 3,556,000 3,866,000 3,636,000 3,503,000  3,832,000     
          undistributed losses of joint ventures
                                                                        -1,105,000    887,000                   
          borrowings of long-term debt
                                                                                 30,000,000           
          repayment of long-term debt
                                                                                  -34,636,000 -285,151,000 -29,649,000           
          change in cash
                                                                                               
          cash, beginning of year
                                                                                               
          cash, end of year
                                                                                               
          accrued plant curtailment costs
                                                                          -8,095,000 2,816,000 18,235,000                   
          equity investment impairment
                                                                                              
          repayments of long-term debt – related party
                                                                                               
          excess tax benefits from shared-based compensation
                                                                              158,000 499,000  29,000 157,000 330,000  154,000 235,000 855,000       
          net change in cash
                                                                          -33,694,000 -37,461,000 138,092,000  -222,589,000 246,094,000 44,588,000  -122,951,000             
          cash, beginning of the period
                                                                          129,400,000  60,962,000              
          cash, end of the period
                                                                          -33,694,000 -37,461,000 267,492,000  -222,589,000 246,094,000 105,550,000  -122,951,000             
          issuance of common stock – net of issuance costs
                                                                            104,041,000  441,311,000    -1,068,000             
          lower of cost or market adjustment
                                                                                               
          workers’ compensation
                                                                                               
          loss (gain) on disposal of assets
                                                                                               
          prepaids and other current assets
                                                                                        -3,398,000  3,275,000 -4,317,000 -1,395,000  1,448,000 
          proceeds from sale of property, plant, and equipment
                                                                                               
          (gain) loss on disposal of assets
                                                                              139,000   118,000 46,000   -6,894,000 -2,000         
          accounts payable – trade
                                                                                12,797,000        4,724,000    -3,175,000   
          investments in joint ventures
                                                                                               
          business acquisitions, net of cash acquired
                                                                                             
          repayment of long-term debt – third party
                                                                                               
          net borrowings (repayments) under credit facility
                                                                                               
          dividends
                                                                                           
          increase in short-term investments – net
                                                                                  -137,046,000             
          net repayments under revolving credit facility
                                                                                              
          net change in cash and cash equivalents
                                                                                    71,759,000  20,919,000 11,663,000 -240,000       
          repayment of long-term debt - third party
                                                                                               
          repayment of long-term debt - related party
                                                                                               
          net borrowings (repayments) under revolving credit facility
                                                                                               
          accounts payable - trade
                                                                                      -74,000         
          purchase of other property, plant and equipment
                                                                                      -3,042,000 -4,936,000 -2,632,000  -4,148,000 -2,941,000 -2,540,000   
          borrowings
                                                                                      20,000,000 10,000,000 59,000,000  43,559,000 40,053,000 105,325,000 314,000  
          cash and cash equivalents at the beginning of the period
                                                                                              
          cash and cash equivalents at the end of the period
                                                                                      20,919,000 11,663,000 17,512,000       
          restricted cash deposits
                                                                                       -4,001,000     
          excess tax benefit from share-based compensation
                                                                                        -855,000       
          net borrowings under revolving credit facility
                                                                                        -2,969,000       
          cash and cash equivalents at the beginning of the year
                                                                                        17,752,000       
          adjustments to reconcile net income to net cash provided by operating activities:
                                                                                               
          repayment of long-term debt — third party
                                                                                               
          repayment of long-term debt — related party
                                                                                               
          net borrowing under revolving credit facility
                                                                                               
          increase in cash
                                                                                               
          repayment of third party debt
                                                                                               
          repayment of related party debt
                                                                                               
          net increase in cash and cash equivalents
                                                                                          20,673,000 -17,589,000 8,595,000   
          accounts payable — trade
                                                                                               
          inventory market adjustment
                                                                                              
          repayment of debt — third party
                                                                                               
          repayment of debt — related party
                                                                                               
          minority interest
                                                                                               
          cumulative effect of change in accounting principle
                                                                                               
          acquisitions, net of cash acquired
                                                                                              
          repayment of debt – third party
                                                                                               
          repayment of debt – related party
                                                                                               
          net increase in cash
                                                                                              1,305,000 
          cash, beginning of period
                                                                                              
          cash, end of period
                                                                                              1,305,000