7Baggers

Packaging Corporation of America
(NYSE:PKG) 

PKG stock logo

Packaging Corporation of America manufactures and sells containerboard and corrugated packaging products in the United States. The company operates through Packaging and Paper segments. The Packaging segment offers various containerboard and corrugated packaging products, such as conventional shippi...

Founded: 1959
Full Time Employees: 15,500
Sector: Consumer Cyclical
Industry: Packaging & Containers

Share this website to your friends
• Market Cap:
• Exchange:
• Shs Outstanding:
• Employees:
• Beta:
• Return on Equity (ROE) ttm:
• Return on Assets (ROA) ttm:
• EPS ttm:
• Book value per Share:
• Cash per Share:
• Current ast per Share:
• P/E ttm:
• P/E forward:
• P/E ttm high:
• P/E ttm low:
• P/S ttm:
• P/B ttm:
• P/FCF ttm:
• PEG ratio:
• Cash Ratio ttm:
• Quick Ratio ttm:
• Current Ratio ttm:
• Gross Mgn ttm:
• EBITDA Mgn ttm:
• Operating Mgn ttm:
• Net Income Mgn ttm:
• Trailing Div yield:
• Forward Div yield:
• Payout Ratio ttm:
• Ex-Dividend date:
• Target Price High:
• Target Price Low:
• Target Price Mean:
• Number of Analysts:
• Debt Ratio ttm:
• Debt to Equity ttm:
• Total Net Debt:
At a glance:
Bull Thesis:
Bear Thesis:
Main Competitors:
Moat:
Income 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 2017-02-28 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 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 2002-06-30 2002-03-31 2001-12-31 
                                                                                                      
      statements of income:
                                                                                                      
      net sales
    2,367,800,000 2,363,600,000 2,313,400,000 2,171,300,000 2,141,000,000 2,146,100,000 2,182,400,000 2,075,300,000 1,979,500,000 1,937,900,000 1,936,000,000 1,952,100,000 1,976,300,000 1,978,400,000 2,125,900,000 2,237,300,000 2,136,400,000 2,043,200,000 2,000,100,000 1,879,900,000 1,807,200,000 1,714,200,000 1,693,700,000 1,541,600,000 1,708,700,000 1,720,000,000 1,750,700,000 1,759,900,000 1,733,700,000 1,746,500,000 1,809,900,000 1,767,500,000 1,690,600,000 1,684,300,000 1,640,100,000 1,584,000,000 1,536,500,000 1,476,600,000 1,484,000,000 1,417,400,000 1,401,000,000 1,390,900,000 1,470,800,000 1,454,300,000 1,425,700,000 1,433,947,000 1,518,940,000 1,468,388,000 1,431,325,000 1,264,431,000 845,440,000 800,230,000 755,207,000 736,579,000 723,473,000 712,468,000 671,357,000 654,306,000 670,824,000 665,481,000 629,500,000 626,651,000 642,764,000 615,459,000 550,732,000 532,257,000 553,573,000 549,381,000 512,378,000 546,051,000 620,785,000 616,183,000    585,628,000 559,159,000 553,054,000 575,041,000 551,095,000 507,856,000 472,709,000 512,187,000 519,325,000 489,437,000 492,650,000 498,753,000 467,393,000 431,267,000 431,197,000 444,599,000 436,470,000       
      yoy
    10.59% 10.13% 6.00% 4.63% 8.16% 10.74% 12.73% 6.31% 0.16% -2.05% -8.93% -12.75% -7.49% -3.17% 6.29% 19.01% 18.22% 19.19% 18.09% 21.94% 5.76% -0.34% -3.26% -12.40% -1.44% -1.52% -3.27% -0.43% 2.55% 3.69% 10.35% 11.58% 10.03% 14.07% 10.52% 11.75% 9.67% 6.16% 0.90% -2.54% -1.73% -3.00% -3.17% -0.96% -0.39% 13.41% 79.66% 83.50% 89.53% 71.66% 16.86% 12.32% 12.49% 12.57% 7.85% 7.06% 6.65% 4.41% 4.37% 8.13% 14.30% 17.73% 16.11% 12.03% 7.49% -2.53% -10.83% -10.84%    5.22%    6.27% 10.10% 17.00% 12.27% 6.12% 3.76% -4.05% 2.69% 11.11% 13.49% 14.25% 12.18% 7.08%           
      qoq
    0.18% 2.17% 6.54% 1.42% -0.24% -1.66% 5.16% 4.84% 2.15% 0.10% -0.82% -1.22% -0.11% -6.94% -4.98% 4.72% 4.56% 2.15% 6.39% 4.02% 5.43% 1.21% 9.87% -9.78% -0.66% -1.75% -0.52% 1.51% -0.73% -3.50% 2.40% 4.55% 0.37% 2.69% 3.54% 3.09% 4.06% -0.50% 4.70% 1.17% 0.73% -5.43% 1.13% 2.01% -0.58% -5.60% 3.44% 2.59% 13.20% 49.56% 5.65% 5.96% 2.53% 1.81% 1.54% 6.12% 2.61% -2.46% 0.80% 5.72% 0.45% -2.51% 4.44% 11.75% 3.47% -3.85% 0.76% 7.22% -6.17% -12.04% 0.75%     4.73% 1.10% -3.82% 4.35% 8.51% 7.44% -7.71% -1.37% 6.11% -0.65% -1.22% 6.71% 8.38% 0.02% -3.01% 1.86%        
      cost of sales
    -1,914,900,000 -1,916,100,000 -1,809,100,000 -1,688,300,000 -1,686,300,000 -1,676,400,000 -1,677,200,000 -1,637,600,000 -1,609,100,000 -1,527,800,000 -1,523,300,000 -1,507,400,000 -1,544,900,000 -1,528,100,000 -1,607,500,000 -1,648,500,000 -1,603,200,000 -1,533,300,000 -1,489,400,000 -1,431,100,000 -1,403,500,000 -1,380,900,000 -1,348,300,000 -1,215,800,000 -1,343,700,000 -1,336,700,000 -1,339,300,000 -1,332,000,000 -1,312,300,000 -1,321,100,000 -1,366,700,000 -1,346,900,000 -1,334,500,000 -1,312,600,000 -1,242,800,000 -1,219,400,000 -1,198,000,000 -1,149,500,000 -1,154,500,000 -1,097,300,000 -1,102,400,000 -1,105,800,000 -1,142,500,000 -1,130,600,000 -1,148,700,000 -1,136,992,000 -1,198,607,000 -1,157,580,000 -1,129,921,000 -1,005,612,000 -619,626,000 -608,107,000 -572,776,000 -562,629,000 -560,921,000 -554,360,000 -526,338,000 -520,149,000 -533,077,000 -528,580,000 -496,359,000 -479,367,000 -476,312,000 -483,794,000 -463,933,000 -444,719,000 -443,041,000 -430,882,000 -402,370,000 -431,890,000 -488,890,000 -488,960,000                           
      gross profit
    452,900,000 447,500,000 504,300,000 483,000,000 454,700,000 469,700,000 505,200,000 437,700,000 370,400,000 410,100,000 412,700,000 444,700,000 431,400,000 450,300,000 518,400,000 588,800,000 533,200,000 509,900,000 510,700,000 448,800,000 403,700,000 333,300,000 345,400,000 325,800,000 365,000,000 383,300,000 411,400,000 427,900,000 421,400,000 425,400,000 443,200,000 420,600,000 356,100,000 371,700,000 397,300,000 364,600,000 338,500,000 327,100,000 329,500,000 320,100,000 298,600,000 285,100,000 328,300,000 323,700,000 277,000,000 296,955,000 320,333,000 310,808,000 301,404,000 258,819,000 225,814,000 192,123,000 182,431,000 173,950,000 162,552,000 158,108,000 145,019,000 134,157,000 137,747,000 136,901,000 133,141,000 147,284,000 166,452,000 131,665,000 86,799,000 87,538,000 110,532,000 118,499,000 110,008,000 114,161,000 131,895,000 127,223,000    140,110,000 112,987,000 123,473,000 134,688,000 112,138,000 73,578,000 57,129,000 80,501,000 95,915,000 73,266,000 84,943,000 99,731,000 72,824,000 40,216,000 67,451,000 78,852,000 78,926,000       
      yoy
    -0.40% -4.73% -0.18% 10.35% 22.76% 14.53% 22.41% -1.57% -14.14% -8.93% -20.39% -24.47% -19.09% -11.69% 1.51% 31.19% 32.08% 52.99% 47.86% 37.75% 10.60% -13.04% -16.04% -23.86% -13.38% -9.90% -7.18% 1.74% 18.34% 14.45% 11.55% 15.36% 5.20% 13.63% 20.58% 13.90% 13.36% 14.73% 0.37% -1.11% 7.80% -3.99% 2.49% 4.15% -8.10% 14.73% 41.86% 61.78% 65.22% 48.79% 38.92% 21.51% 25.80% 29.66% 18.01% 15.49% 8.92% -8.91% -17.25% 3.98% 53.39% 68.25% 50.59% 11.11% -21.10% -23.32% -16.20% -6.86%    -9.20%    24.94% 53.56% 116.13% 67.31% 16.91% 0.43% -32.74% -19.28% 31.71% 82.18% 25.93% 26.48% -7.73%           
      qoq
    1.21% -11.26% 4.41% 6.22% -3.19% -7.03% 15.42% 18.17% -9.68% -0.63% -7.20% 3.08% -4.20% -13.14% -11.96% 10.43% 4.57% -0.16% 13.79% 11.17% 21.12% -3.50% 6.02% -10.74% -4.77% -6.83% -3.86% 1.54% -0.94% -4.02% 5.37% 18.11% -4.20% -6.44% 8.97% 7.71% 3.49% -0.73% 2.94% 7.20% 4.74% -13.16% 1.42% 16.86% -6.72% -7.30% 3.06% 3.12% 16.45% 14.62% 17.54% 5.31% 4.88% 7.01% 2.81% 9.03% 8.10% -2.61% 0.62% 2.82% -9.60% -11.52% 26.42% 51.69% -0.84% -20.80% -6.72% 7.72% -3.64% -13.45% 3.67%     24.01% -8.49% -8.33% 20.11% 52.41% 28.79% -29.03% -16.07% 30.91% -13.75% -14.83% 36.95% 81.08% -40.38% -14.46% -0.09%        
      gross margin %
    19.13% 18.93% 21.80% 22.24% 21.24% 21.89% 23.15% 21.09% 18.71% 21.16% 21.32% 22.78% 21.83% 22.76% 24.38% 26.32% 24.96% 24.96% 25.53% 23.87% 22.34% 19.44% 20.39% 21.13% 21.36% 22.28% 23.50% 24.31% 24.31% 24.36% 24.49% 23.80% 21.06% 22.07% 24.22% 23.02% 22.03% 22.15% 22.20% 22.58% 21.31% 20.50% 22.32% 22.26% 19.43% 20.71% 21.09% 21.17% 21.06% 20.47% 26.71% 24.01% 24.16% 23.62% 22.47% 22.19% 21.60% 20.50% 20.53% 20.57% 21.15% 23.50% 25.90% 21.39% 15.76% 16.45% 19.97% 21.57% 21.47% 20.91% 21.25% 20.65% NaN% NaN% NaN% 23.92% 20.21% 22.33% 23.42% 20.35% 14.49% 12.09% 15.72% 18.47% 14.97% 17.24% 20.00% 15.58% 9.33% 15.64% 17.74% 18.08% NaN% NaN% NaN% NaN% NaN%  
      selling, general and administrative expenses
    -180,300,000 -165,300,000 -154,300,000 -153,200,000 -161,400,000 -147,000,000 -162,000,000 -149,500,000 -151,900,000 -109,525,000 -144,200,000 -145,600,000 -148,200,000 -115,725,000 -145,200,000 -156,700,000 -161,100,000 -108,925,000 -144,500,000 -146,300,000 -145,000,000 -102,325,000 -127,100,000 -136,300,000 -145,900,000 -105,150,000 -136,900,000 -143,700,000 -140,000,000 -101,675,000 -134,200,000 -137,700,000 -134,900,000                                                                  
      other expense
    -21,300,000 -113,700,000 -25,500,000  -13,000,000 -20,500,000 -16,100,000 -12,200,000 -22,500,000 -5,800,000 -9,900,000 -14,700,000 -12,500,000 -16,600,000 -12,900,000 -16,300,000 -15,600,000 -13,100,000 -13,400,000 -7,900,000 -20,400,000 -13,800,000 -8,800,000 -18,200,000 -10,000,000   -3,800,000    -13,300,000 -8,300,000            -2,600,000 -11,001,000 -12,310,000         -3,646,000 -2,579,000 -1,263,000 -1,229,000       -2,720,000 -3,892,000 -4,265,000 -3,658,000 -3,385,000 -2,670,000 -5,551,000                           
      income from operations
    251,300,000 168,500,000 324,500,000 333,700,000 280,300,000 302,200,000 327,100,000 276,000,000 196,000,000 261,500,000 258,600,000 284,400,000 270,700,000 288,000,000 360,300,000 415,800,000 356,500,000 355,700,000 352,800,000 294,600,000 238,300,000 189,200,000 209,500,000 116,100,000 209,100,000 235,100,000 262,800,000 280,400,000 275,400,000 286,700,000 298,500,000 269,600,000 212,900,000 252,000,000 242,300,000 233,800,000 203,100,000 192,900,000 206,400,000 200,200,000 180,800,000 175,900,000 219,400,000 197,600,000 157,100,000 173,166,000 188,378,000 180,248,000 160,908,000 121,131,000 141,960,000 107,270,000 103,246,000 98,419,000 92,072,000 83,858,000 169,110,000 67,807,000 71,180,000 67,859,000 65,903,000 96,362,000 -12,342,000 67,746,000 33,616,000 70,799,000 96,331,000 135,717,000 49,607,000 51,788,000 68,705,000 64,173,000    80,224,000 56,696,000 68,847,000 76,791,000 57,806,000 22,483,000 8,012,000 26,302,000 54,280,000 27,532,000              
      yoy
    -10.35% -44.24% -0.79% 20.91% 43.01% 15.56% 26.49% -2.95% -27.60% -9.20% -28.23% -31.60% -24.07% -19.03% 2.13% 41.14% 49.60% 88.00% 68.40% 153.75% 13.96% -19.52% -20.28% -58.59% -24.07% -18.00% -11.96% 4.01% 29.36% 13.77% 23.19% 15.31% 4.83% 30.64% 17.39% 16.78% 12.33% 9.66% -5.93% 1.32% 15.09% 1.58% 16.47% 9.63% -2.37% 42.96% 32.70% 68.03% 55.85% 23.08% 54.18% 27.92% -38.95% 45.15% 29.35% 23.58% 156.60% -29.63% -676.73% 0.17% 96.05% 36.11% -112.81% -50.08% -32.24% 36.71% 40.21% 111.49%    -20.01%    38.78% 152.17% 759.30% 191.96% 6.50% -18.34%                  
      qoq
    49.14% -48.07% -2.76% 19.05% -7.25% -7.61% 18.51% 40.82% -25.05% 1.12% -9.07% 5.06% -6.01% -20.07% -13.35% 16.63% 0.22% 0.82% 19.76% 23.63% 25.95% -9.69% 80.45% -44.48% -11.06% -10.54% -6.28% 1.82% -3.94% -3.95% 10.72% 26.63% -15.52% 4.00% 3.64% 15.12% 5.29% -6.54% 3.10% 10.73% 2.79% -19.83% 11.03% 25.78% -9.28% -8.08% 4.51% 12.02% 32.84% -14.67% 32.34% 3.90% 4.90% 6.89% 9.80% -50.41% 149.40% -4.74% 4.89% 2.97% -31.61% -880.76% -118.22% 101.53% -52.52% -26.50% -29.02% 173.58% -4.21% -24.62% 7.06%     41.50% -17.65% -10.34% 32.84% 157.11% 180.62% -69.54% -51.54% 97.15%               
      operating margin %
    10.61% 7.13% 14.03% 15.37% 13.09% 14.08% 14.99% 13.30% 9.90% 13.49% 13.36% 14.57% 13.70% 14.56% 16.95% 18.58% 16.69% 17.41% 17.64% 15.67% 13.19% 11.04% 12.37% 7.53% 12.24% 13.67% 15.01% 15.93% 15.89% 16.42% 16.49% 15.25% 12.59% 14.96% 14.77% 14.76% 13.22% 13.06% 13.91% 14.12% 12.91% 12.65% 14.92% 13.59% 11.02% 12.08% 12.40% 12.28% 11.24% 9.58% 16.79% 13.40% 13.67% 13.36% 12.73% 11.77% 25.19% 10.36% 10.61% 10.20% 10.47% 15.38% -1.92% 11.01% 6.10% 13.30% 17.40% 24.70% 9.68% 9.48% 11.07% 10.41% NaN% NaN% NaN% 13.70% 10.14% 12.45% 13.35% 10.49% 4.43% 1.69% 5.14% 10.45% 5.63% 0% 0% 0% 0% 0% 0% 0% NaN% NaN% NaN% NaN% NaN%  
      non-operating pension income
    1,100,000     1,100,000 1,200,000 1,100,000 1,100,000 -1,900,000 -1,800,000 -2,000,000 -2,000,000 3,600,000 3,600,000 3,600,000 3,600,000 4,900,000 5,000,000 5,000,000 4,800,000 600,000 600,000 600,000 600,000                                                                          
      interest expense
    -32,600,000 -33,900,000 -19,300,000 -13,100,000 -12,900,000 -11,700,000 -9,700,000 -10,400,000 -9,600,000 -11,100,000 -12,300,000 -14,600,000 -15,400,000 -15,100,000 -16,500,000 -18,800,000 -19,800,000 -80,200,000 -23,900,000 -24,900,000 -23,500,000 -24,400,000 -24,400,000 -25,100,000 -19,600,000 -60,800,000 -21,600,000 -22,400,000 -24,100,000     -28,000,000 -25,400,000 -25,200,000 -24,000,000 -24,300,000 -23,400,000 -22,500,000 -21,600,000 -22,300,000 -21,700,000 -22,200,000 -19,200,000 -23,089,000 -23,111,000 -21,409,000 -20,791,000 -27,942,000 -11,850,000 -9,232,000 -9,251,000 -9,371,000 -30,590,000 -13,256,000 -9,683,000 -9,294,000 -6,727,000 -6,321,000 -6,903,000 -7,559,000 -7,903,000 -8,093,000 -8,723,000 -8,954,000 -8,961,000 -8,830,000 -8,738,000 -9,098,000 -8,071,000 -8,197,000                           
      income before taxes
    219,800,000 134,500,000 305,200,000 320,600,000 267,400,000 291,600,000 318,600,000 266,700,000 187,500,000 248,500,000 244,500,000 267,800,000 253,300,000 276,500,000 347,400,000 400,600,000 340,300,000 280,400,000 333,900,000 274,700,000 219,600,000 165,400,000 185,700,000 91,600,000 190,100,000 172,400,000 239,300,000 256,000,000 249,300,000 264,500,000 274,100,000 245,300,000 186,600,000 224,000,000 216,900,000 208,600,000 179,100,000 168,600,000 183,000,000 177,700,000 159,200,000 153,600,000 197,700,000 175,400,000 137,900,000 150,077,000 165,267,000 158,839,000 140,117,000 93,189,000 130,110,000 98,038,000 93,995,000 89,048,000 61,482,000 70,602,000 159,427,000 58,513,000 64,453,000 61,538,000 59,000,000 88,803,000 -20,245,000 59,653,000 24,893,000 61,845,000 87,370,000 126,887,000 40,869,000 42,690,000 60,634,000 55,976,000    73,296,000 49,564,000 61,749,000 68,946,000 49,596,000 14,433,000 1,072,000 19,220,000 47,204,000 20,538,000 56,880,000 42,425,000 22,624,000    17,599,000       
      provision for income taxes
    -48,900,000 -32,700,000 -78,300,000 -79,100,000 -63,600,000 -70,500,000 -80,500,000 -67,800,000 -40,600,000 -59,300,000 -61,300,000 -65,100,000 -63,200,000 -64,900,000 -84,900,000 -99,100,000 -86,100,000 -63,900,000 -83,200,000 -67,400,000 -53,100,000 -41,800,000 -46,600,000 -34,900,000 -48,400,000   -62,400,000    -58,700,000 -46,500,000                       -25,448,000 -141,583,000         -3,162,000 -14,715,000 -18,006,000 -15,193,000 -12,448,000 -22,532,000 -20,784,000                           
      net income
    170,900,000 101,800,000 226,900,000 241,500,000 203,800,000 221,100,000 238,100,000 198,900,000 146,900,000 189,200,000 183,200,000 202,700,000 190,100,000 211,600,000 262,500,000 301,500,000 254,200,000 216,500,000 250,700,000 207,300,000 166,500,000 123,600,000 139,100,000 56,700,000 141,700,000 136,200,000 179,800,000 193,600,000 186,800,000 204,600,000 206,700,000 186,600,000 140,100,000 268,900,000 139,100,000 143,200,000 117,400,000 110,700,000 119,300,000 115,900,000 103,700,000 104,200,000 127,800,000 114,000,000 90,800,000 98,512,000 104,445,000 99,557,000 90,086,000 227,025,000 84,180,000 64,465,000 60,613,000 61,031,000 39,791,000 45,154,000 17,844,000 39,465,000 41,777,000 39,368,000 37,417,000 54,891,000 93,320,000 38,030,000 19,194,000 58,683,000 72,655,000 108,881,000 25,676,000 30,242,000 38,102,000 35,192,000    46,227,000 31,191,000 40,052,000 43,748,000 32,245,000 8,987,000 1,659,000 10,566,000 27,760,000 12,619,000 36,267,000 25,673,000 13,626,000 -6,836,000 177,000 -32,336,000 10,674,000       
      yoy
    -16.14% -53.96% -4.70% 21.42% 38.73% 16.86% 29.97% -1.87% -22.72% -10.59% -30.21% -32.77% -25.22% -2.26% 4.71% 45.44% 52.67% 75.16% 80.23% 265.61% 17.50% -9.25% -22.64% -70.71% -24.14% -33.43% -13.01% 3.75% 33.33% -23.91% 48.60% 30.31% 19.34% 142.91% 16.60% 23.55% 13.21% 6.24% -6.65% 1.67% 14.21% 5.77% 22.36% 14.51% 0.79% -56.61% 24.07% 54.44% 48.62% 271.98% 111.56% 42.77% 239.68% 54.65% -4.75% 14.70% -52.31% -28.10% -55.23% 3.52% 94.94% -6.46% 28.44% -65.07% -25.25% 94.04% 90.69% 209.39%    -23.87%    43.36% 247.07% 2314.23% 314.05% 16.16% -28.78% -95.43% -58.84% 103.73% -284.60% 20389.83% -179.39% 27.66%           
      qoq
    67.88% -55.13% -6.05% 18.50% -7.82% -7.14% 19.71% 35.40% -22.36% 3.28% -9.62% 6.63% -10.16% -19.39% -12.94% 18.61% 17.41% -13.64% 20.94% 24.50% 34.71% -11.14% 145.33% -59.99% 4.04% -24.25% -7.13% 3.64% -8.70% -1.02% 10.77% 33.19% -47.90% 93.31% -2.86% 21.98% 6.05% -7.21% 2.93% 11.76% -0.48% -18.47% 12.11% 25.55% -7.83% -5.68% 4.91% 10.51% -60.32% 169.69% 30.58% 6.36% -0.68% 53.38% -11.88% 153.05% -54.79% -5.53% 6.12% 5.21% -31.83% -41.18% 145.39% 98.13% -67.29% -19.23% -33.27% 324.06% -15.10% -20.63% 8.27%     48.21% -22.12% -8.45% 35.67% 258.80% 441.71% -84.30% -61.94% 119.99% -65.21% 41.27% 88.41% -299.33% -3962.15% -100.55% -402.94%        
      net income margin %
    7.22% 4.31% 9.81% 11.12% 9.52% 10.30% 10.91% 9.58% 7.42% 9.76% 9.46% 10.38% 9.62% 10.70% 12.35% 13.48% 11.90% 10.60% 12.53% 11.03% 9.21% 7.21% 8.21% 3.68% 8.29% 7.92% 10.27% 11.00% 10.77% 11.71% 11.42% 10.56% 8.29% 15.97% 8.48% 9.04% 7.64% 7.50% 8.04% 8.18% 7.40% 7.49% 8.69% 7.84% 6.37% 6.87% 6.88% 6.78% 6.29% 17.95% 9.96% 8.06% 8.03% 8.29% 5.50% 6.34% 2.66% 6.03% 6.23% 5.92% 5.94% 8.76% 14.52% 6.18% 3.49% 11.03% 13.12% 19.82% 5.01% 5.54% 6.14% 5.71% NaN% NaN% NaN% 7.89% 5.58% 7.24% 7.61% 5.85% 1.77% 0.35% 2.06% 5.35% 2.58% 7.36% 5.15% 2.92% -1.59% 0.04% -7.27% 2.45% NaN% NaN% NaN% NaN% NaN%  
      net income per common share:
                                                                                                      
      basic
    1,920,000 1,130,000 2,520,000 2,680,000 2,270,000 2,460,000 2,650,000 2,220,000 1,640,000 2,110,000 2,040,000 2,250,000 2,120,000 2,340,000 2,810,000 3,220,000 2,710,000 2,290,000 2,640,000 2,180,000 1,750,000 1,300,000 1,470,000 600,000 1,500,000 1,430,000 1,900,000 2,050,000 1,980,000 2,170,000 2,190,000 1,980,000 1,480,000 2,850,000 1,470,000 1,520,000 1,250,000 1,170,000 1,270,000 1,230,000 1,090,000 1,080,000 1,310,000 1,160,000 920,000 3,987,010 1,060 1,010 920 2,350 870 670 630 630 410 470 180 400 420 390 370 540 920 370 190 580 710 1,070 250 300 370 340    440 300 390 420 310 90 20 100 260 120 340 240 130 -60          
      diluted
    1,910,000 1,130,000 2,510,000 2,670,000 2,260,000 2,450,000 2,640,000 2,210,000 1,630,000 2,100,000 2,030,000 2,240,000 2,110,000 2,330,000 2,800,000 3,200,000 2,700,000 2,280,000 2,630,000 2,170,000 1,750,000 1,300,000 1,460,000 590,000 1,490,000 1,430,000 1,890,000 2,040,000 1,970,000 2,160,000 2,180,000 1,970,000 1,480,000 2,840,000 1,470,000 1,520,000 1,240,000 1,170,000 1,260,000 1,230,000 1,090,000 1,080,000 1,310,000 1,160,000 920,000 3,987,010 1,060 1,010 920 2,320 860 660 620 630 410 460 180 400 420 390 370 540 910 370 190 570 710 1,070 250 300 370 340    440 300 390 420 310 90 20 100 260 120 340 240 130 -60          
      dividends declared per common share
    1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,250,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 790,000 790,000 790,000 790,000 790,000 790,000 790,000 790,000 790,000 790,000 630,000 630,000 630,000 630,000 630,000 630,000 630,000 550,000 550,000 550,000 550,000 550,000 550,000 1,598,800 400 400 400 397.5 400 400 312.5 250 250 250 250 200 200 200 200 150 150 150 150 150 150 150 150 300 300 300    250 250 250 250 250 250 250 250 250 250 150 150 150 150          
      statements of comprehensive income:
                                                                                                      
      other comprehensive income, net of tax:
                                                                                                      
      changes in unrealized gains on marketable debt securities, net of tax of 0.1 million and 0.0 million for 2026 and 2025, respectively
    -400,000                                                                                                  
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.3) million for both 2026 and 2025
    1,000,000                                                                                                  
      other comprehensive income
    600,000 -1,200,000 1,000,000 900,000 1,100,000 23,600,000 2,000,000 1,000,000 900,000 25,800,000 2,000,000 1,600,000 2,100,000 -28,600,000 600,000 800,000  61,600,000 2,900,000 2,400,000 2,400,000 6,400,000 2,500,000 3,600,000 2,500,000 -30,700,000 3,400,000 3,300,000 3,300,000 6,300,000 4,000,000 4,000,000 3,900,000 -25,900,000 2,900,000 2,800,000 2,900,000 -25,400,000 2,700,000 5,500,000 2,500,000 17,100,000 3,000,000 7,300,000 1,600,000 -92,980,000 386,000 1,873,000 1,821,000 21,070,000 9,220,000 15,970,000 2,758,000  1,067,000 -14,170,000 8,913,000                                          
      comprehensive income
    171,500,000 100,600,000 227,900,000 242,400,000 204,900,000 244,700,000 240,100,000 199,900,000 147,800,000 215,000,000 185,200,000 204,300,000 192,200,000 183,000,000 263,100,000 302,300,000 254,200,000 278,100,000 253,600,000 209,700,000 168,900,000 130,000,000 141,600,000 60,300,000 144,200,000 105,500,000 183,200,000 196,900,000 190,100,000 210,900,000 210,700,000 190,600,000 144,000,000 243,000,000 142,000,000 146,000,000 120,300,000   121,400,000 106,200,000 121,300,000 130,800,000 121,300,000 92,400,000 5,532,000 104,831,000 101,430,000 91,907,000 248,095,000 93,400,000 80,435,000 63,371,000 48,957,000 40,858,000 30,984,000 26,757,000                                          
      changes in unrealized gains on marketable debt securities, net of tax of 0.0 million, (0.3) million, (0.1) million, and (0.3) million, respectively
     50,000                                                                                                 
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.3) million, (0.4) million, (0.9) million, and (1.0) million, respectively
     700,000 1,000,000                                                                                                
      other income
       3,900,000                      -11,200,000 -11,700,000  -6,000,000 -9,000,000 -10,500,000   14,000,000 -24,800,000 -600,000 -7,000,000 -9,100,000 -6,200,000 -5,100,000 -3,900,000 -725,000 3,800,000 -4,200,000    -7,712,000 -23,982,000 -37,947,000 -6,242,000 -10,828,000 -3,961,000 -3,603,000 -1,961,000     -4,498,000 -3,733,000 -6,394,000 -4,179,000 -3,880,000 -5,511,000                                  
      changes in unrealized gains on marketable debt securities, net of tax 0.0 million for all periods presented in 2025 and 2024
                                                                                                      
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.3) million, (0.3) million, (0.6) million, and (0.7) million, respectively
       900,000                                                                                               
      changes in unrealized gains on marketable debt securities, net of tax 0.0 million for both 2025 and 2024
        100,000                                                                                              
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.3) million and (0.4) million for 2025 and 2024, respectively
        1,000,000                                                                                              
      changes in unrealized gains on marketable debt securities, net of tax of (0.3) million, (0.1) million, (0.3) million, and (0.3) million, respectively
         200,000 1,000,000                                                                                            
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.4) million, (0.5) million, (1.0) million, and (1.6) million, respectively
         775,000 1,000,000                                                                                            
      changes in unrealized losses on marketable debt securities, net of tax of 0.0 million, 0.0 million, 0.0 million, and (0.2) million, respectively
           -100,000                                                                                           
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.3) million, (0.6) million, (0.7) million, and (1.1) million, respectively
           1,100,000                                                                                           
      changes in unrealized gains on marketable debt securities, net of tax of 0.0 million and (0.2) million for 2024 and 2023, respectively
            -100,000                                                                                          
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.4) million and (0.6) million for 2024 and 2023, respectively
            1,000,000                                                                                          
      changes in unrealized gains on marketable debt securities, net of tax of (0.1) million, 0.2 million, (0.3) million, and 0.7 million, respectively
             225,000 400,000                                                                                        
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.5) million, (0.4) million, (1.6) million, and (1.2) million, respectively
             1,200,000 1,600,000                                                                                        
      changes in unrealized gains on marketable debt securities, net of tax of 0.0 million, 0.1 million, (0.2) million, and 0.5 million, respectively
                                                                                                      
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.6) million, (0.4) million, (1.1) million, and (0.7) million, respectively
               1,600,000                                                                                       
      changes in unrealized gains on marketable debt securities, net of tax of (0.2) million and 0.4 million for 2023 and 2022, respectively
                500,000                                                                                      
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.6) million and (0.3) million for 2023 and 2022, respectively
                1,600,000                                                                                      
      foreign currency translation adjustment
                      400,000              -100,000  100,000 -100,000 -200,000     -100,000  4,200,000 -1,400,000                                                      
      changes in unrealized losses on marketable debt securities, net of tax of 0.2 million, 0.0 million, 0.7 million, and 0.1 million
                 -525,000 -600,000                                                                                    
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.4) million, (0.8) million, (1.2) million, and (2.5) million
                 875,000 1,200,000                                                                                    
      changes in unrealized losses on marketable debt securities, net of tax of 0.1 million, 0.0 million, 0.5 million, and 0.1 million
                   -300,000                                                                                   
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.4) million, (0.8) million, (0.7) million, and (1.7) million
                   1,100,000                                                                                   
      changes in unrealized losses on marketable debt securities, net of tax of 0.4 million and 0.0 million for 2022 and 2021, respectively
                    -1,200,000                                                                                  
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of (0.3) million and (0.8) million for 2022 and 2021, respectively
                    1,200,000                                                                                  
      goodwill impairment
                           -55,200,000                                                                           
      changes in unrealized gains on marketable debt securities, net of tax of 0.0 million, 0.1 million, 0.1 million, and 0.2 million
                     -50,000                                                                                 
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.8 million, 0.9 million, 2.5 million, and 2.7 million
                     1,875,000 2,500,000                                                                                
      changes in unrealized gains on marketable debt securities, net of tax of 0.0 million, 0.3 million, 0.1 million, and 0.2 million
                       -100,000                                                                               
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.8 million, 0.9 million, 1.7 million, and 1.8 million
                       2,500,000                                                                               
      changes in unrealized losses on marketable debt securities, net of tax of 0.0 million and 0.1 million, for 2021 and 2020, respectively
                        -100,000                                                                              
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.8 million and 0.9 million, for 2021 and 2020, respectively
                        2,500,000                                                                              
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.0 million, 0.3 million, 0.0 million, and 1.0 million
                                                                                                      
      changes in unrealized gains on marketable debt securities, net of tax of 0.1 million, 0.0 million, 0.2 million, and 0.0 million
                         125,000 -200,000                                                                            
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.9 million, 0.8 million, 2.7 million, and 2.4 million
                         2,025,000 2,700,000                                                                            
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.0 million, 0.3 million, 0.0 million, and 0.7 million
                                                                                                      
      changes in unrealized gains on marketable debt securities, net of tax of 0.3 million, 0.0 million, 0.2 million, and 0.0 million
                           900,000                                                                           
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.9 million, 0.8 million, 1.8 million, and 1.6 million
                           2,700,000                                                                           
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.0 million and 0.3 million
                                                                                                      
      changes in unrealized losses on marketable debt securities, net of tax of 0.1 million and 0.0 million
                            -200,000                                                                          
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.9 million and 0.8 million
                            2,700,000                                                                          
      non-operating pension expense
                             -1,900,000 -1,900,000 -2,000,000 -2,000,000                                                                      
      benefit from income taxes
                             -36,200,000 -59,500,000  -62,500,000 -43,150,000 -67,400,000   44,900,000 -77,800,000 -65,400,000              -28,221,250 -45,930,000 -33,573,000 -33,382,000 -47,180,500 -21,691,000     -22,170,000 -21,583,000   -21,623,000 -5,699,000                                  
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.3 million, 0.3 million, 1.0 million, and 1.0 million
                             725,000 1,000,000                                                                        
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.8 million, 1.0 million, 2.4 million, and 3.0 million
                             1,775,000 2,400,000                                                                        
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.3 million, 0.3 million, 0.7 million, and 0.7 million
                               1,000,000                                                                       
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.8 million, 1.0 million, 1.6 million, and 1.9 million
                               2,300,000                                                                       
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.3 million and 0.4 million
                                1,000,000                                                                      
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 0.8 million and 1.0 million
                                2,300,000                                                                      
      interest expense, net and other
                                 -22,200,000 -24,400,000 -24,300,000 -26,300,000                                                                  
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.3 million, 0.5 million, 1.0 million, and 1.6 million
                                 750,000 1,000,000                                                                    
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.0 million, 1.2 million, 3.0 million, and 3.7 million
                                 2,225,000 3,000,000                                                                    
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.3 million, 0.6 million, 0.7 million, and 1.2 million
                                   1,000,000                                                                   
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.0 million, 1.2 million, 1.9 million, and 2.3 million
                                   3,000,000                                                                   
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.4 million and 0.5 million
                                    1,000,000                                                                  
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.0 million and 1.2 million
                                    3,000,000                                                                  
      selling, general, and administrative expenses
                                     -97,225,000 -130,200,000 -130,200,000 -128,400,000 -125,100,000 -116,900,000 -114,800,000 -113,900,000 -105,400,000 -112,700,000 -121,900,000 -117,300,000 -110,493,000 -119,645,000 -122,848,000 -116,514,000                                                  
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.5 million, 0.5 million, 1.6 million, and 1.6 million
                                     650,000 900,000   650,000 900,000   650,000 900,000                                                        
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.2 million, 1.0 million, 3.7 million, and 3.1 million
                                     1,550,000 1,900,000                                                                
      changes in unfunded employee benefit obligation net of tax of 2.0 million
                                                                                                      
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.6 million, 0.6 million, 1.2 million, and 1.1 million
                                       800,000                                                               
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.2 million, 1.0 million, 2.3 million, and 2.0 million
                                       2,100,000                                                               
      changes in unfunded employee benefit obligation net of tax of 0.0 million, 2.0 million, 0.0 million and 2.0 million
                                                                                                      
      income tax provision
                                        -61,700,000 -45,250,000 -63,700,000 -61,800,000 -55,500,000 -44,575,000 -69,900,000 -61,400,000 -47,100,000 -42,533,750 -60,822,000 -59,282,000 -50,031,000                                                  
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.5 million and 0.5 million
                                        900,000                                                              
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.2 million and 1.0 million
                                        2,200,000                                                              
      less net income attributable to noncontrolling interests
                                                                                                      
      net income attributable to packaging corporation of america
                                         84,725,000 119,300,000                                                            
      net income per common share attributable to packaging corporation of america common shareholders:
                                                                                                      
      basic
    1,920,000 1,130,000 2,520,000 2,680,000 2,270,000 2,460,000 2,650,000 2,220,000 1,640,000 2,110,000 2,040,000 2,250,000 2,120,000 2,340,000 2,810,000 3,220,000 2,710,000 2,290,000 2,640,000 2,180,000 1,750,000 1,300,000 1,470,000 600,000 1,500,000 1,430,000 1,900,000 2,050,000 1,980,000 2,170,000 2,190,000 1,980,000 1,480,000 2,850,000 1,470,000 1,520,000 1,250,000 1,170,000 1,270,000 1,230,000 1,090,000 1,080,000 1,310,000 1,160,000 920,000 3,987,010 1,060 1,010 920 2,350 870 670 630 630 410 470 180 400 420 390 370 540 920 370 190 580 710 1,070 250 300 370 340    440 300 390 420 310 90 20 100 260 120 340 240 130 -60          
      diluted
    1,910,000 1,130,000 2,510,000 2,670,000 2,260,000 2,450,000 2,640,000 2,210,000 1,630,000 2,100,000 2,030,000 2,240,000 2,110,000 2,330,000 2,800,000 3,200,000 2,700,000 2,280,000 2,630,000 2,170,000 1,750,000 1,300,000 1,460,000 590,000 1,490,000 1,430,000 1,890,000 2,040,000 1,970,000 2,160,000 2,180,000 1,970,000 1,480,000 2,840,000 1,470,000 1,520,000 1,240,000 1,170,000 1,260,000 1,230,000 1,090,000 1,080,000 1,310,000 1,160,000 920,000 3,987,010 1,060 1,010 920 2,320 860 660 620 630 410 460 180 400 420 390 370 540 910 370 190 570 710 1,070 250 300 370 340    440 300 390 420 310 90 20 100 260 120 340 240 130 -60          
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.0 million, 1.4 million, 3.1 million, and 4.2 million
                                         1,250,000 1,800,000                                                            
      changes in unfunded employee benefit obligations net of tax of 2.0 million
                                         775,000                                                             
      comprehensive income attributable to packaging corporation of america
                                         87,400,000 122,000,000                                                            
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.6 million, 0.5 million, 1.1 million, and 1.1 million
                                           800,000                                                           
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.0 million, 1.4 million, 2.0 million, and 2.8 million
                                           1,600,000                                                           
      changes in unfunded employee benefit obligations net of tax of 2.0 million and 2.0 million
                                           3,100,000                                                           
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.5 million and 0.6 million
                                            900,000                                                          
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.0 million and 1.4 million
                                            1,600,000                                                          
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.4 million, 0.7 million, 4.2 million, and 2.2 million
                                             1,625,000 2,100,000                                                        
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.5 million, 0.5 million, 1.1 million, and 1.1 million
                                               900,000                                                       
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.4 million, 0.7 million, 2.8 million, and 1.5 million
                                               2,200,000                                                       
      reclassification adjustments to cash flow hedges included in net income, net of tax of 0.6 million and 0.6 million
                                                800,000                                                      
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 1.4 million and 0.8 million
                                                2,200,000                                                      
      foreign currency translation adjustment, net of tax of (106), 0, (76), and 0, respectively
                                                 -414,000 -1,564,000                                                    
      reclassification adjustments to cash flow hedges included in net income, net of tax of 553, 552, 1,668, and 1,658, respectively
                                                 649,750 870,000                                                    
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 685, 2,153, 2,157, and 7,574, respectively
                                                 784,250 1,080,000                                                    
      changes in unfunded employee benefit obligation, net of tax of 0, 3,152, 0, and 8,522, respectively
                                                                                                      
      foreign currency translation adjustment, net of tax of 70, 0, 30, and 0, respectively
                                                   -74,000                                                   
      reclassification adjustments to cash flow hedges included in net income, net of tax of 553, 553, 1,115, and 1,105, respectively
                                                   869,000                                                   
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 688, 4,221, 1,472, and 5,421, respectively
                                                   1,078,000                                                   
      changes in unfunded employee benefit obligation, net of tax of 0, 5,370, 0, and 5,370, respectively
                                                                                                      
      foreign currency translation adjustment, net of tax of 40 and 0, respectively
                                                    -18,000                                                  
      reclassification adjustments to cash flow hedges included in net income, net of tax of 562 and 553, respectively
                                                    860,000                                                  
      amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of 784 and 1,201, respectively
                                                    979,000                                                  
      statement of income:
                                                                                                      
      selling and administrative expenses
                                                     -41,752,250 -56,469,000 -54,854,000 -55,686,000 -54,434,000 -51,529,000 -52,868,000 -51,942,000 -48,881,000 -48,914,000 -48,192,000 -47,952,000 -46,340,000 -47,219,000 -44,653,000 -44,277,000 -43,120,000 -44,258,000 -42,759,000 -43,308,000 -41,344,000 -44,792,000 -43,516,000                           
      corporate overhead
                                                     -14,963,000 -21,143,000 -19,171,000 -19,538,000 -17,494,000 -16,990,000 -17,736,000 -16,888,000 -16,206,000 -16,424,000 -16,352,000 -15,553,000 -14,557,000 -15,527,000 -15,386,000 -12,630,000 -12,504,000 -13,188,000 -15,453,000 -13,435,000 -17,644,000 -15,728,000 -13,983,000                           
      weighted-average common shares outstanding:
                                                                                                      
      basic
                                                     96,579,000 96,758,000 96,432,000 96,415,000 96,384,000 96,360,000 96,266,000 96,598,000 99,281,000 99,020,000 100,094,000 100,741,000 101,678,000 101,776,000 102,035,000 101,928,000 101,577,000 101,713,000 101,469,000 101,362,000 102,753,000 102,562,000 103,100,000    104,567,000 104,166,000 103,599,000 103,672,000 103,421,000 103,355,000 107,334,000 107,672,000 107,418,000 107,019,000 106,358,000 106,602,000 106,157,000 105,845,000 104,628,000 104,303,000 104,419,000  105,053,000     
      diluted
                                                     97,547,000 97,597,000 97,494,000 97,416,000 97,497,000 97,349,000 97,411,000 97,729,000 100,376,000 100,030,000 101,128,000 101,909,000 102,608,000 102,687,000 102,886,000 102,876,000 102,358,000 102,536,000 102,164,000 102,143,000 103,593,000 103,590,000 103,890,000    105,518,000 105,065,000 104,485,000 104,583,000 104,334,000 104,238,000 108,098,000 108,311,000 108,225,000 108,053,000 107,570,000 107,765,000 107,454,000 105,845,000 104,628,000 106,037,000 106,221,000  107,208,000     
      statement of comprehensive income:
                                                                                                      
      reclassification adjustment for cash flow hedges included in net income
                                                     652,250 870,000 870,000 869,000 244,250 -605,000 1,859,000 -277,000                                          
      amortization of pension and postretirement plans actuarial loss and prior service cost
                                                     2,980,250 3,387,000 6,645,000 1,889,000 1,254,000 1,672,000 1,672,000 1,672,000                                          
      unfunded employee benefit obligations
                                                     3,354,500 4,963,000 8,455,000                                               
      fair value adjustments to cash flow hedges
                                                         -2,545,750  -17,701,000 7,518,000                                          
      alternative fuel mixture credits
                                                            95,500,000                                          
      alternative fuel mixture tax credits
                                                                 16,369,000 -111,869,000   41,605,000 47,137,000 79,695,000                               
      benefit for income taxes
                                                             -19,048,000 -22,676,000   -33,912,000 113,565,000                          4,178,000          
      alternative fuel mixture tax credits income
                                                                    9,235,000                                  
      joint venture dividend
                                                                                        2,506,000              
      joint venture dividend, net of expenses
                                                                                     3,508,000  11,526,000               
      other income (expense)
                                                                                           256,000           
      (provision) benefit for income taxes
                                                                                                      
      income before interest and taxes
                                                                                         19,103,000 49,855,000 30,168,000  22,581,000 29,527,000 33,315,000       
      (provision) credit for income taxes
                                                                                             2,304,500 20,730,000        
      basic earnings per common share:
                                                                                                      
      net income per common share
                                                                                              -310 100       
      diluted earnings per common share:
                                                                                                      
    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 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 2002-06-30 2002-03-31 2001-12-31 
                                                                                                        
        assets
                                                                                                        
        current assets:
                                                                                                        
        cash and cash equivalents
      397,100,000 529,000,000 634,000,000 787,900,000 751,700,000 685,000,000 676,600,000 613,600,000 692,400,000 648,000,000 573,200,000 477,100,000 367,700,000 320,000,000 648,700,000 667,300,000 628,600,000 618,700,000 1,702,900,000 972,200,000 983,400,000 974,600,000 949,100,000 853,300,000 764,000,000 679,500,000 738,300,000 569,400,000 442,400,000 361,500,000 293,800,000 199,600,000 102,400,000 216,900,000 370,500,000 321,000,000 254,000,000 239,300,000 279,800,000 213,600,000 162,300,000 184,200,000 186,900,000 163,700,000 126,400,000 124,900,000 154,323,000 161,991,000 185,706,000 190,960,000 396,595,000 370,057,000 268,037,000 207,393,000 140,906,000 515,121,000 84,017,000 156,313,000 40,117,000 119,181,000 173,014,000 196,556,000 172,820,000 181,511,000 197,601,000 260,727,000 224,287,000 192,944,000 140,023,000 149,397,000 147,967,000 297,604,000    208,075,000 147,294,000 161,837,000 118,231,000 94,078,000 67,855,000 112,669,000 184,429,000 165,454,000 180,199,000 213,321,000 119,367,000 91,181,000 87,589,000 172,022,000 116,651,000 131,451,000  131,305,000     
        short-term marketable debt securities and other
      146,600,000                                                                                                  
        accounts receivable
      1,335,900,000 1,255,800,000 1,352,300,000 1,195,100,000 1,164,100,000 1,144,000,000 1,216,100,000 1,145,200,000 1,045,100,000 1,033,200,000 1,045,200,000 1,023,900,000 1,031,400,000 1,031,800,000 1,112,800,000 1,212,000,000 1,140,700,000 1,071,000,000 1,066,700,000 981,400,000 908,600,000 832,400,000 864,600,000 817,300,000 879,500,000 845,600,000 932,300,000 947,000,000 930,300,000 901,900,000 986,200,000 920,000,000 860,200,000 830,700,000 831,300,000 755,200,000 733,300,000 689,200,000 713,200,000 663,400,000 631,400,000 636,500,000 683,500,000 708,000,000 676,700,000 646,100,000 717,947,000 704,218,000 696,344,000 643,083,000 409,725,000 403,367,000 391,683,000 352,142,000 379,675,000 353,527,000 348,272,000 319,988,000 338,516,000 331,249,000 308,816,000 293,159,000 335,000,000 308,665,000 275,727,000 243,403,000 274,026,000 263,448,000 255,321,000 254,898,000 305,894,000 295,343,000                           
        inventories
      1,258,400,000 1,243,200,000 1,277,100,000 1,144,700,000 1,140,600,000 1,124,900,000 1,061,900,000 1,029,500,000 1,003,600,000 1,013,100,000 986,100,000 992,200,000 1,003,400,000 977,300,000 994,900,000 954,200,000 941,200,000 902,500,000 880,100,000 827,200,000 799,600,000 787,900,000 777,600,000 834,500,000 809,900,000 794,100,000 806,300,000 815,700,000 831,700,000 795,600,000 780,600,000 763,700,000 766,400,000 762,500,000 736,600,000 734,400,000 744,500,000 723,600,000 690,600,000 671,300,000 692,500,000 676,800,000 695,900,000 667,500,000 687,600,000 664,900,000 616,962,000 611,342,000 607,306,000 522,523,000 266,892,000 263,008,000 270,181,000 268,767,000 260,772,000 258,620,000 263,283,000 254,675,000 244,375,000 226,521,000 233,916,000 241,142,000 226,731,000 207,867,000 215,631,000 213,396,000 208,736,000 206,886,000 205,453,000 206,954,000 209,154,000 205,042,000    198,730,000 200,438,000 195,946,000 200,637,000 194,339,000 185,981,000 191,828,000 187,645,000 187,261,000 184,487,000 179,348,000 175,870,000 166,247,000 164,017,000 166,312,000 166,480,000 164,553,000  160,549,000     
        prepaid expenses and other current assets
      104,400,000 85,800,000 81,100,000 105,700,000 154,700,000 166,900,000 191,800,000 204,500,000 211,700,000 62,300,000 64,800,000 75,500,000 87,300,000 58,300,000 67,300,000 74,600,000 77,600,000 47,000,000 55,400,000 78,600,000 62,800,000 44,700,000 51,200,000 60,900,000 67,900,000 44,800,000 44,900,000 59,200,000 58,000,000 39,400,000 49,000,000 56,600,000 55,000,000 35,500,000 43,400,000 52,800,000 47,300,000 30,300,000 45,100,000 60,300,000 42,700,000 28,800,000 49,800,000 58,500,000 65,700,000 61,900,000 76,195,000 59,737,000 40,002,000 32,101,000 31,478,000 37,704,000 24,279,000 20,915,000 27,023,000 33,929,000 26,100,000 18,298,000 22,287,000 30,005,000 20,754,000 16,952,000 21,049,000 29,960,000 21,999,000 13,045,000 13,965,000 19,794,000 12,135,000 6,684,000 13,809,000 19,845,000    15,816,000 14,687,000 6,473,000 10,005,000 14,660,000 11,615,000 6,836,000 11,612,000 26,921,000 15,383,000 8,685,000 12,981,000 16,265,000 18,241,000 7,635,000 30,601,000 54,835,000  22,600,000     
        federal and state income taxes receivable
      15,200,000 28,100,000 58,200,000 10,800,000  10,200,000  300,000  4,300,000    35,700,000 6,100,000   7,400,000 11,400,000   5,100,000  6,100,000  26,500,000 9,500,000 11,400,000  16,700,000 5,100,000 16,700,000 48,600,000 69,500,000 20,000,000   13,900,000 18,300,000 1,300,000  28,200,000    5,100,000  2,870,000  22,958,000 9,424,000 4,707,000 36,132,000 65,488,000 82,576,000 85,769,000 94,077,000       22,810,000 9,580,000 4,707,000  9,294,000                               
        total current assets
      3,257,600,000 3,213,700,000 3,497,400,000 3,336,600,000 3,302,500,000 3,233,000,000 3,241,400,000 3,483,900,000 3,445,100,000 3,254,400,000 2,773,300,000 2,670,600,000 2,585,400,000 2,508,300,000 2,907,500,000 2,990,400,000 2,869,400,000 2,732,700,000 3,804,800,000 2,961,100,000 2,856,900,000 2,750,300,000 2,743,700,000 2,659,000,000 2,613,600,000 2,478,400,000 2,531,300,000 2,402,700,000 2,262,400,000 2,115,100,000 2,114,700,000 1,956,600,000 1,832,600,000 1,915,100,000 2,001,800,000 1,863,400,000 1,779,100,000 1,696,300,000 1,747,000,000 1,609,900,000 1,528,900,000 1,554,500,000 1,679,300,000 1,657,400,000 1,614,800,000 1,578,600,000 1,597,707,000 1,574,249,000 1,561,343,000 1,487,204,000 1,135,928,000 1,102,333,000 1,011,636,000 937,033,000 924,833,000 1,285,686,000 865,196,000 812,063,000 669,911,000 742,288,000 772,104,000 798,041,000 813,017,000 860,796,000 873,748,000 885,214,000 847,503,000 766,355,000 615,469,000 633,173,000 700,538,000 833,733,000    728,067,000 648,856,000 646,718,000 631,147,000 588,575,000 521,608,000 553,489,000 641,375,000 644,853,000 660,834,000 677,061,000 557,994,000 504,668,000 482,909,000 567,077,000 570,437,000 554,697,000  509,554,000     
        property, plant, and equipment
      4,995,400,000 4,985,100,000 5,043,300,000 4,115,900,000 4,079,500,000 4,039,000,000 3,982,300,000 3,961,500,000 3,864,500,000  3,863,400,000 3,886,700,000 3,896,600,000  3,813,200,000 3,762,900,000 3,670,700,000  3,360,800,000 3,240,500,000 3,212,500,000  3,130,900,000 3,114,700,000 3,138,600,000  3,110,400,000 3,107,200,000 3,109,800,000  3,065,100,000 3,026,500,000 2,961,400,000  2,881,600,000 2,872,500,000 2,887,200,000 2,895,700,000 2,878,700,000 2,809,900,000 2,817,900,000 2,832,100,000 2,842,500,000 2,852,700,000 2,864,100,000 2,857,600,000 2,818,133,000 2,817,249,000 2,800,742,000 2,805,704,000                                                 
        goodwill
      1,381,700,000 1,372,300,000 1,199,800,000 922,400,000 922,400,000 922,400,000 922,400,000 922,400,000 922,400,000 922,400,000 922,400,000 922,400,000 922,400,000 922,400,000 922,400,000 922,500,000 923,100,000 923,500,000 863,500,000 863,500,000 863,500,000 863,500,000 863,500,000 863,500,000 918,700,000 918,700,000 918,700,000 918,700,000 917,300,000 917,300,000 888,700,000 888,700,000 883,200,000 883,200,000 732,100,000 731,100,000 737,100,000 737,900,000 692,100,000 544,000,000 544,000,000 544,000,000 544,000,000 544,000,000 546,600,000 546,800,000 541,911,000 537,363,000 526,760,000 526,789,000 67,160,000 67,160,000 67,160,000 67,160,000 71,555,000 71,555,000 71,682,000 58,214,000 51,106,000 53,603,000 38,854,000 38,854,000 38,854,000 38,854,000 38,854,000 38,854,000 38,854,000 37,163,000 37,163,000 37,163,000 37,163,000 37,163,000    37,163,000 37,163,000 37,200,000 37,111,000 37,028,000 34,213,000 34,187,000                 
        other intangible assets
      583,900,000 602,300,000 690,600,000 173,100,000 182,500,000 191,900,000 201,300,000 210,700,000 220,100,000 229,600,000 239,200,000 248,700,000 258,300,000 267,900,000 277,400,000 287,300,000 298,200,000 308,400,000 267,700,000 277,000,000 286,300,000 295,900,000 305,400,000 314,900,000 329,200,000 338,800,000 348,500,000 358,200,000 368,700,000 378,200,000 373,900,000 384,100,000 399,600,000 410,000,000                 35,742,000 36,589,000 37,436,000 38,283,000 34,758,000 35,594,000 36,490,000 25,042,000 20,555,000 16,932,000 10,771,000 10,975,000 11,179,000 11,382,000 11,586,000 11,790,000 11,994,000 12,197,000 12,423,000 12,669,000 12,937,000 13,206,000                           
        operating lease right-of-use assets
      377,700,000 376,000,000 369,000,000 314,400,000 306,900,000 276,900,000 260,300,000 266,800,000 269,400,000 279,600,000 279,000,000 286,200,000 288,600,000 298,300,000 286,800,000 273,800,000 264,400,000 238,300,000 230,400,000 233,000,000 231,500,000 234,200,000 231,700,000 229,700,000 235,300,000 234,300,000 232,300,000 238,000,000 217,300,000                                                                      
        long-term marketable debt securities
      71,800,000 67,000,000 77,700,000 75,600,000 71,300,000 65,200,000 69,700,000 68,400,000 68,500,000 64,100,000 49,300,000 50,600,000 56,900,000 64,900,000 67,100,000 61,200,000 68,500,000 60,000,000 57,800,000 49,900,000 47,000,000 42,700,000 45,200,000 36,300,000 57,100,000 58,100,000                                                                         
        other long-term assets
      109,800,000 109,100,000 102,200,000 103,200,000 104,700,000 104,800,000 76,400,000 68,400,000 67,000,000 67,200,000 51,000,000 41,300,000 40,800,000 42,000,000 70,000,000 42,500,000 43,500,000 44,900,000 45,800,000 48,600,000 51,300,000 53,200,000 52,200,000 53,900,000 55,100,000 55,800,000 49,900,000 49,600,000 53,100,000 50,500,000 57,600,000 59,700,000 63,000,000 64,300,000 63,900,000 80,000,000 81,200,000 80,000,000 74,600,000 72,800,000 71,400,000 83,200,000 80,000,000 73,700,000 72,100,000 72,000,000 73,902,000 69,374,000 70,212,000 69,738,000 49,226,000 45,058,000 46,504,000 45,223,000 47,547,000 44,926,000 41,861,000 40,526,000 50,515,000 44,842,000 39,078,000 38,418,000 35,427,000 35,560,000 35,627,000 34,478,000 35,557,000 35,662,000 36,326,000 35,717,000 38,347,000 38,420,000    35,740,000 36,185,000 36,056,000 35,979,000 36,350,000 36,450,000 35,585,000 36,426,000 38,232,000 39,270,000 38,451,000 37,044,000 39,143,000 38,918,000 39,731,000 41,054,000 56,492,000  60,163,000     
        total assets
      10,777,900,000 10,725,500,000 10,980,000,000 9,041,200,000 8,969,800,000 8,833,200,000 8,753,800,000 8,982,100,000 8,857,000,000 8,681,100,000 8,177,600,000 8,106,500,000 8,049,000,000 8,003,800,000 8,344,400,000 8,340,600,000 8,137,800,000 7,836,800,000 8,630,800,000 7,673,600,000 7,549,000,000 7,433,200,000 7,372,600,000 7,272,000,000 7,347,600,000 7,235,800,000 7,191,100,000 7,074,400,000 6,928,600,000 6,569,700,000 6,500,000,000 6,315,600,000 6,139,800,000 6,197,500,000 6,027,200,000 5,903,200,000 5,843,400,000 5,777,000,000 5,747,200,000 5,296,100,000 5,227,300,000 5,284,600,000 5,422,200,000 5,409,900,000 5,385,400,000 5,348,500,000 5,330,749,000 5,304,237,000 5,263,948,000 5,199,974,000 2,657,109,000 2,614,821,000 2,515,938,000 2,453,768,000 2,455,150,000 2,831,491,000 2,492,359,000 2,412,499,000 2,232,743,000 2,259,181,000 2,220,947,000 2,224,274,000 2,190,032,000 2,203,519,000 2,164,295,000 2,152,840,000 2,111,501,000 2,046,362,000 1,912,162,000 1,939,741,000 1,989,430,000 2,127,536,000    2,034,883,000 1,972,702,000 1,986,976,000 1,992,392,000 1,976,190,000 1,921,224,000 1,973,298,000 2,070,703,000 2,085,444,000 2,066,717,000 2,082,774,000 1,968,859,000 1,935,161,000 1,926,228,000 1,985,126,000 1,991,586,000 2,003,695,000  1,982,551,000     
        liabilities and stockholders' equity
                                                                                                        
        current liabilities:
                                                                                                        
        operating lease obligations
      102,000,000 99,800,000 96,000,000 86,700,000 84,100,000 80,500,000 81,700,000 80,300,000 79,200,000 78,600,000 77,100,000 75,000,000 72,700,000 72,200,000 72,500,000 69,300,000 69,700,000 67,100,000 67,200,000 68,800,000 69,300,000 68,900,000 68,000,000 67,100,000 64,300,000 62,600,000 60,400,000 59,900,000 57,200,000                                                                      
        finance lease obligations
      2,400,000 2,300,000 2,200,000 2,200,000 2,200,000 2,100,000 2,100,000 2,100,000 2,000,000 2,000,000 2,000,000 1,900,000 1,900,000 1,900,000 1,800,000 1,800,000 1,800,000 1,700,000 1,700,000 1,700,000 1,700,000 1,600,000 1,600,000 1,600,000 1,600,000 1,500,000 1,500,000 1,500,000 1,500,000                                                                      
        accounts payable
      557,000,000 471,400,000 554,200,000 490,700,000 480,900,000 430,300,000 459,900,000 474,500,000 449,600,000 402,400,000 405,900,000 365,800,000 410,500,000 410,400,000 485,300,000 528,200,000 546,700,000 452,400,000 499,100,000 405,300,000 402,500,000 387,000,000 352,100,000 315,200,000 389,000,000 351,900,000 385,500,000 382,800,000 405,100,000 382,200,000 438,900,000 431,700,000 427,300,000 402,900,000 379,500,000 349,200,000 367,300,000 323,800,000 327,000,000 308,400,000 309,000,000 294,200,000 337,000,000 339,300,000 352,700,000 330,500,000 387,854,000 394,743,000 390,630,000 357,432,000 163,928,000 164,910,000 142,856,000 117,510,000 147,308,000 134,113,000 153,028,000 154,855,000 176,677,000 189,778,000 167,822,000 154,130,000 169,944,000 165,835,000 158,270,000 126,813,000 116,734,000 121,447,000 116,761,000 101,064,000 138,315,000 133,293,000    133,755,000 125,934,000 119,397,000 126,883,000 131,466,000 116,490,000 124,851,000 142,198,000 140,460,000 147,368,000 128,953,000 116,975,000 114,239,000 123,964,000 126,924,000 97,064,000 91,405,000  85,807,000     
        dividends payable
      113,100,000 116,100,000 116,200,000 115,800,000 116,000,000 116,300,000 115,800,000 115,400,000 114,900,000 115,900,000 115,400,000 115,400,000 115,700,000 115,500,000 118,800,000 120,200,000 96,900,000 96,300,000 97,300,000 97,400,000 97,600,000 97,000,000 76,700,000 76,500,000 77,000,000 76,600,000 76,300,000 75,900,000 76,200,000 76,100,000 75,800,000 75,500,000 60,600,000 60,500,000 60,300,000 60,100,000 60,000,000 59,900,000 59,800,000 52,100,000 52,100,000 53,400,000 53,700,000 53,900,000 54,100,000 39,400,000 39,393,000 39,359,000 39,351,000 39,297,000 39,261,000 39,226,000 30,669,000  24,578,000 24,480,000 24,631,000 19,680,000 19,990,000 20,258,000 20,477,000 15,351,000 15,432,000 15,455,000 15,460,000 15,451,000 15,442,000 15,377,000 15,360,000 30,719,000 31,097,000 31,157,000    26,314,000 26,243,000 26,154,000 26,107,000 25,954,000 25,946,000 27,045,000                 
        accrued liabilities
      238,300,000 302,100,000 298,400,000 238,200,000 262,500,000 362,900,000 393,300,000 345,600,000 304,000,000 253,500,000 245,100,000 219,900,000 184,700,000 263,700,000 259,500,000 236,700,000 188,600,000 255,000,000 252,500,000 231,400,000 184,000,000 216,200,000 231,600,000 211,300,000 178,800,000 217,500,000 220,100,000 197,900,000 160,900,000 222,400,000 223,400,000 195,700,000 157,000,000 203,200,000 207,800,000 177,500,000 147,100,000 201,200,000 204,900,000 170,200,000 144,400,000 193,500,000 209,000,000 189,400,000 164,000,000 220,000,000 228,758,000 207,314,000 180,869,000 214,058,000 129,569,000 120,335,000 91,718,000 122,696,000 114,750,000 102,983,000 122,778,000 163,259,000 110,790,000 93,468,000 77,952,000 111,208,000 111,079,000 93,488,000 81,613,000 106,423,000 112,175,000 91,000 75,265,000 106,588,000 110,043,000 95,293,000    89,912,000 71,524,000 100,430,000 93,633,000 77,332,000 69,839,000 89,394,000 93,336,000 80,875,000 66,670,000 84,392,000 88,433,000 72,181,000 72,953,000 89,779,000 88,793,000 72,850,000  84,543,000     
        accrued interest
      48,100,000 23,400,000 40,500,000 9,400,000 32,500,000 9,500,000 32,500,000 13,700,000 33,300,000 13,700,000 25,500,000 11,700,000 25,500,000 11,800,000 25,500,000 11,700,000 26,000,000 12,300,000 28,500,000 11,600,000 28,100,000 11,900,000 28,100,000 11,900,000 30,200,000 13,700,000 26,900,000 11,600,000 27,100,000 11,500,000 27,000,000 11,500,000 27,300,000 14,800,000 18,900,000 13,100,000 19,000,000 13,400,000 18,800,000 13,100,000 18,800,000 13,100,000 18,800,000 13,100,000 18,800,000 13,500,000 19,272,000 8,932,000 19,063,000 9,722,000 5,131,000 3,682,000 5,157,000 3,676,000 4,672,000 12,782,000 4,391,000 12,584,000 4,353,000 12,537,000 4,359,000 12,598,000 4,405,000 12,601,000 4,455,000 12,644,000 4,457,000 12,657,000 4,380,000 12,723,000 4,378,000 15,164,000    12,847,000 5,467,000 12,870,000 5,469,000 12,833,000 5,415,000 12,774,000 5,312,000 12,662,000 5,243,000 12,591,000 5,022,000 12,572,000 5,046,000 13,511,000 6,195,000 13,370,000  13,362,000     
        total current liabilities
      1,060,900,000 1,015,100,000 1,107,500,000 943,000,000 1,007,700,000 1,001,600,000 1,100,500,000 1,431,500,000 1,400,300,000 1,265,700,000 1,278,900,000 797,700,000 828,900,000 875,500,000 963,400,000 972,900,000 967,900,000 884,800,000 1,644,400,000 816,800,000 805,800,000 782,600,000 775,400,000 683,600,000 744,600,000 723,800,000 770,700,000 729,600,000 740,700,000 693,600,000 766,500,000 715,800,000 673,600,000 832,700,000 824,300,000 760,200,000 776,000,000 625,400,000 637,500,000 551,500,000 545,300,000 561,900,000 628,400,000 606,200,000 621,300,000 611,000,000 690,035,000 657,913,000 643,433,000 660,539,000 353,902,000 344,150,000 286,380,000 259,846,000 307,257,000 689,948,000 320,746,000 376,500,000 421,980,000 425,735,000 387,311,000 405,558,000 426,063,000 397,027,000 369,434,000 370,957,000 368,307,000 351,011,000 336,472,000 361,982,000 406,518,000 548,289,000    400,850,000 361,707,000 388,338,000 396,109,000 385,729,000 335,720,000 372,094,000 358,876,000 343,027,000 328,381,000 335,104,000 319,529,000 308,091,000 311,062,000 342,977 301,122,000 286,695,000  296,806,000     
        long-term liabilities:
                                                                                                        
        long-term debt
      3,968,100,000 3,967,300,000 3,966,400,000 2,475,200,000 2,474,700,000 2,474,200,000 2,473,700,000 2,473,200,000 2,472,700,000 2,472,200,000 2,075,700,000 2,474,700,000 2,474,100,000 2,473,600,000 2,473,100,000 2,472,600,000 2,472,000,000 2,471,500,000 2,471,100,000 2,479,800,000 2,480,000,000 2,479,400,000 2,478,700,000 2,478,000,000 2,477,400,000 2,476,800,000 2,486,300,000 2,485,400,000 2,484,600,000 2,483,700,000 2,482,900,000 2,482,100,000 2,481,200,000 2,480,400,000 2,456,300,000 2,457,300,000 2,458,400,000 2,620,000,000 2,625,800,000 2,288,100,000 2,289,300,000 2,302,700,000 2,319,300,000 2,345,800,000 2,347,400,000 2,348,900,000 2,350,484,000 2,425,441,000 2,475,393,000 2,508,845,000 767,411,000 771,151,000 774,890,000 778,630,000 782,370,000 786,110,000 789,785,000 793,448,000 549,361,000 549,273,000 549,186,000 549,099,000 549,011,000 548,924,000 548,836,000 548,749,000 548,662,000 548,575,000 548,487,000 548,400,000 548,313,000 548,226,000    567,932,000 567,851,000 567,770,000 567,686,000 577,606,000 577,285,000 577,173,000 577,061,000 585,948,000 585,836,000 585,724,000 585,612,000 585,569,000 585,457,000 585,198,000 599,695,000 629,140,000  629,119,000     
        deferred income taxes
      677,600,000 660,100,000 671,800,000 564,900,000 570,800,000 561,900,000 540,500,000 552,100,000 566,500,000 558,000,000 536,800,000 538,600,000 546,200,000 543,000,000 513,700,000 495,100,000 488,800,000 465,900,000 423,900,000 395,700,000 392,600,000 379,400,000 363,700,000 361,100,000 354,300,000 340,100,000 327,600,000 314,800,000 305,700,000 285,200,000 279,300,000 272,800,000 256,700,000 239,500,000 342,100,000 342,700,000 349,300,000 334,700,000 360,900,000 353,900,000 357,200,000 347,000,000 63,200,000 59,700,000 58,400,000 75,700,000 32,280,000 34,091,000 31,985,000 75,579,000 21,814,000 23,490,000 21,324,000 22,328,000 33,881,000 38,720,000 49,447,000 62,789,000 24,616,000 31,745,000 35,604,000 50,232,000 57,417,000 13,944,000 16,166,000 22,125,000 20,108,000 11,534,000 2,537,000 15,240,000 23,714,000 15,899,000    16,326,000 11,145,000 19,303,000 24,615,000 21,796,000 22,989,000 28,975,000 29,753,000 29,385,000 53,361,000 59,113,000 23,708,000 24,083,000 24,196,000 29,703,000 54,240,000 10,105,000  19,384,000     
        compensation and benefits
      107,900,000 106,200,000 101,900,000 98,100,000 94,400,000 95,900,000 98,500,000 114,900,000 112,100,000 106,400,000 116,400,000 153,500,000 148,500,000 141,800,000 129,200,000 153,200,000 157,000,000 157,400,000 241,100,000 294,300,000 295,800,000 298,300,000 300,700,000 369,500,000 372,300,000 375,500,000 320,300,000 364,900,000 363,500,000 357,500,000 360,200,000 374,900,000 373,000,000 372,500,000 322,800,000 356,300,000 355,200,000 357,200,000 312,200,000 357,400,000 363,000,000 358,600,000    361,700,000    193,548,000                                                 
        other long-term liabilities
      81,200,000 83,300,000 84,600,000 81,200,000 81,500,000 80,900,000 80,400,000 79,000,000 65,400,000 60,700,000 60,300,000 61,700,000 58,200,000 57,400,000 61,100,000 59,700,000 58,000,000 58,000,000 57,400,000 56,900,000 59,600,000 59,200,000 61,700,000 60,000,000 56,300,000 55,000,000 57,800,000 58,300,000 56,900,000 59,700,000 63,000,000 63,700,000 62,900,000 70,800,000 68,200,000 60,400,000 59,800,000 59,600,000 60,100,000 61,900,000 60,400,000 59,500,000 58,000,000 70,000,000 70,200,000 72,800,000 84,764,000 83,084,000 80,810,000 65,318,000 33,661,000 29,951,000 31,200,000 29,229,000 28,815,000 28,393,000 27,942,000 29,866,000 69,545,000 28,462,000 30,163,000 29,629,000 56,795,000 39,332,000 27,944,000 27,700,000 29,357,000 28,519,000 27,926,000 27,438,000 27,124,000 26,407,000                           
        total long-term liabilities
      5,129,200,000 5,112,400,000 5,117,000,000 3,466,100,000 3,462,900,000 3,427,600,000 3,389,700,000 3,424,000,000 3,425,700,000 3,418,100,000 3,011,500,000 3,460,200,000 3,462,400,000 3,461,200,000 3,409,800,000 3,403,200,000 3,390,600,000 3,344,800,000 3,378,100,000 3,412,500,000 3,412,000,000 3,404,300,000 3,391,800,000 3,455,300,000 3,453,100,000 3,441,000,000 3,385,700,000 3,423,600,000 3,393,300,000 3,203,700,000 3,203,300,000 3,211,800,000 3,192,400,000 3,182,200,000 3,208,700,000 3,236,400,000 3,242,700,000 3,391,800,000 3,379,700,000 3,082,300,000 3,091,200,000 3,089,400,000 3,178,800,000 3,212,700,000 3,207,800,000 3,216,100,000 3,088,675,000 3,163,705,000 3,202,932,000 3,226,420,000 1,204,079,000 1,219,385,000 1,227,739,000 1,224,461,000 1,207,797,000 1,218,823,000 1,249,669,000 1,107,089,000 837,212,000 812,241,000 813,140,000 809,715,000 797,657,000 885,339,000 889,204,000 883,038,000 890,878,000 901,641,000 879,771,000 893,810,000 849,942,000 855,384,000    895,733,000 901,357,000 906,867,000 897,525,000 915,874,000 918,766,000 919,784,000 912,999,000 928,875,000 929,450,000 930,100,000 852,531,000 845,500,000 834,416,000 844,669,000 887,208,000 904,869,000  889,870,000     
        commitments and contingent liabilities
                                                                                                        
        stockholders' equity:
                                                                                                        
        common stock, par value 0.01 per share...
      900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 1,000,000 1,000,000 1,000,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 900,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 984,000 984,000 983,000 982,000 981,000 983,000 981,000 981,000 981,000 981,000 980,000  996,000 1,016,000 1,020,000  1,027,000 1,035,000                                   
        additional paid in capital
      721,500,000 707,700,000 707,700,000 699,100,000 687,800,000 669,800,000 660,600,000 650,300,000 640,500,000 620,100,000 612,500,000 607,400,000 597,800,000 581,800,000 600,600,000 601,000,000 591,700,000 579,400,000 581,300,000 574,500,000 566,000,000 554,400,000 548,700,000 542,700,000 534,900,000 524,800,000 518,900,000 513,300,000 501,400,000 494,500,000 488,900,000 482,100,000 476,300,000 471,200,000 466,100,000 460,900,000 456,000,000 451,400,000 446,000,000 441,100,000 432,800,000 439,900,000 438,100,000 441,900,000 436,000,000 432,100,000 427,844,000 423,598,000 412,142,000 401,761,000 396,557,000 392,178,000 382,395,000 378,794,000 370,905,000 363,174,000 361,136,000 351,804,000 356,664,000 331,301,000 350,446,000 362,248,000 370,193,000 391,634,000 390,948,000 387,496,000 385,353,000 384,363,000 380,483,000 379,104,000 398,047,000 395,925,000    446,701,000 437,639,000 429,508,000 425,291,000 417,994,000 415,665,000 418,621,000 510,367,000 508,452,000 499,233,000 492,661,000 491,490,000 485,371,000 479,888,000 473,097,000 462,437,000 459,304,000  466,911,000     
        retained earnings
      3,906,400,000 3,931,000,000 4,087,300,000 3,973,500,000 3,852,800,000 3,776,700,000 3,669,100,000 3,544,400,000 3,459,600,000 3,447,200,000 3,370,500,000 3,339,000,000 3,259,300,000 3,186,800,000 3,443,500,000 3,437,000,000 3,261,900,000 3,102,100,000 3,162,800,000 3,008,500,000 2,906,300,000 2,835,500,000 2,806,700,000 2,742,900,000 2,771,100,000 2,704,800,000 2,643,700,000 2,539,200,000 2,427,800,000 2,315,800,000 2,185,500,000 2,054,000,000 1,949,600,000 1,867,400,000 1,658,200,000 1,578,800,000 1,504,500,000 1,447,100,000 1,396,900,000 1,337,200,000 1,286,500,000 1,317,300,000 1,317,900,000 1,293,100,000 1,271,600,000 1,242,200,000 1,184,155,000 1,119,367,000 1,067,661,000 975,296,000 787,684,000 753,439,000 729,727,000 703,728,000 670,178,000 661,600,000 648,693,000 673,960,000 678,011,000 726,208,000 707,059,000 690,111,000 650,565,000 572,672,000 550,092,000 546,355,000 503,118,000 445,899,000 352,392,000 342,072,000 345,921,000 338,908,000    299,273,000 279,353,000 269,296,000 255,390,000 237,743,000 231,449,000 248,404,000 273,789,000 290,250,000 289,431,000 303,662,000 283,443,000 273,805,000 276,123,000 298,869,000 314,530,000 346,866,000  329,065,000     
        accumulated other comprehensive loss
      -41,000,000 -41,600,000 -40,400,000 -41,400,000 -42,300,000 -43,400,000 -67,000,000 -69,000,000 -70,000,000 -70,900,000 -96,700,000 -98,700,000 -100,300,000 -102,400,000 -73,800,000 -74,400,000 -75,200,000 -75,200,000 -136,800,000 -139,700,000 -142,100,000 -144,500,000 -150,900,000 -153,400,000 -157,000,000 -159,500,000 -128,800,000 -132,200,000 -135,500,000 -138,800,000 -145,100,000 -149,000,000 -153,000,000 -156,900,000 -131,000,000 -134,000,000 -136,700,000 -139,600,000 -114,200,000 -116,900,000 -122,400,000 -124,900,000 -142,000,000 -145,000,000 -152,300,000 -153,900,000 -60,944,000 -61,330,000 -63,203,000 -65,024,000                                                 
        total stockholders' equity
      4,587,800,000 4,598,000,000 4,755,500,000 4,632,100,000 4,499,200,000 4,404,000,000 4,263,600,000 4,126,600,000 4,031,000,000 3,997,300,000 3,887,200,000 3,848,600,000 3,757,700,000 3,667,100,000 3,971,200,000 3,964,500,000 3,779,300,000 3,607,200,000 3,608,300,000 3,444,300,000 3,331,200,000 3,246,300,000 3,205,400,000 3,133,100,000 3,149,900,000 3,071,000,000 3,034,700,000 2,921,200,000 2,794,600,000 2,672,400,000 2,530,200,000 2,388,000,000 2,273,800,000 2,182,600,000 1,994,200,000 1,906,600,000 1,824,700,000 1,759,800,000 1,729,600,000 1,662,300,000 1,590,800,000 1,633,300,000 1,615,000,000 1,591,000,000 1,556,300,000 1,521,400,000 1,552,039,000 1,482,619,000 1,417,583,000 1,313,015,000                                                 
        total liabilities and stockholders' equity
      10,777,900,000 10,725,500,000 10,980,000,000 9,041,200,000 8,969,800,000 8,833,200,000 8,753,800,000 8,982,100,000 8,857,000,000 8,681,100,000 8,177,600,000 8,106,500,000 8,049,000,000 8,003,800,000 8,344,400,000 8,340,600,000 8,137,800,000 7,836,800,000 8,630,800,000 7,673,600,000 7,549,000,000 7,433,200,000 7,372,600,000 7,272,000,000 7,347,600,000 7,235,800,000 7,191,100,000 7,074,400,000 6,928,600,000 6,569,700,000 6,500,000,000 6,315,600,000 6,139,800,000 6,197,500,000 6,027,200,000 5,903,200,000 5,843,400,000 5,777,000,000  5,296,100,000 5,227,300,000 5,284,600,000 5,422,200,000 5,409,900,000 5,385,400,000 5,348,500,000 5,330,749,000 5,304,237,000 5,263,948,000 5,199,974,000                                                 
        short-term marketable debt securities
       71,800,000 94,700,000 92,400,000 91,400,000 102,000,000 95,000,000 490,800,000 492,300,000 493,500,000 104,000,000 101,900,000 95,600,000 85,200,000 77,700,000 82,300,000 81,300,000 86,100,000 88,300,000 101,700,000 102,500,000 105,600,000 101,200,000 86,900,000 92,300,000 87,900,000                                                                         
        federal and state income taxes payable
          29,500,000  15,200,000  17,500,000  8,400,000 8,000,000 17,900,000   5,000,000 38,200,000   600,000 22,600,000  17,300,000  3,700,000    12,700,000       2,500,000 24,800,000    13,300,000  2,300,000 2,900,000 24,100,000  7,176,000  5,973,000         10,404,000 464,000  7,019,000 2,601,000                                     
        current maturities of long-term debt
             399,900,000 399,800,000 399,600,000 399,500,000        698,100,000               150,000,000 156,500,000 156,500,000 156,500,000 25,800,000 25,800,000 6,500,000 6,500,000 6,500,000 6,500,000 6,500,000 6,500,000 6,500,000 6,500,000 6,500,000 6,500,000 39,000,000 15,000,000 15,000,000 15,000,000 15,000,000 15,000,000 414,657,000 15,000,000                                          
        property, plant and equipment
               3,863,800,000    3,900,000,000    3,529,000,000    3,193,400,000    3,151,700,000    3,108,600,000    2,924,900,000                 1,369,053,000 1,363,681,000 1,353,202,000 1,366,069,000 1,376,457,000 1,393,730,000 1,477,130,000 1,476,654,000 1,434,362,000 1,401,516,000 1,360,140,000 1,337,986,000 1,291,555,000 1,256,927,000 1,204,480,000 1,182,504,000 1,177,593,000 1,194,985,000 1,210,781,000 1,221,019,000 1,200,445,000 1,205,014,000    1,219,606,000 1,235,915,000 1,252,291,000 1,259,225,000 1,284,873,000 1,299,711,000 1,320,511,000 1,338,914,000 1,348,191,000 1,344,686,000 1,345,154,000 1,353,416,000 1,371,557,000 1,384,409,000 1,372,823,000 1,376,331,000 1,388,712,000  1,408,980,000     
        capital lease obligations
                                   1,400,000 1,400,000 1,400,000 1,400,000 1,300,000 1,300,000 1,300,000 1,300,000 1,300,000 1,200,000 1,200,000 1,200,000 1,200,000 1,100,000 1,100,000 1,100,000 1,100,000 1,082,000 1,065,000 1,047,000 1,030,000 1,013,000 997,000 980,000 964,000 949,000 933,000 918,000 718,000 706,000 694,000 682,000 670,000 659,000 648,000 636,000 626,000 615,000 604,000 594,000 606,000                             
        intangible assets
                                        347,800,000 356,200,000 358,800,000 367,100,000 354,800,000 259,500,000 265,100,000 270,800,000 276,400,000 282,100,000 287,800,000 293,500,000 299,096,000 306,002,000 304,891,000 310,539,000                                                 
        liabilities and equity
                                                                                                        
        noncontrolling interests
                                            400,000                                                            
        total equity
                                            1,730,000,000                                                            
        total liabilities and equity
                                            5,747,200,000                                                            
        common stock held in treasury, at cost, 0.1 million shares as of march 31, 2016
                                              -7,000,000                                                          
        pension and postretirement benefit plans
                                                376,900,000 372,000,000 367,800,000  204,286,000 200,900,000 199,150,000  132,486,000 163,969,000 171,163,000 164,538,000 134,049,000 151,819,000 153,428,000 148,686,000 94,957,000 101,988,000 100,904,000 97,914,000 82,894,000 84,154,000 83,881,000 78,859,000 79,489,000 89,666,000 89,013,000  36,671,000 41,916,000    65,719,000 66,218,000 65,914,000                     
        alternative energy tax credits reserve
                                                                                                        
        liabilities and stockholders’ equity
                                                                                                        
        cellulosic biofuel tax reserve
                                                        102,051,000 102,051,000 102,051,000 102,051,000 102,051,000 102,051,000 102,051,000 102,051,000 102,051,000 102,051,000 102,051,000 102,051,000                                     
        stockholders’ equity:
                                                                                                        
        accumulated other comprehensive loss, net of tax:
                                                                                                        
        unrealized loss on treasury locks
                                                        -29,057,000 -29,922,000 -30,787,000 -31,651,000 -32,510,000 -31,900,000 -16,053,000                                          
        unrealized loss on foreign currency exchange contracts
                                                        -377,000 -382,000 -387,000  -398,000 -403,000 -408,000  -419,000 -405,000 -444,000  -555,000 -925,000 -811,000                                  
        unfunded employee benefit obligations
                                                        -56,660,000 -65,010,000 -80,110,000 -81,999,000 -69,060,000 -70,732,000 -72,404,000 -74,076,000 -43,085,000 -44,036,000 -44,987,000 -45,938,000 -37,865,000 -38,759,000 -39,653,000 -40,548,000 -42,158,000 -43,016,000 -43,876,000 -44,609,000 -18,841,000 -19,332,000                           
        total accumulated other comprehensive loss
                                                        -86,094,000 -95,314,000 -111,284,000 -114,042,000 -101,968,000 -103,035,000 -88,865,000 -97,778,000 -62,120,000 -37,320,000 -38,029,000 -44,381,000 -54,307,000 -44,188,000 -36,414,000 -36,036,000 -37,185,000 -37,581,000 -37,980,000                              
        total stockholders’ equity
                                                        1,099,128,000 1,051,286,000 1,001,819,000 969,461,000 940,096,000 922,720,000 921,944,000 928,910,000 973,551,000 1,021,205,000 1,020,496,000 1,009,001,000 966,312,000 921,153,000 905,657,000 898,845,000 852,316,000 793,710,000 695,919,000 683,949,000 732,970,000 723,863,000    738,300,000 709,638,000 691,771,000                     
        total liabilities and stockholders’ equity
                                                        2,657,109,000 2,614,821,000 2,515,938,000 2,453,768,000 2,455,150,000 2,831,491,000 2,492,359,000 2,412,499,000 2,232,743,000 2,259,181,000 2,220,947,000 2,224,274,000 2,190,032,000 2,203,519,000 2,164,295,000 2,152,840,000 2,111,501,000 2,046,362,000 1,912,162,000 1,939,741,000 1,989,430,000 2,127,536,000    2,034,883,000 1,972,702,000 1,986,976,000                     
        unrealized loss on foreign exchange contracts
                                                           -392,000    -413,000    -607,000                                     
        common stock held in treasury, at cost
                                                               -59,000     -1,166,000        -12,000                     -3,364,000       
        accumulated other comprehensive income, net of tax:
                                                                                                        
        short-term debt and current maturities of long-term debt
                                                               15,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,000,000 109,055,000 259,087,000    119,152,000 119,150,000 119,147,000 119,146,000 118,142,000 118,030,000 118,030,000 118,030,000 109,030,000 109,100,000 109,168,000 109,099,000 109,099,000 109,099,000 112,763,000 109,070,000 109,070,000  113,094,000     
        common stock
                                                               983,000    1,023,000   1,031,000 1,030,000 1,030,000 1,029,000 1,024,000 1,024,000 1,035,000 1,035,000    1,055,000 1,050,000 1,046,000 1,045,000 1,041,000 1,038,000 1,037,000 1,081,000 1,080,000 1,074,000 1,070,000 1,069,000 1,064,000 1,062,000 1,056,000 1,047,000 1,043,000  1,045,000     
        unrealized gain on treasury locks
                                                               -23,289,000 -18,616,000 7,121,000 7,402,000 2,164,000 -15,887,000 -4,504,000                                   
        federal and state income tax receivable
                                                                 3,587,000                                       
        alternative fuel mixture tax credits receivable
                                                                     96,039,000 137,044,000 127,811,000 106,381,000 62,455,000                               
        accrued federal and state income taxes
                                                                    15,544,000    9,884,000  15,112,000 1,282,000 13,630,000 14,295,000    18,870,000 13,389,000 10,340,000 24,871,000 20,002,000                   
        accumulated other comprehensive income:
                                                                                                        
        unrealized gain on treasury lock
                                                                      4,050,000 4,512,000 4,973,000 5,435,000 5,896,000 6,358,000 6,820,000 7,327,000    14,705,000 15,482,000 16,259,000         23,252,000            
        pension and postretirement benefits
                                                                           85,964,000                             
        cumulative foreign currency translation adjustments
                                                                                                        
        total accumulated other comprehensive income
                                                                           -38,251,000 -12,021,000 -12,005,000       17,032,000 17,809,000 18,586,000 19,363,000 20,140,000 20,917,000 21,693,000 22,469,000 23,280,000 24,058,000 24,834,000 25,607,000 26,352,000 9,466,000       
        cumulative foreign currency translation adjustment
                                                                                        -4,000    28,000 28,000 28,000 23,000 -9,000 -4,000       
        other intangible assets, net of accumulated amortization of 5,703 and 4,872 as of september 30, 2007 and december 31, 2006, respectively
                                                                                                        
        accounts and notes receivable
                                                                                 289,120,000 275,292,000 263,159,000 277,659,000 263,702,000 233,168,000 213,181,000 227,936,000 235,832,000 227,404,000 216,594,000 226,068,000 206,892,000 188,866,000 191,405,000 202,465,000 193,753,000  175,716,000     
        other intangible assets, net of accumulated amortization of 5,426 and 4,872 as of june 30, 2007 and december 31, 2006, respectively
                                                                                 14,307,000                       
        other liabilities
                                                                                 22,052,000 22,073,000 12,215,000 50,904,000 54,757,000 53,023,000 49,901,000 38,501,000 43,683,000 41,639,000 37,807,000 32,241,000 33,568,000 30,695,000 28,522,000 19,988,000 19,569,000  19,379,000     
        other intangible assets, net of accumulated amortization of 5,150 and 4,872 as of march 31, 2007 and december 31, 2006, respectively
                                                                                  14,583,000                      
        other intangible assets, net of accumulated amortization of 4,872 and 3,837 as of december 31, 2006 and 2005, respectively
                                                                                   14,711,000                     
        unearned compensation on restricted stock
                                                                                        -6,549,000    -2,483,000    -1,110,000 -1,184,000       
        other intangible assets, net of accumulated amortization of 4,614 and 3,837 as of september 30, 2006 and december 31, 2005, respectively
                                                                                    28,930,000                    
        liabilities and shareholders’ equity
                                                                                                        
        shareholders’ equity:
                                                                                                        
        unrealized gain on derivatives
                                                                                    17,036,000 17,813,000 18,590,000 19,367,000 20,144,000 20,921,000 21,699,000 22,475,000  24,030,000 24,806,000 25,584,000 26,361,000 9,470,000       
        total shareholders’ equity
                                                                                    698,758,000 674,587,000 666,738,000 681,420,000 798,828,000 813,542,000 808,886,000 817,570,000 796,799,000 781,570,000 780,750,000 797,480,000 803,256,000 812,131,000  795,875,000     
        total liabilities and shareholders’ equity
                                                                                    1,992,392,000 1,976,190,000 1,921,224,000 1,973,298,000 2,070,703,000 2,085,444,000 2,066,717,000 2,082,774,000 1,968,859,000 1,935,161,000 1,926,228,000 1,985,126,000 1,991,586,000 2,003,695,000  1,982,551,000     
        other intangible assets, net of accumulated amortization of 4,399 and 3,837 as of june 30, 2006 and december 31, 2005, respectively
                                                                                     29,364,000                   
        other intangible assets, net of accumulated amortization of 4,121 and 3,837 as of march 31, 2006 and december 31, 2005, respectively
                                                                                      29,242,000                  
        other intangible assets, net of accumulated amortization of 3,837 and 2,840 as of december 31, 2005 and 2004, respectively
                                                                                       29,526,000                 
        goodwill and other intangible assets, net of accumulated amortization of 3,380 and 2,840 as of september 30, 2005 and december 31, 2004, respectively
                                                                                        53,988,000                
        goodwill and other intangible assets, net of accumulated amortization of 3,200 and 2,840 as of june 30, 2005 and december 31, 2004, respectively
                                                                                         54,168,000               
        intangible assets, net of accumulated amortization of 3,021 and 2,840 as of march 31, 2005 and december 31, 2004, respectively
                                                                                          21,927,000              
        intangible assets, net of accumulated amortization of 2,840 and 2,079 as of december 31, 2004 and 2003, respectively
                                                                                           22,108,000             
        goodwill and other intangible assets, net of accumulated amortization of 2,507 and 2,079 as of september 30, 2004 and december 31, 2003, respectively
                                                                                            20,405,000            
        goodwill and other intangible assets, net of accumulated amortization of 2,407 and 2,079 as of june 30, 2004 and december 31, 2003, respectively
                                                                                             19,793,000           
        goodwill and other intangible assets, net of accumulated amortization of 2,361 and 2,079 as of march 31, 2004 and december 31, 2003, respectively
                                                                                              19,992,000          
        intangible assets, net of accumulated amortization of 2,079 and 1,726 as of december 31, 2003 and 2002, respectively
                                                                                               5,495,000         
        intangible assets, net of accumulated amortization of 1,991 and 1,726 as of september 30, 2003 and december 31, 2002, respectively
                                                                                                3,764,000        
        intangible assets, net of accumulated amortization of 1,903 and 1,726 as of june 30, 2003 and december 31, 2002, respectively
                                                                                                 3,794,000       
        intangible assets, net of accumulated amortization of 1,814 and 1,726 as of march 31, 2003 and december 31, 2002, respectively
                                                                                                        
        liabilities and shareholders' equity
                                                                                                        
        shareholders' equity:
                                                                                                        
        intangible assets, net of accumulated amortization of 1,726 and 1,647 as of december 31, 2002 and 2001, respectively
                                                                                                   3,854,000     
        unrealized loss on derivatives
                                                                                                        
        intangible assets, net of accumulated amortization of 1,908 and 1,647 as of september 30, 2002 and december 31, 2001, respectively
                                                                                                        
        intangible assets, net of accumulated amortization of 1,819 and 1,647 as of june 30, 2002 and december 31, 2001, respectively
                                                                                                        
        intangible assets, net of accumulated amortization of 1,731 and 1,647 as of march 31, 2002 and december 31, 2001, respectively
                                                                                                        
        intangible assets, net of accumulated amortization of 1,647 and 1,380 as of december 31, 2001 and 2000, respectively
                                                                                                        
        accumulated other comprehensive income
                                                                                                        
      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 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 2003-09-30 
                                                                                               
          cash flows from operating activities:
                                                                                               
          net income
        170,900,000 101,800,000 227,000,000 241,500,000 203,800,000 221,100,000 238,100,000 199,000,000 146,900,000 189,200,000 183,200,000 202,700,000 190,100,000 211,600,000 262,500,000 301,500,000 254,200,000 216,500,000 250,800,000 207,300,000 166,500,000 123,600,000 139,100,000 56,600,000 141,700,000 136,200,000 179,800,000 193,600,000 186,800,000 204,600,000 206,700,000 186,600,000 140,100,000 268,900,000 139,100,000 143,200,000 117,400,000 110,700,000 119,300,000 115,900,000 103,700,000 104,200,000 127,800,000 114,000,000 90,800,000 98,512,000 104,445,000 99,557,000 90,086,000 227,025,000 84,180,000 64,465,000 60,613,000 61,031,000 39,791,000 45,154,000 17,844,000 39,465,000 41,777,000 39,368,000 37,417,000 54,891,000 93,320,000 38,030,000 19,194,000 58,683,000 72,655,000 108,881,000 25,676,000 30,242,000 38,102,000 46,227,000 31,191,000 40,052,000 43,748,000 32,245,000 8,987,000 1,659,000 10,566,000 27,760,000 12,619,000 36,267,000 25,673,000 13,626,000 -6,836,000 177,000 -32,336,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                                               
          depreciation, depletion, and amortization of intangibles
        225,200,000 221,600,000 152,600,000 140,600,000 138,000,000 136,000,000 132,700,000 128,500,000 128,400,000 130,900,000 129,400,000 127,900,000 129,500,000 118,800,000 114,000,000 114,300,000 109,700,000 106,400,000 105,600,000 104,700,000 100,800,000 100,900,000 100,500,000 108,200,000 100,300,000 98,900,000 97,900,000 95,900,000 94,800,000 97,300,000 101,400,000 104,100,000 108,100,000 107,700,000 97,500,000 93,700,000 92,500,000 93,700,000 88,000,000 87,600,000 88,700,000                                               
          amortization of deferred financing costs
        800,000 800,000 3,500,000 500,000 500,000 500,000 600,000 600,000 600,000 600,000 500,000 600,000 500,000 600,000 500,000 500,000 500,000 2,400,000 700,000 600,000 700,000 700,000 600,000 700,000 600,000 16,900,000 2,200,000 2,100,000 2,200,000 2,100,000 2,100,000 2,100,000 2,300,000 4,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 1,900,000 1,900,000                                               
          share-based compensation expense
        15,300,000 8,600,000 8,500,000 10,300,000 17,800,000 9,200,000 10,400,000 9,800,000 19,400,000 7,500,000 7,700,000 9,500,000 15,300,000 6,900,000 7,100,000 9,300,000 12,300,000 8,600,000 6,800,000 8,500,000 11,600,000 6,200,000 6,000,000 7,700,000 10,100,000 5,900,000 5,900,000 11,700,000 6,900,000 6,100,000 6,700,000 5,600,000 5,100,000 5,200,000 5,200,000 5,600,000 4,600,000 4,700,000 4,700,000 4,700,000 5,600,000 4,500,000 4,600,000 4,900,000 4,200,000 3,952,000 4,047,000 4,013,000 3,588,000 4,805,000 3,182,000 3,137,000 3,637,000 3,210,000 2,746,000 3,137,000 2,594,000 2,545,000 2,487,000 2,954,000 1,750,000 1,603,000 1,615,000 2,552,000 1,236,000 1,240,000 1,510,000 3,271,000 1,240,000 1,254,000 3,630,000 3,062,000 1,520,000 1,486,000 1,523,000             
          deferred income tax provision
        17,400,000 -12,100,000 106,600,000 -6,000,000 8,800,000    8,400,000 12,900,000 -2,300,000 -8,100,000 2,700,000 38,700,000 18,500,000 5,900,000 22,900,000 17,700,000 27,400,000 2,300,000 12,000,000 13,600,000 1,900,000 5,700,000 13,500,000 22,000,000 11,400,000 8,100,000 18,800,000  4,800,000 14,200,000 15,900,000  -2,300,000 -8,300,000 12,200,000 -10,500,000 5,200,000 -6,800,000 8,100,000 500,000 -5,800,000 -400,000 7,400,000 -14,827,000 -2,156,000 3,938,000 15,645,000 -167,154,000 12,603,000 -8,122,000 -877,000 151,757,000 14,539,000 12,401,000 4,505,000 35,099,000 -6,149,000 -7,283,000 5,680,000 -111,677,000 -5,263,000 -10,164,000 6,525,000 -9,479,000 -10,793,000 11,438,000 -4,985,000 -1,911,000 -8,893,000  4,318,000    1,734,000      8,690,000     
          net loss on asset disposals
        1,600,000 44,100,000 5,000,000 -23,500,000 3,800,000 6,600,000 5,500,000 2,200,000 5,200,000 3,900,000 2,000,000 1,400,000 1,800,000 4,100,000                                                                          
          pension and post-retirement benefits expense, net of contributions
        300,000 1,900,000 1,900,000 2,100,000 2,100,000 1,300,000 -23,900,000 1,600,000 1,500,000 5,000,000 -45,600,000 4,800,000 5,000,000 700,000 -49,800,000 900,000 800,000 -100,000 -50,100,000 -100,000 -200,000 4,700,000 -67,000,000 -2,100,000 1,000,000 3,500,000 -41,700,000 4,000,000 7,300,000 5,800,000 -11,700,000                                                         
          other
        300,000 -7,200,000 3,800,000 4,800,000 -1,300,000 500,000 1,500,000 14,000,000 8,200,000 2,300,000 -1,700,000 5,900,000 6,800,000 -2,000,000 3,800,000 -3,600,000 3,800,000 3,000,000 4,700,000 500,000 3,700,000 -600,000 4,700,000 8,600,000 5,500,000 -4,800,000 900,000 4,500,000 4,200,000 -1,100,000 4,400,000 4,800,000 -1,000,000 -9,000,000 11,300,000 2,500,000 -1,800,000 -9,600,000 -500,000 2,100,000 2,100,000 -10,600,000 -5,600,000 1,300,000 -5,400,000 -5,087,000 4,289,000 -2,890,000 2,788,000 -512,000 465,000 -1,682,000 721,000 264,000 -10,245,000 1,413,000 5,478,000 2,098,000 -6,534,000 -90,000 5,491,000 2,089,000 1,202,000 2,502,000 6,432,000 1,990,000 -7,881,000 2,651,000 -4,788,000 7,395,000 -1,435,000 905,000 1,697,000 3,370,000 -3,843,000 1,541,000 3,594,000           
          changes in operating assets and liabilities, net of acquisitions:
                                                                                               
          decrease in assets —
                                                                                               
          accounts receivable
        -79,100,000 100,300,000 -59,500,000 -31,000,000 -20,100,000 72,100,000 -70,800,000 -100,100,000 -11,900,000 12,000,000 -21,200,000 7,400,000 400,000 80,900,000 99,300,000 -71,300,000 -69,600,000 7,100,000 -85,300,000 -72,800,000 -76,200,000 32,200,000 -47,300,000 62,300,000 -34,000,000 86,700,000 14,600,000 -16,500,000 -28,400,000 92,800,000 -66,200,000 -59,800,000 -22,900,000 27,100,000 -76,100,000 -22,000,000 -44,100,000 32,400,000 -9,100,000 -32,000,000 5,100,000 47,000,000 24,400,000 -30,500,000 -31,400,000 66,470,000 -27,330,000 -4,211,000 -43,429,000 26,392,000 -6,358,000 -11,684,000 -39,541,000 27,533,000 -26,148,000 -5,255,000 -21,125,000 22,428,000 -5,013,000 -18,704,000 -15,657,000 41,839,000 -26,335,000 -32,938,000 -32,822,000 30,548,000 -8,396,000 -8,127,000 -423,000 50,996,000 -10,551,000              4,394,000   
          inventories
        -15,000,000 32,500,000 -8,400,000 -4,000,000 -15,700,000 -63,000,000 -32,400,000 -25,900,000 9,500,000 -27,000,000 6,100,000 11,200,000 -26,100,000 17,600,000 -41,100,000 -12,900,000 -38,800,000 -13,200,000 -52,900,000 -27,700,000 -11,700,000 -10,200,000 56,900,000 -24,700,000 -15,700,000 12,200,000 9,300,000 16,000,000 -36,100,000 -13,000,000 -16,900,000 2,700,000 -8,400,000 -8,000,000 -2,200,000 10,100,000 -20,900,000 -29,800,000 -1,400,000 21,200,000 -15,700,000 19,100,000 -28,400,000 19,600,000 -22,200,000 -49,880,000 -9,243,000 -242,000 -13,035,000 31,429,000 -3,884,000 7,173,000 -1,414,000 -7,995,000 -2,152,000 4,663,000 -6,728,000 -6,987,000 -16,881,000 8,309,000 7,226,000 -15,017,000 -18,864,000 7,764,000 -2,235,000 -4,660,000 -906,000 -1,433,000 1,501,000 2,200,000 -4,112,000      5,847,000       -2,230,000 6,259,000   
          prepaid expenses and other current assets
        -18,500,000 -4,500,000 26,000,000 49,100,000 12,300,000 25,000,000 12,600,000 7,100,000 -149,400,000 2,600,000 10,700,000 11,800,000 -29,300,000 9,100,000 7,200,000 2,800,000 -30,100,000 9,100,000 22,900,000 -15,700,000 -19,000,000 6,000,000 9,300,000 8,100,000 -23,000,000 -1,300,000 15,600,000 -1,500,000 -19,700,000 11,100,000 6,000,000 -2,200,000 -17,000,000 5,100,000 9,700,000 -4,600,000 -15,400,000  16,300,000 -13,600,000 -13,900,000 20,900,000 8,000,000 -20,300,000 -4,500,000 22,782,000 -385,000 -18,820,000 -8,677,000 7,282,000 6,499,000 -11,832,000 -3,863,000 7,752,000 6,597,000 -7,522,000 -7,662,000 4,653,000 7,576,000 -9,309,000 -3,536,000 4,097,000 27,014,000 -21,191,000 -13,876,000 -2,168,000 16,396,000 -18,235,000 -5,451,000 7,125,000 6,010,000                 
          increase in liabilities —
                                                                                               
          accounts payable
        36,500,000 -54,500,000 -17,400,000 2,600,000 26,800,000 -17,800,000 -17,000,000 51,600,000 1,500,000 12,500,000 31,100,000 -27,200,000 -5,000,000 -27,000,000 -16,200,000 -38,500,000 63,600,000 -10,100,000 25,000,000 9,600,000 -12,300,000 45,900,000 31,600,000 -66,300,000 28,500,000 -30,100,000 -500,000 -15,000,000 13,200,000 -37,200,000 8,600,000 12,000,000 -1,000,000 3,300,000 18,900,000 -6,800,000 25,600,000 3,000,000 17,600,000 -4,300,000 300,000 -23,200,000 -3,700,000 3,200,000 -13,600,000 -23,043,000 -6,699,000 -10,513,000 4,255,000 7,804,000 -982,000 23,863,000 23,537,000 -29,798,000 13,195,000 -18,915,000 -4,930,000 -23,168,000 -13,927,000 20,850,000 15,551,000 -14,346,000 691,000 7,565,000 31,457,000 10,079,000 -7,987,000 4,686,000 15,697,000 -37,251,000 5,022,000 7,821,000 6,537,000     9,672,000   7,614,000     14,015,000 5,484,000 
          accrued liabilities
        -39,400,000 -16,700,000 70,000,000 -47,200,000 -77,300,000 -54,600,000 66,500,000 22,000,000 70,300,000 -4,400,000 39,200,000 22,000,000 -65,000,000 -10,300,000 36,900,000 34,100,000 -52,400,000 -15,600,000 38,100,000 31,200,000 -15,800,000 -32,200,000 36,700,000 14,300,000 -22,000,000 -15,500,000 37,700,000 21,700,000 -44,000,000 -18,200,000 43,400,000 23,200,000 -42,900,000 -1,200,000 33,700,000 24,400,000 -48,500,000 -14,000,000 34,100,000 20,200,000 -43,500,000 -20,700,000 25,300,000 28,700,000 -48,800,000 -14,810,000 31,585,000 -15,658,000 5,883,000 -41,700,000 4,881,000 -7,348,000 -10,640,000 27,740,000 -8,965,000 1,744,000 -22,827,000 -10,433,000 25,995,000 22,789,000 -32,299,000 18,015,000 7,442,000 19,149,000 -33,352,000 -9,028,000 19,790,000 10,834,000 -16,832,000 -11,628,000 6,405,000   11,744,000 13,621,000   5,561,000          
          federal and state income taxes payable/receivable
        13,000,000 30,000,000 -47,400,000 -40,200,000 39,600,000 -25,300,000 15,400,000 -17,800,000 21,800,000                                                                               
          net cash from operating activities
        329,300,000 446,600,000 472,200,000 299,600,000 339,100,000 325,400,000 327,100,000 278,300,000 260,400,000 335,300,000 339,500,000 359,900,000 280,400,000 420,100,000 430,600,000 319,000,000 325,300,000 390,700,000 283,600,000 228,200,000 191,600,000 271,100,000 298,200,000 226,800,000 236,700,000 329,200,000 339,800,000 302,400,000 236,000,000 345,600,000 301,000,000 331,000,000 202,500,000 272,800,000 197,700,000 221,500,000 164,100,000 213,000,000 217,100,000 180,100,000 191,000,000 220,600,000 237,500,000 196,200,000 108,300,000 179,380,000 222,577,000 184,844,000 149,299,000 188,033,000 137,131,000 187,270,000 95,767,000 152,394,000 101,766,000 115,100,000 34,945,000 108,697,000 71,634,000 101,233,000 63,950,000 138,879,000 102,457,000 94,080,000 14,504,000 96,838,000 68,045,000 90,569,000 50,679,000 87,337,000 71,343,000 102,417,000 27,236,000 100,076,000 66,764,000 79,276,000 516,000  74,852,000 75,215,000 18,626,000 112,117,000 62,999,000   95,918,000 72,917,000 
          capital expenditures
        -164,700,000 -319,000,000 -192,100,000 -169,700,000 -148,100,000 -201,300,000 -146,700,000 -245,000,000 -76,700,000 -141,100,000 -89,800,000 -126,400,000 -112,400,000 -247,100,000 -179,600,000 -184,300,000 -213,200,000 -238,900,000 -149,700,000 -131,400,000 -85,100,000 -167,700,000 -102,300,000 -80,700,000 -70,500,000 -135,700,000 -92,900,000 -92,100,000 -78,800,000 -147,100,000 -130,400,000 -165,900,000 -108,000,000 -116,800,000 -86,800,000 -81,600,000 -57,800,000 -86,200,000 -66,300,000 -68,900,000 -52,900,000 -96,600,000 -76,000,000 -86,300,000 -55,600,000 -165,335,000 -106,682,000 -97,250,000 -50,933,000 -49,519,000 -53,615,000 -27,276,000 -34,128,000 -25,074,000 -34,509,000 -34,813,000 -65,255,000 -69,808,000 -80,419,000 -64,731,000 -89,274,000 -75,577,000 -92,212,000 -63,137,000 -45,597,000 -18,306,000 -22,354,000 -27,940,000 -34,704,000 -32,637,000    
          free cash flows
        164,600,000 127,600,000 280,100,000 129,900,000 191,000,000 124,100,000 180,400,000 33,300,000 183,700,000 194,200,000 249,700,000 233,500,000 168,000,000 173,000,000 251,000,000 134,700,000 112,100,000 151,800,000 133,900,000 96,800,000 106,500,000 103,400,000 195,900,000 146,100,000 166,200,000 193,500,000 246,900,000 210,300,000 157,200,000 198,500,000 170,600,000 165,100,000 94,500,000 156,000,000 110,900,000 139,900,000 106,300,000 126,800,000 150,800,000 111,200,000 138,100,000 124,000,000 161,500,000 109,900,000 52,700,000 14,045,000 115,895,000 87,594,000 98,366,000 188,033,000 87,612,000 133,655,000 68,491,000 118,266,000 76,692,000 80,591,000 132,000 43,442,000 1,826,000 20,814,000 -781,000 49,605,000 26,880,000 1,868,000 -48,633,000 51,241,000 49,739,000 68,215,000 22,739,000 52,633,000 38,706,000 102,417,000 27,236,000 100,076,000 66,764,000 79,276,000 516,000  74,852,000 75,215,000 18,626,000 112,117,000 62,999,000   95,918,000 72,917,000 
          cash flows from investing activities:
                                                                                               
          additions to property, plant, and equipment
        -164,700,000 -319,000,000 -192,100,000 -169,700,000 -148,100,000 -201,300,000 -146,700,000 -245,000,000 -76,700,000 -141,100,000 -89,800,000 -126,400,000 -112,400,000 -247,100,000 -179,600,000 -184,300,000 -213,200,000 -238,900,000 -149,700,000 -131,400,000 -85,100,000 -167,700,000 -102,300,000 -80,700,000 -70,500,000 -135,700,000 -92,900,000 -92,100,000 -78,800,000 -147,100,000 -130,400,000 -165,900,000 -108,000,000 -116,800,000 -86,800,000 -81,600,000 -57,800,000 -86,200,000 -66,300,000 -68,900,000 -52,900,000 -96,600,000 -76,000,000 -86,300,000 -55,600,000 -165,335,000 -106,682,000 -97,250,000 -50,933,000                                       
          acquisition of business, net of cash acquired
        -14,800,000                                                                                    
          additions to other long-term assets
        -1,900,000 -300,000 -200,000 -300,000 -1,600,000 -200,000 -300,000 -1,400,000 -100,000 -300,000 -600,000 -1,600,000 -400,000 -3,200,000 -200,000 -2,400,000                     -1,000,000 -3,200,000 -3,300,000 -2,900,000  -3,100,000                                             
          proceeds from asset disposals
        600,000 100,000 300,000 32,300,000 700,000 500,000 200,000 500,000 100,000 100,000 1,100,000 100,000 300,000 400,000 1,400,000 200,000 200,000 5,300,000 200,000 1,700,000 700,000                                                                   
          purchase of short-term investment in time deposit
        -50,000,000                                                                                       
          purchases of available-for-sale debt securities
        -57,400,000 -14,200,000 -27,300,000 -40,400,000 -31,600,000 -22,400,000 -29,300,000 -29,800,000 -32,800,000                                                                               
          proceeds from sales of available-for-sale debt securities
        8,100,000 21,900,000 6,600,000 3,900,000 8,700,000 4,800,000 2,300,000 1,500,000                                                                               
          proceeds from maturities of available-for-sale debt securities
        19,200,000 26,000,000 16,600,000 31,400,000 27,700,000 15,100,000 23,000,000 31,800,000 28,300,000                                                                               
          net cash from investing activities
        -260,900,000 -285,500,000 -2,000,400,000 -142,800,000 -144,200,000 -203,300,000 249,300,000 -242,800,000 -81,000,000 -544,000,000 -88,900,000 -126,800,000 -115,400,000 -251,800,000 -183,800,000 -176,900,000 -221,200,000 -429,400,000 -144,800,000 -132,700,000 -87,500,000 -170,200,000 -127,100,000 -51,800,000 -77,000,000 -278,300,000 -95,500,000 -92,700,000 -80,100,000 -202,900,000 -131,800,000 -166,300,000 -107,200,000 -381,500,000 -86,700,000 -83,100,000 -57,800,000 -186,900,000 -455,000,000 -72,200,000 -55,500,000 -95,300,000 -78,900,000 -66,300,000 -57,600,000 -167,516,000 -112,273,000 -117,709,000 -53,602,000 -1,278,889,000 -49,666,000 -53,893,000 -28,960,000 -33,964,000 -24,649,000 22,842,000 -71,739,000 -89,018,000 -82,944,000 -111,716,000 -66,487,000 -89,622,000 -74,725,000 -92,705,000 -64,262,000 -45,675,000 -21,583,000 -22,756,000 -29,310,000 -34,338,000 -32,867,000                 
          cash flows from financing activities:
                                                                                               
          repayments of debt and finance lease obligations
        -600,000 -600,000 -600,000 -500,000 -500,000 -500,000 -400,400,000 -500,000 -500,000 -500,000 -500,000 -400,000 -500,000 -400,000 -400,000 -500,000 -400,000 -756,500,000 -400,000 -400,000 -400,000 -400,000 -300,000 -400,000 -400,000  -400,000 -400,000 -300,000                                                           
          common stock dividends paid
        -111,900,000 -112,500,000 -112,400,000 -112,400,000 -112,300,000 -112,300,000 -112,300,000 -112,200,000 -112,000,000 -112,000,000 -112,400,000 -112,400,000 -112,100,000 -115,900,000 -117,200,000 -93,600,000 -93,600,000 -95,000,000 -95,000,000 -95,000,000 -94,800,000 -75,000,000 -74,900,000 -74,900,000 -74,800,000 -74,800,000 -74,600,000 -74,600,000 -74,700,000 -74,700,000 -74,500,000 -59,500,000 -59,400,000 -59,400,000 -59,400,000 -59,400,000 -59,400,000 -59,400,000 -51,800,000 -51,800,000 -53,100,000 -53,500,000 -53,800,000 -54,100,000 -39,400,000 -39,396,000 -39,359,000 -39,348,000 -39,297,000 -39,262,000 -39,225,000   -49,075,000 -24,480,000 -24,631,000 -19,665,000 -19,959,000 -20,258,000 -20,444,000 -15,351,000 -15,432,000 -15,455,000 -15,460,000 -15,451,000 -15,442,000 -15,377,000 -15,360,000 -30,719,000 -31,097,000 -31,157,000                 
          repurchases of common stock
        -58,800,000            -380,600,000                        -100,300,000 -56,600,000 -54,800,000 -35,700,000 -7,600,000     -2,650,000 -1,809,000 -3,340,000 -3,638,000 -8,219,000 -10,075,000 -23,230,000 -31,602,000 -48,033,000 -26,297,000 -19,095,000 -14,100,000 -21,690,000       -20,332,000 -8,498,000                 
          shares withheld to cover employee restricted stock taxes
        -29,000,000 -200,000 -300,000 -7,700,000 -15,400,000 -900,000 -700,000 -1,600,000 -22,500,000 -100,000 -10,900,000 -4,700,000 -100,000 -5,800,000 -9,300,000 -200,000 -1,000,000 -1,400,000 -10,400,000 -100,000 -100,000   -100,000 -400,000   -200,000 -7,600,000 -100,000 -100,000 -200,000 -10,000,000 -500,000 -1,000,000 -100,000 -8,000,000 -2,100,000 -1,300,000 -7,100,000 -300,000 -1,149,000 -292,000 -9,364,000 -2,395,000 -82,000                                      
          net cash from financing activities
        -200,300,000 -266,100,000 1,374,300,000 -120,600,000 -128,200,000 -113,700,000 -513,400,000 -114,300,000 -135,000,000 283,500,000 -154,500,000 -123,700,000 -117,300,000 -497,000,000 -265,400,000 -103,400,000 -94,200,000 -1,045,500,000 591,900,000 -106,700,000 -95,300,000 -75,400,000 -75,300,000 -85,700,000 -75,200,000 -109,700,000 -75,400,000 -82,700,000 -75,000,000 -75,000,000 -75,000,000 -67,500,000 -209,800,000 -44,900,000 -61,500,000 -71,400,000 -91,600,000 -66,600,000 304,100,000 -56,600,000 -157,400,000 -128,000,000 -135,400,000 -92,600,000 -49,200,000 -41,327,000 -117,972,000 -90,850,000 -100,951,000 885,221,000 -60,927,000 -31,357,000 -6,163,000 -51,943,000 -451,332,000 293,162,000 -35,502,000 96,517,000 -67,754,000 -43,350,000 -21,005,000 -25,521,000 -36,423,000 -17,465,000 -13,368,000 -14,723,000 -15,119,000 -14,892,000 -30,743,000 -51,569,000 -188,113,000                 
          net increase in cash and cash equivalents
        -131,900,000 -105,000,000 -153,900,000 36,200,000 66,700,000 8,400,000 63,000,000 -78,800,000 44,400,000 74,800,000 96,100,000 109,400,000 47,700,000 -328,700,000 -18,600,000 38,700,000 9,900,000 -1,084,200,000 730,700,000 -11,200,000 8,800,000 25,500,000 95,800,000 89,300,000 84,500,000 -58,800,000 168,900,000 127,000,000 80,900,000 67,700,000 94,200,000 97,200,000 -114,500,000 -153,600,000 49,500,000 67,000,000 14,700,000 -40,500,000 66,200,000 51,300,000 -21,900,000 -2,700,000 23,200,000 37,300,000 1,500,000 -29,463,000 -7,668,000 -23,715,000 -5,254,000 -205,635,000 26,538,000 102,020,000 60,644,000         23,736,000 -8,691,000   36,440,000 31,343,000 52,921,000 -9,374,000 1,430,000 -149,637,000                 
          cash and cash equivalents, beginning of period
        529,000,000  685,000,000  648,000,000  320,000,000  618,700,000  974,600,000  679,500,000  361,500,000  216,900,000  239,300,000  184,200,000  124,900,000  190,960,000  207,393,000  156,313,000  196,556,000  260,727,000  149,397,000  161,837,000  112,669,000  213,321,000  172,022,000 
          cash and cash equivalents, end of period
        397,100,000  -153,900,000 36,200,000 751,700,000  63,000,000 -78,800,000 692,400,000  96,100,000 109,400,000 367,700,000  -18,600,000 38,700,000 628,600,000  730,700,000 -11,200,000 983,400,000  95,800,000 89,300,000 764,000,000  168,900,000 127,000,000 442,400,000  94,200,000 97,200,000 102,400,000  49,500,000 67,000,000 254,000,000  66,200,000 51,300,000 162,300,000  23,200,000 37,300,000 126,400,000  -7,668,000 -23,715,000 185,706,000  26,538,000 102,020,000 268,037,000  -374,215,000 431,104,000 84,017,000  -79,064,000 -53,833,000 173,014,000  -8,691,000 -16,090,000 197,601,000  31,343,000 52,921,000 140,023,000  -149,637,000 60,781,000 147,294,000  24,153,000 26,223,000 67,855,000  18,975,000 -14,745,000 180,199,000  28,186,000 3,592,000 87,589,000 55,371,000 -14,800,000 
          purchases of held-to-maturity debt securities
                                                                                               
          proceeds from maturities of held-to-maturity debt securities
                                                                                              
          proceeds from issuance of debt, net of discount and lender fees
                                                                                              
          financing costs paid
         200,000                6,100,000 -7,600,000                   100,000        -191,000    -11,199,000    -55,000 71,000               -101,000 -240,000                 
          cash and cash equivalents, beginning of year
                                                                                               
          cash and cash equivalents, end of year
                                                                                               
          changes in operating assets and liabilities:
                                                                                               
          net proceeds received from issuance of debt
                                                                                               
          deferred income tax benefit
              -12,100,000                                                                                 
          increase in assets —
                                                                                               
          loss on early extinguishment of debt
                                                                                              
          federal and state income tax payable/receivable
                                                                                               
          purchases of marketable debt securities
                  -20,400,000 -26,100,000 -29,600,000 -28,100,000 -33,800,000 -27,800,000 -36,400,000 -27,100,000 -34,600,000 -34,300,000 -31,400,000                                                                   
          proceeds from sales of marketable debt securities
                  1,000,000   2,700,000 8,500,000 12,100,000 7,800,000 9,000,000 4,800,000 1,500,000 11,400,000                                                                   
          proceeds from maturities of marketable debt securities
                  19,500,000 25,000,000 27,900,000 20,700,000 22,900,000 21,200,000 22,800,000 17,200,000 34,700,000 30,100,000 18,200,000                                                                   
          federal and state income taxes receivable
                   -10,000,000 53,700,000                                                                           
          goodwill impairment
                                                                                             
          federal and state income tax payable / receivable
                                                                                               
          proceeds from issuance of debt
                                                    36,000                                          
          loss on asset disposals
                       9,300,000 2,800,000  1,900,000 1,700,000 3,700,000  1,800,000    4,800,000                                                             
          federal and state income taxes payable / receivable
                       -33,300,000 45,600,000  -12,000,000 -21,900,000 27,800,000  23,400,000 -9,800,000 30,200,000  1,900,000 -24,100,000 30,000,000  11,700,000 32,600,000 20,300,000  -22,400,000 -21,800,000 39,100,000  -16,900,000 -19,100,000 42,200,000  -500,000 -20,900,000 28,800,000                                           
          additions to other long term assets
                          -200,000 -300,000 -1,300,000  -1,100,000 -2,400,000 -2,700,000 700,000 -2,700,000 -500,000 -1,300,000 -400,000 -1,400,000 -800,000 -1,900,000 -900,000 -1,400,000 -2,600,000 -2,900,000        -2,600,000 -883,000 -5,668,000 -3,203,000 -2,746,000 -675,000 -263,000 -466,000 -1,730,000 111,000 420,000 -195,000 -1,406,000 -2,082,000 -4,443,000 -4,485,000 -2,045,000 -508,000 -408,000 -531,000 -1,180,000 -164,000 -141,000 -419,000 -1,381,000 -385,000 -357,000                 
          net loss on impairment of assets
                                                                                               
          acquisitions of businesses, net of cash acquired
                                                                                               
          purchases of marketable debt securities, net of redemptions
                                -3,900,000                                                               
          proceeds from disposals
                              100,000 4,200,000 100,000  200,000    400,000 100,000  1,500,000 1,200,000 1,700,000                                                   
          redemptions of marketable debt securities, net of purchases
                                                                                               
          net income on impairment of assets
                                                                                              
          decrease (increase) in assets —
                                                                                               
          repayments of debt and capital lease obligations
                                     -300,000 -300,000 -400,000 -150,300,000 -976,300,000 -1,900,000 -2,000,000 -31,700,000  -26,900,000 -1,900,000 -1,900,000  -26,900,000 -1,900,000 -1,900,000  -474,135,000 -50,255,000 -66,251,000                                       
          pension and post retirement benefits expense, net of contributions
                                        3,900,000 4,900,000 -30,200,000              6,155,000                                       
          proceeds from sale of a business
                                                                                             
          pension and postretirement benefits expense, net of contributions
                                            1,100,000  -42,200,000 2,300,000 6,400,000  8,400,000 7,900,000 7,700,000  6,573,000                                         
          excess tax benefits from stock based awards
                                            300,000                                                   
          loss on disposals of property, plant, and equipment
                                                                                               
          repayments of debt
                                                                                               
          proceeds from exercise of stock options
                                                     -39,000 391,000 3,348,000 92,000 631,000 418,000 1,707,000 3,777,000 4,937,000 963,000 10,221,000 146,000 535,000 3,130,000 3,205,000 3,988,000 747,000 855,000 1,906,000 1,366,000 -344,000 579,000 14,000 19,000 1,569,000 4,594,000 5,515,000 2,143,000 3,780,000 520,000 1,311,000 1,097,000 1,406,000         
          excess tax benefits from stock-based awards
                                             400,000 200,000   400,000 200,000 5,100,000 300,000 404,000 227,000 7,910,000 3,659,000                                       
          depreciation, depletion, and amortization of intangibles and deferred financing costs
                                                 90,600,000 89,700,000 88,700,000 95,300,000 94,314,000 107,366,000 103,080,000 86,040,000                                       
          alternative energy tax credits
                                                                                               
          (gain) loss on disposal of assets
                                                                                               
          non-cash deridder restructuring items
                                                                                               
          treasury grant proceeds
                                                                                             
          settlement of treasury lock
                                                               9,910,000                         
          depreciation, depletion, and amortization
                                                                                               
          depreciation, depletion and amortization
                                                          44,096,000 43,064,000 42,678,000 43,286,000 42,912,000 42,444,000 42,638,000 42,940,000 41,099,000 40,638,000 39,296,000 39,528,000 39,042,000 39,087,000 38,641,000 39,317,000 37,621,000 37,347,000 36,932,000 38,942,000 36,332,000 36,887,000 37,595,000 38,830,000 38,698,000 38,944,000 38,360,000 40,339,000 40,024,000 40,257,000 38,476,000 40,639,000 40,026,000 39,468,000 38,775,000 40,098,000 39,755,000 
          amortization of financing costs
                                                          2,922,000 205,000 205,000 204,000 516,000 200,000 196,000 351,000 111,000 112,000 138,000 152,000 152,000 153,000 191,000 192,000 191,000 192,000 197,000 196,000 110,000 172,000 172,000 172,000 171,000 172,000 172,000 172,000 171,000 172,000 172,000 172,000 171,000 170,000 171,000 215,000 233,000 
          amortization of net income on treasury lock
                                                          1,415,000   1,414,000                                  
          alternative fuel mixture credits
                                                          3,843,000 65,508,000 6,929,000 -3,845,000 15,461,000                                 
          loss on disposals of property, plant and equipment
                                                          1,692,000 1,206,000 2,249,000 2,630,000 996,000 1,260,000 2,412,000 167,000 1,555,000 2,060,000 3,355,000 4,231,000 797,000 1,027,000 2,810,000 2,015,000 233,000 1,980,000 2,377,000 239,000 1,230,000 1,170,000 1,043,000 451,000 1,201,000 1,155,000 1,283,000 4,690,000 1,102,000 1,066,000 369,000  621,000 -587,000 1,022,000  1,629,000 
          pension and postretirement benefits
                                                          -17,423,000 17,903,000 10,120,000 9,462,000                         -4,797,000    -1,294,000 2,968,000 2,387,000  551,000 
          changes in operating assets and liabilities, excluding effects of acquisition:
                                                                                               
          additions to property, plant and equipment
                                                          -49,519,000 -53,615,000 -27,276,000 -34,128,000 -25,074,000 -34,509,000 -34,813,000 -65,255,000 -69,808,000 -80,419,000 -64,731,000 -89,274,000 -75,577,000 -92,212,000 -63,137,000 -45,597,000 -18,306,000 -22,354,000 -27,940,000 -34,704,000 -32,637,000                 
          acquisition of business
                                                                -35,531,000                               
          proceeds from disposals of property, plant and equipment
                                                          116,000 188,000 46,000 53,000 5,000 9,000 11,000 16,000 8,000 130,000 289,000 160,000 1,260,000 38,000 55,000 86,000 17,000 11,000 751,000 127,000 58,000 168,000 910,000 1,660,000 147,000 125,000 27,000 173,000 6,000 8,000 -2,000,000 35,000 2,000,000 1,262,000 256,000 650,000 
          proceeds on long-term debt
                                                                                               
          payments on long-term debt
                                                          -3,993,000 -3,989,000 -3,985,000 -3,982,000 -425,273,000 -3,974,000 -3,955,000 -172,000 -168,000 -167,000 -163,000 -161,000 -158,000 -154,000 -153,000 -149,000 -148,000 -144,000 -165,000 -172,000 -150,033,000                 
          excess tax benefits from share-based awards
                                                          2,095,000 4,681,000 763,000 1,030,000 1,632,000 227,000 1,127,000 145,000 170,000 428,000 489,000 184,000 133,000 405,000 330,000  750,000 33,000 127,000   76,000 247,000               
          amortization of net (gain) loss on treasury lock
                                                            1,413,000                                   
          changes in operating assets and liabilities
                                                                                               
          acquisitions of businesses
                                                                                              
          proceeds from long-term debt
                                                                                             
          cellulosic biofuel producer credit reduction
                                                              142,251,000                               
          changes in operating assets and liabilities, excluding effects of acquisitions:
                                                                                               
          net decrease in cash and cash equivalents
                                                                -72,296,000 116,196,000 -79,064,000 -53,833,000 -23,542,000    -63,126,000                       
          amortization of net loss on treasury lock
                                                                                               
          acquisition of businesses
                                                                                               
          amortization of net gain on treasury lock
                                                                -462,000 -461,000 -462,000 -461,000 -462,000 -462,000 -461,000 -461,000 -462,000 -461,000 -462,000 -461,000 -462,000 -462,000 -507,000                 
          alternative fuel mixture credit increase
                                                                -119,239,000                               
          alternative fuel mixture tax credits receivable
                                                                       41,005,000 -9,235,000 -21,430,000 -43,926,000                     
          acquisition of businesses, net of cash acquired
                                                                                               
          proceeds from sale of investment
                                                                                               
          proceeds from long-term debt issued
                                                                                            76,000  
          amortization of gain on treasury lock
                                                                                               
          increase in assets—
                                                                                               
          accounts and notes receivable
                                                                                               
          increase (decrease) in liabilities—
                                                                                               
          acquistion of business.
                                                                                               
          (increase) decrease in assets—
                                                                                               
          adjustments to reconcile net income to net cash provided by operating activities:
                                                                                               
          amortization of treasury lock
                                                                                               
          gain from joint venture dividends
                                                                                               
          decrease in assets—
                                                                                               
          increase in liabilities—
                                                                                               
          joint venture dividends
                                                                                               
          gain from joint venture dividend
                                                                                               
          excess tax benefits from share-based compensation expense
                                                                                               
          joint venture dividend
                                                                                              
          net increase (decrease) in cash and cash equivalents
                                                                                               
          acquistion of business
                                                                                               
          share-based compensation expense.
                                                                                    1,357,000           
          amortization of unearned compensation on restricted stock
                                                                                               
          tax benefit associated with stock options and restricted stock
                                                                                               
          net cash provided by operating activities
                                                                                               
          net cash used for investing activities
                                                                                               
          proceeds from settlement of treasury lock
                                                                                              
          net cash used for financing activities
                                                                                               
          loss—early extinguishment of debt
                                                                                               
          tax benefit associated with employee stock option exercises
                                                                                      433,000 2,432,000 2,248,000  3,197,000 785,000 2,978,000  2,790,000 
          changes in components of working capital
                                                                                               
          (increase) decrease in current assets—
                                                                                               
          prepaid expenses and other
                                                                                      17,139,000         
          increase (decrease) in current liabilities—
                                                                                               
          additions to long term assets
                                                                                               
          decrease in current liabilities—
                                                                                               
          deferred income taxes
                                                                                        1,158,000       
          pension and postemployment benefits
                                                                                        3,897,000       
          issuance of common stock upon exercise of stock options
                                                                                        3,845,000 759,000 2,925,000 2,991,000 3,723,000 4,949,000 3,708,000 
          loss-early extinguishment of debt
                                                                                               
          loss on disposal of property, plant and equipment
                                                                                               
          tax benefit associated with stock option exercises
                                                                                               
          decrease in current assets—
                                                                                               
          increase in current liabilities—
                                                                                               
          loss on extinguishment of debt
                                                                                          174,000   
          changes in components of working capital:
                                                                                               
          financing costs paid.
                                                                                               
          dividends paid
                                                                                               
          cumulative effect of accounting change
                                                                                               
          loss-early debt extinguishment
                                                                                               
          loss—early debt extinguishment
                                                                                               
          extraordinary loss—early debt extinguishment
                                                                                               
          increase in deferred income taxes
                                                                                               
          gain on sale of timberlands
                                                                                               
          proceeds from timberlands sales
                                                                                               
          investments in joint venture
                                                                                               
          redemption of preferred stock
                                                                                               
          proceeds from initial public offering
                                                                                               
          financing costs