7Baggers

Koppers Holdings Inc
(NYSE:KOP) 

KOP stock logo

Koppers Holdings Inc. provides treated wood products, wood treatment chemicals, and carbon compounds in the United States, Australasia, Europe, and internationally. The company operates through three segments: Railroad and Utility Products and Services (RUPS), Performance Chemicals (PC), and Carbon ...

Founded: 1912
Full Time Employees: 2,120
Sector: Basic Materials
Industry: Specialty Chemicals

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Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 
                                                                                         
      net sales
    455,300,000 432,700,000 485,300,000 504,800,000 456,500,000 477,000,000 554,300,000 563,200,000 497,600,000 513,200,000 550,400,000 577,200,000 513,400,000 482,600,000 536,100,000 502,500,000 459,300,000 405,300,000 424,800,000 441,000,000 407,500,000 393,100,000 437,500,000 436,600,000 401,900,000 393,200,000 474,900,000 469,800,000 434,900,000 425,400,000 442,700,000 436,000,000 406,100,000 366,100,000 384,800,000 378,000,000 346,600,000 313,200,000 371,100,000 385,100,000 346,800,000 363,700,000 433,800,000 431,600,000 397,800,000 426,700,000 440,100,000 356,800,000 331,400,000 341,800,000 395,200,000 370,900,000 370,400,000 374,900,000 387,900,000 411,300,000 380,900,000 385,200,000 401,000,000 393,600,000 359,100,000 307,800,000 336,300,000 327,100,000 274,300,000 270,300,000 289,800,000 291,600,000 272,700,000 288,900,000 369,400,000 375,300,000 347,500,000 326,800,000 347,100,000 360,000,000 321,100,000 282,600,000 314,400,000 297,900,000 264,600,000 262,300,000 269,600,000 266,300,000 232,000,000 
      yoy
    -0.26% -9.29% -12.45% -10.37% -8.26% -7.05% 0.71% -2.43% -3.08% 6.34% 2.67% 14.87% 11.78% 19.07% 26.20% 13.95% 12.71% 3.10% -2.90% 1.01% 1.39% -0.03% -7.88% -7.07% -7.59% -7.57% 7.27% 7.75% 7.09% 16.20% 15.05% 15.34% 17.17% 16.89% 3.69% -1.84% -0.06% -13.89% -14.45% -10.77% -12.82% -14.76% -1.43% 20.96% 20.04% 24.84% 11.36% -3.80% -10.53% -8.83% 1.88% -9.82% -2.76% -2.67% -3.27% 4.50% 6.07% 25.15% 19.24% 20.33% 30.92% 13.87% 16.05% 12.17% 0.59% -6.44% -21.55% -22.30% -21.53% -11.60% 6.42% 4.25% 8.22% 15.64% 10.40% 20.85% 21.35% 7.74% 16.62% 11.87% 14.05%     
      qoq
    5.22% -10.84% -3.86% 10.58% -4.30% -13.95% -1.58% 13.18% -3.04% -6.76% -4.64% 12.43% 6.38% -9.98% 6.69% 9.41% 13.32% -4.59% -3.67% 8.22% 3.66% -10.15% 0.21% 8.63% 2.21% -17.20% 1.09% 8.02% 2.23% -3.91% 1.54% 7.36% 10.93% -4.86% 1.80% 9.06% 10.66% -15.60% -3.64% 11.04% -4.65% -16.16% 0.51% 8.50% -6.77% -3.04% 23.35% 7.66% -3.04% -13.51% 6.55% 0.13% -1.20% -3.35% -5.69% 7.98% -1.12% -3.94% 1.88% 9.61% 16.67% -8.47% 2.81% 19.25% 1.48% -6.73% -0.62% 6.93% -5.61% -21.79% -1.57% 8.00% 6.33% -5.85% -3.58% 12.11% 13.62% -10.11% 5.54% 12.59% 0.88% -2.71% 1.24% 14.78%  
      cost of sales
    368,700,000 321,900,000 368,300,000 390,600,000 350,700,000 393,400,000 433,100,000 441,600,000 401,400,000 416,700,000 439,000,000 464,700,000 409,300,000 406,500,000 439,700,000 419,400,000 370,300,000 332,400,000 348,900,000 343,900,000 319,300,000 303,900,000 329,800,000 334,700,000 340,300,000 318,300,000 382,300,000 375,600,000 353,800,000 351,200,000 359,700,000 352,800,000 311,400,000 290,500,000 293,600,000 294,700,000 275,300,000 241,500,000 294,100,000 303,800,000 288,500,000 307,300,000 359,100,000 356,800,000 343,500,000 369,700,000 377,000,000 311,900,000 285,100,000 294,700,000 330,600,000 318,900,000 320,500,000 321,400,000 331,400,000 344,900,000 326,900,000 357,500,000 333,900,000 330,900,000 313,600,000 268,700,000 280,400,000 272,300,000 233,700,000 236,700,000 237,500,000 238,500,000 233,900,000 263,000,000 295,200,000 306,100,000 291,500,000 275,800,000 283,700,000 285,900,000 267,700,000 238,700,000 258,100,000 251,300,000 221,700,000 221,500,000 222,500,000 219,700,000 193,800,000 
      depreciation and amortization
    19,400,000 20,000,000 17,600,000 18,000,000 18,000,000 15,300,000 17,900,000 18,200,000 16,100,000 14,300,000 14,300,000 14,400,000 14,000,000 11,600,000 16,900,000 13,400,000 14,200,000 14,300,000 13,400,000 13,900,000 16,100,000 14,400,000 12,900,000 13,300,000 13,500,000 12,800,000 14,300,000 13,400,000 14,600,000 12,300,000 13,000,000 13,700,000 11,800,000 14,800,000 12,100,000 11,700,000 11,200,000 10,900,000 13,800,000 13,100,000 15,100,000 9,400,000 16,900,000 17,700,000 15,000,000 14,200,000 11,200,000 9,700,000 8,900,000 7,900,000 7,200,000 7,300,000 7,300,000 7,100,000 6,700,000 7,600,000 6,800,000 28,000,000 7,100,000 6,900,000 6,800,000 7,700,000 7,000,000 7,000,000 6,400,000 6,400,000 6,100,000 6,300,000 6,000,000 10,300,000 6,400,000 6,400,000 7,600,000 8,600,000 7,800,000 8,200,000 8,300,000 9,100,000 8,300,000 8,200,000 7,800,000 7,700,000 8,400,000 8,200,000 8,000,000 
      selling, general and administrative
    41,700,000 36,800,000 37,500,000 39,500,000 41,100,000 44,000,000 43,900,000 45,900,000 45,500,000 45,000,000 43,800,000 43,700,000 41,600,000 36,900,000 36,700,000 40,600,000 39,100,000 38,300,000 37,800,000 38,300,000 34,500,000 39,000,000 34,600,000 34,800,000 34,700,000 37,000,000 37,600,000 38,500,000 37,800,000 39,800,000 37,900,000 45,800,000 38,100,000 37,000,000 33,400,000 31,900,000 31,000,000 37,900,000 32,600,000 30,200,000 30,300,000 30,900,000 30,800,000 31,100,000 31,800,000 40,900,000 32,000,000 21,900,000 21,400,000 19,500,000 18,300,000 16,200,000 17,700,000 20,500,000 19,000,000 18,100,000 18,000,000 18,900,000 19,700,000 18,700,000 17,900,000 15,500,000 15,400,000 15,000,000 17,400,000 17,200,000 13,000,000 13,500,000 14,400,000 15,400,000 16,200,000 16,700,000 16,800,000 24,800,000 15,400,000 19,900,000 17,000,000 19,900,000 15,900,000 16,700,000 19,100,000 17,000,000 16,700,000 17,300,000 15,400,000 
      impairment and restructuring
    7,800,000 4,100,000 10,200,000 17,600,000 20,000,000                                                                                 
      (gain) on sale of assets
    -4,300,000    -300,000        -1,800,000    -2,500,000                                                                     
      operating profit
    22,000,000 49,900,000 51,800,000 39,100,000 27,000,000 6,400,000 49,700,000 57,500,000 34,600,000 37,200,000 53,300,000 54,400,000 50,300,000 27,600,000 42,800,000 29,100,000 38,200,000 43,700,000 24,600,000 44,300,000 43,900,000 34,800,000 58,600,000 49,700,000 13,600,000 24,300,000 39,600,000 38,500,000 28,400,000 13,600,000 31,200,000 22,300,000 43,300,000 12,200,000 34,700,000 37,600,000 27,600,000 18,900,000 27,700,000 32,000,000 7,800,000 -90,600,000 27,000,000 26,000,000 8,000,000 2,100,000 17,300,000 13,300,000 500,000 7,800,000 39,100,000 28,500,000 24,900,000 25,900,000 30,800,000 40,700,000 29,200,000 -19,200,000 40,300,000 37,100,000 20,800,000 15,900,000 33,500,000 32,800,000 16,800,000 10,000,000 33,200,000 33,300,000 18,400,000 200,000 51,600,000 46,100,000 31,600,000 17,600,000 40,200,000 46,000,000 28,100,000 14,900,000 32,100,000 21,700,000 16,000,000 16,100,000 22,000,000 21,100,000 14,800,000 
      yoy
    -18.52% 679.69% 4.23% -32.00% -21.97% -82.80% -6.75% 5.70% -31.21% 34.78% 24.53% 86.94% 31.68% -36.84% 73.98% -34.31% -12.98% 25.57% -58.02% -10.87% 222.79% 43.21% 47.98% 29.09% -52.11% 78.68% 26.92% 72.65% -34.41% 11.48% -10.09% -40.69% 56.88% -35.45% 25.27% 17.50% 253.85% -120.86% 2.59% 23.08% -2.50% -4414.29% 56.07% 95.49% 1500.00% -73.08% -55.75% -53.33% -97.99% -69.88% 26.95% -29.98% -14.73% -234.90% -23.57% 9.70% 40.38% -220.75% 20.30% 13.11% 23.81% 59.00% 0.90% -1.50% -8.70% 4900.00% -35.66% -27.77% -41.77% -98.86% 28.36% 0.22% 12.46% 18.12% 25.23% 111.98% 75.63% -7.45% 45.91% 2.84% 8.11%     
      qoq
    -55.91% -3.67% 32.48% 44.81% 321.88% -87.12% -13.57% 66.18% -6.99% -30.21% -2.02% 8.15% 82.25% -35.51% 47.08% -23.82% -12.59% 77.64% -44.47% 0.91% 26.15% -40.61% 17.91% 265.44% -44.03% -38.64% 2.86% 35.56% 108.82% -56.41% 39.91% -48.50% 254.92% -64.84% -7.71% 36.23% 46.03% -31.77% -13.44% 310.26% -108.61% -435.56% 3.85% 225.00% 280.95% -87.86% 30.08% 2560.00% -93.59% -80.05% 37.19% 14.46% -3.86% -15.91% -24.32% 39.38% -252.08% -147.64% 8.63% 78.37% 30.82% -52.54% 2.13% 95.24% 68.00% -69.88% -0.30% 80.98% 9100.00% -99.61% 11.93% 45.89% 79.55% -56.22% -12.61% 63.70% 88.59% -53.58% 47.93% 35.62% -0.62% -26.82% 4.27% 42.57%  
      operating margin %
    4.83% 11.53% 10.67% 7.75% 5.91% 1.34% 8.97% 10.21% 6.95% 7.25% 9.68% 9.42% 9.80% 5.72% 7.98% 5.79% 8.32% 10.78% 5.79% 10.05% 10.77% 8.85% 13.39% 11.38% 3.38% 6.18% 8.34% 8.19% 6.53% 3.20% 7.05% 5.11% 10.66% 3.33% 9.02% 9.95% 7.96% 6.03% 7.46% 8.31% 2.25% -24.91% 6.22% 6.02% 2.01% 0.49% 3.93% 3.73% 0.15% 2.28% 9.89% 7.68% 6.72% 6.91% 7.94% 9.90% 7.67% -4.98% 10.05% 9.43% 5.79% 5.17% 9.96% 10.03% 6.12% 3.70% 11.46% 11.42% 6.75% 0.07% 13.97% 12.28% 9.09% 5.39% 11.58% 12.78% 8.75% 5.27% 10.21% 7.28% 6.05% 6.14% 8.16% 7.92% 6.38% 
      other income
    900,000 2,400,000 700,000 2,100,000 1,400,000 1,200,000 100,000 100,000  200,000 200,000 200,000 -200,000 700,000 800,000 400,000 600,000 900,000 900,000 800,000 1,000,000 400,000 900,000 500,000 500,000 100,000  -100,000 600,000 1,800,000 -600,000 -700,000 200,000 700,000 600,000 700,000 2,000,000 700,000 200,000 400,000 1,600,000 -200,000  200,000 200,000 -75,000 -200,000 -300,000 200,000 700,000 1,300,000 1,000,000 500,000 200,000 600,000 400,000 700,000 100,000 400,000 100,000 100,000 100,000  100,000 1,700,000     1,700,000 -200,000 -300,000   200,000  100,000 -600,000 200,000 600,000 200,000 -200,000 100,000 200,000 400,000 
      interest expense
    15,000,000 15,500,000 16,700,000 17,300,000 16,600,000 18,300,000 20,200,000 20,600,000 17,100,000 17,700,000 19,000,000 20,300,000 14,000,000 12,500,000 11,400,000 11,100,000 9,800,000 10,000,000 10,200,000 10,100,000 10,200,000 10,300,000 11,800,000 12,800,000 14,000,000 14,300,000 15,500,000 16,000,000 16,700,000 16,200,000 15,100,000 14,500,000 10,500,000 10,600,000 10,500,000 10,800,000 10,600,000 12,500,000 11,700,000 14,300,000 12,300,000 12,200,000 12,600,000 12,900,000 13,000,000 13,800,000 11,900,000 6,600,000 6,800,000 6,600,000 6,700,000 6,600,000 6,900,000 7,100,000 6,900,000 7,000,000 6,900,000 6,900,000 6,700,000 6,700,000 6,900,000 6,700,000 6,600,000 6,900,000 6,900,000 6,100,000 10,000,000 10,000,000 10,200,000 8,700,000 10,700,000 10,600,000 10,800,000 11,200,000 11,300,000 12,000,000 11,700,000 11,700,000 11,700,000 11,600,000 26,900,000 14,100,000 12,900,000 12,800,000 12,500,000 
      loss on pension settlement
     -1,900,000   29,000,000                             2,200,000 8,800,000                                                   
      income before income taxes
    7,900,000 38,700,000 35,800,000 23,900,000 -17,200,000 21,000,000 29,600,000 37,000,000 17,400,000                 10,100,000 24,100,000 22,400,000 12,300,000 -800,000 15,500,000 7,100,000 33,000,000 2,300,000 24,800,000 27,500,000 5,700,000 7,100,000 16,200,000 18,100,000 -2,900,000 -103,000,000 14,400,000 13,300,000 -4,800,000 -11,400,000 5,200,000 6,400,000 -6,100,000 1,900,000 33,700,000 22,900,000 18,500,000 19,000,000 24,500,000 34,100,000 23,000,000 -26,000,000 34,000,000 30,500,000 14,000,000 9,300,000 26,900,000 26,000,000 11,600,000 -18,700,000 22,900,000 23,100,000 8,200,000                 
      income tax provision
    800,000 9,000,000 12,000,000 7,500,000 -3,300,000   10,200,000 4,400,000 6,700,000 8,300,000 9,900,000 9,900,000 1,900,000 13,200,000 6,800,000 9,700,000 12,100,000 4,800,000 9,100,000 8,500,000 6,200,000 8,600,000 8,000,000 -1,800,000 -10,100,000 3,600,000 8,000,000 -100,000 1,600,000 8,600,000 6,600,000 9,200,000 3,100,000 4,800,000 6,600,000  2,625,000 4,200,000 6,800,000  2,500,000 5,200,000                                           
      net income
    7,100,000 29,700,000 23,800,000 16,400,000 -13,900,000 -10,200,000 19,000,000 26,800,000 13,000,000 13,000,000 26,200,000 24,400,000 26,200,000 13,800,000 19,000,000 11,600,000 18,800,000 22,200,000 10,000,000 26,900,000 25,800,000 18,600,000 75,500,000 29,400,000 -2,500,000 20,200,000 20,400,000 14,400,000 12,400,000 -2,400,000 6,900,000 1,000,000 23,700,000 -13,800,000 19,900,000 19,800,000 4,600,000 6,300,000 11,900,000 11,300,000 -1,800,000 -88,800,000 9,100,000 7,900,000 -4,200,000 -35,800,000 -4,200,000 700,000 -100,000 -5,600,000 19,500,000 14,700,000 11,500,000 14,200,000 16,200,000 20,900,000 15,900,000 -14,000,000 22,700,000 19,900,000 9,000,000 5,200,000 15,800,000 16,100,000 7,400,000 -12,800,000 17,100,000 12,500,000 4,600,000 75,000,000 25,500,000 24,300,000 13,200,000 5,000,000 25,500,000 22,300,000 10,500,000 3,800,000 12,400,000 5,000,000 -6,000,000 500,000 4,600,000 4,200,000 600,000 
      yoy
    -151.08% -391.18% 25.26% -38.81% -206.92% -178.46% -27.48% 9.84% -50.38% -5.80% 37.89% 110.34% 39.36% -37.84% 90.00% -56.88% -27.13% 19.35% -86.75% -8.50% -1132.00% -7.92% 270.10% 104.17% -120.16% -941.67% 195.65% 1340.00% -47.68% -82.61% -65.33% -94.95% 415.22% -319.05% 67.23% 75.22% -355.56% -107.09% 30.77% 43.04% -57.14% 148.04% -316.67% 1028.57% 4100.00% 539.29% -121.54% -95.24% -100.87% -139.44% 20.37% -29.67% -27.67% -201.43% -28.63% 5.03% 76.67% -369.23% 43.67% 23.60% 21.62% -140.63% -7.60% 28.80% 60.87% -117.07% -32.94% -48.56% -65.15% 1400.00% 0.00% 8.97% 25.71% 31.58% 105.65% 346.00% -275.00% 660.00% 169.57% 19.05% -1100.00%     
      qoq
    -76.09% 24.79% 45.12% -217.99% 36.27% -153.68% -29.10% 106.15% 0.00% -50.38% 7.38% -6.87% 89.86% -27.37% 63.79% -38.30% -15.32% 122.00% -62.83% 4.26% 38.71% -75.36% 156.80% -1276.00% -112.38% -0.98% 41.67% 16.13% -616.67% -134.78% 590.00% -95.78% -271.74% -169.35% 0.51% 330.43% -26.98% -47.06% 5.31% -727.78% -97.97% -1075.82% 15.19% -288.10% -88.27% 752.38% -700.00% -800.00% -98.21% -128.72% 32.65% 27.83% -19.01% -12.35% -22.49% 31.45% -213.57% -161.67% 14.07% 121.11% 73.08% -67.09% -1.86% 117.57% -157.81% -174.85% 36.80% 171.74% -93.87% 194.12% 4.94% 84.09% 164.00% -80.39% 14.35% 112.38% 176.32% -69.35% 148.00% -183.33% -1300.00% -89.13% 9.52% 600.00%  
      net income margin %
    1.56% 6.86% 4.90% 3.25% -3.04% -2.14% 3.43% 4.76% 2.61% 2.53% 4.76% 4.23% 5.10% 2.86% 3.54% 2.31% 4.09% 5.48% 2.35% 6.10% 6.33% 4.73% 17.26% 6.73% -0.62% 5.14% 4.30% 3.07% 2.85% -0.56% 1.56% 0.23% 5.84% -3.77% 5.17% 5.24% 1.33% 2.01% 3.21% 2.93% -0.52% -24.42% 2.10% 1.83% -1.06% -8.39% -0.95% 0.20% -0.03% -1.64% 4.93% 3.96% 3.10% 3.79% 4.18% 5.08% 4.17% -3.63% 5.66% 5.06% 2.51% 1.69% 4.70% 4.92% 2.70% -4.74% 5.90% 4.29% 1.69% 25.96% 6.90% 6.47% 3.80% 1.53% 7.35% 6.19% 3.27% 1.34% 3.94% 1.68% -2.27% 0.19% 1.71% 1.58% 0.26% 
      earnings per common share:
                                                                                         
      basic
    360,000 1,500,000 1,210,000 830,000 -680,000 752,500 1,120,000 1,290,000 610,000                                 192,500 490,000 440,000 -160,000                430,000            630,000   1,080,000 510,000 180,000 600,000 240,000      
      diluted
    350,000 1,450,000 1,170,000 810,000 -680,000 730,000 1,090,000 1,250,000 590,000                                 190,000 490,000 440,000 -160,000                430,000            630,000   1,070,000 500,000 180,000 590,000 240,000      
      weighted-average shares outstanding
                                                                                         
      basic
    19,552,000,000 19,855,000,000 19,654,000,000 19,883,000,000 20,369,000,000 20,659,000,000 20,409,000,000 20,901,000,000 21,066,000,000 20,835,000,000 20,828,000,000 20,843,000,000 20,842,000,000 20,977,000,000 20,897,000,000 21,026,000,000 21,151,000,000 21,238,000,000 21,322,000,000 21,289,000,000 21,142,000,000 20,992,000,000 21,047,000,000 21,001,000,000 20,852,000,000 20,665,000,000 20,684,000,000 20,662,000,000 20,575,000,000 20,871,000,000 20,946,000,000 21,138,000,000 20,894,000,000 20,754,000,000 20,746,000,000 20,782,000,000 20,722,000,000 20,636,000,000 20,657,000,000 20,640,000,000 20,582,000,000 20,541,000,000 20,553,000,000 20,545,000,000 20,512,000,000 20,463,000,000 20,495,000,000 20,475,000,000 20,384,000,000 20,575,000,000 20,577,000,000 20,727,000,000 20,667,000,000 20,681,000,000 20,694,000,000 20,764,000,000 20,669,000,000 20,599,000,000 20,603,000,000 20,603,000,000 20,588,000,000 20,543,000,000 20,566,000,000 20,558,000,000 20,473,000,000 20,446,000,000 20,454,000,000 20,445,000,000 20,429,000,000 20,651,000,000 20,535,000,000 20,844,000,000 20,828,000,000 20,768,000,000 20,773,000,000 20,741,000,000 20,730,000,000 19,190,000,000 20,672,000,000 20,654,000,000      
      diluted
    20,122,000,000 20,405,000,000 20,212,000,000 20,235,000,000 20,369,000,000 21,291,000,000 20,961,000,000 21,559,000,000 21,909,000,000 21,539,000,000 21,659,000,000 21,351,000,000 21,385,000,000 21,313,000,000 21,085,000,000 21,239,000,000 21,692,000,000 21,925,000,000 21,947,000,000 21,967,000,000 21,907,000,000 21,374,000,000 21,380,000,000 21,068,000,000 21,315,000,000 21,068,000,000 21,030,000,000 21,044,000,000 20,881,000,000 21,326,000,000 21,700,000,000 22,054,000,000 22,158,000,000 22,000,000,000 21,911,000,000 21,883,000,000 21,746,000,000 21,055,000,000 21,163,000,000 20,944,000,000 20,582,000,000 20,541,000,000 20,632,000,000 20,640,000,000 20,512,000,000 20,463,000,000 20,603,000,000 20,582,000,000 20,588,000,000 20,815,000,000 20,801,000,000 20,945,000,000 20,925,000,000 20,927,000,000 20,900,000,000 20,959,000,000 20,903,000,000 20,833,000,000 20,746,000,000 20,739,000,000 20,724,000,000 20,676,000,000 20,648,000,000 20,643,000,000 20,632,000,000 20,561,000,000 20,584,000,000 20,542,000,000 20,479,000,000 20,767,000,000 20,617,000,000 20,923,000,000 20,901,000,000 20,874,000,000 20,883,000,000 20,865,000,000 20,845,000,000 20,104,000,000 20,800,000,000 20,821,000,000      
      loss on sale of assets
      -100,000   1,000,000 9,700,000                                                                               
      net loss attributable to noncontrolling interests
                 -50,000 -100,000 -100,000  -75,000 -200,000  -100,000                                                                 
      net income attributable to koppers
     29,700,000 23,800,000 16,400,000 -13,900,000 -10,200,000 22,800,000 26,800,000 13,000,000 12,900,000 26,300,000 24,500,000 25,500,000 13,800,000 19,100,000 11,700,000 18,800,000 22,200,000 10,200,000 26,900,000 25,900,000 18,600,000 75,600,000 29,200,000 -1,400,000 20,600,000 19,800,000 14,700,000 11,500,000 -2,600,000 7,600,000 600,000 17,800,000 -14,800,000 19,800,000 19,700,000 4,400,000 6,400,000 12,100,000 12,100,000 -1,300,000 -87,700,000 10,100,000 9,000,000 -3,400,000 -33,500,000 -2,700,000 1,600,000 2,200,000 -4,100,000 19,100,000 14,400,000 11,000,000 13,600,000 16,000,000 20,400,000 15,600,000 -14,200,000 22,400,000 19,800,000 8,900,000 5,100,000 15,600,000 16,100,000 7,300,000 -13,400,000 16,400,000 11,700,000 4,100,000                 
      earnings per common share attributable to koppers common shareholders:
                                                                                         
      basic
    360,000 1,500,000 1,210,000 830,000 -680,000 752,500 1,120,000 1,290,000 610,000                                 192,500 490,000 440,000 -160,000                430,000            630,000   1,080,000 510,000 180,000 600,000 240,000      
      diluted
    350,000 1,450,000 1,170,000 810,000 -680,000 730,000 1,090,000 1,250,000 590,000                                 190,000 490,000 440,000 -160,000                430,000            630,000   1,070,000 500,000 180,000 590,000 240,000      
      net income attributable to noncontrolling interests
          -3,800,000   100,000 -100,000 -100,000 700,000          -100,000 200,000 -1,100,000 -400,000 600,000 -300,000 900,000 200,000 -700,000 400,000 5,900,000 1,000,000 100,000 100,000 200,000 -100,000 -200,000 -800,000 -500,000 -1,100,000 -1,000,000 -1,100,000 -800,000 -2,300,000 -1,500,000 -900,000 -2,300,000 -1,500,000 400,000 300,000 500,000 600,000 200,000 500,000 300,000 200,000 300,000 100,000 100,000 100,000 200,000  100,000 600,000 700,000 800,000 500,000                 
      income tax expense
         6,300,000 10,600,000                                                                               
      other loss
            -100,000                                                         -125,000 -300,000 -200,000                  
      income from continuing operations before income taxes
             19,700,000 34,500,000 34,300,000 36,100,000 15,800,000 32,200,000 18,400,000 29,000,000 34,600,000 15,300,000 35,000,000 34,700,000 24,900,000 47,700,000 37,400,000 100,000                                                             
      income from continuing operations
             13,000,000 26,200,000 24,400,000 26,200,000 13,900,000 19,000,000 11,600,000 19,300,000 22,500,000 10,500,000 25,900,000 26,200,000 18,700,000 39,100,000 29,400,000 1,900,000 20,200,000 20,500,000 14,400,000 12,400,000 -2,400,000 6,900,000 500,000 23,800,000 -14,300,000 20,000,000 20,900,000 4,700,000 6,200,000 12,000,000 11,300,000 -2,400,000 -88,800,000 9,200,000 7,900,000  -36,400,000 -4,300,000 800,000 -100,000 -5,600,000 19,600,000 14,800,000 11,400,000 14,200,000 16,200,000 21,100,000 15,800,000 -14,000,000 22,700,000 19,900,000  5,200,000 15,800,000 16,300,000 7,400,000 -12,800,000 17,100,000 12,600,000 4,800,000 -11,400,000 24,600,000 22,300,000 13,200,000 5,000,000 18,800,000           
      loss on sale of discontinued operations
                                                                                         
      earnings per common share attributable to koppers common shareholders:
                                                                                         
      basic -
                                560,000    860,000                                                     
      continuing operations
             620,000 1,270,000 1,170,000 1,220,000 670,000 910,000 560,000 910,000 1,060,000 500,000 1,220,000 1,240,000 880,000 1,860,000 1,400,000 90,000 1,000,000 960,000 710,000  -120,000 360,000 10,000  -730,000 960,000 1,000,000 210,000 310,000 590,000 580,000 -90,000     -1,660,000 -140,000 80,000 110,000 -200,000 930,000 700,000 530,000 660,000 770,000 1,000,000 740,000 -690,000 1,080,000 960,000  240,000 760,000 790,000 360,000 -660,000 800,000 570,000 210,000 -540,000 1,210,000 1,060,000  240,000 910,000           
      discontinued operations
                 -10,000   -20,000 -30,000 -20,000 40,000 -20,000  1,730,000 -10,000 -160,000       20,000  20,000  -60,000     30,000           -10,000    -10,000 10,000       -10,000     -10,000 4,180,000 40,000 100,000   320,000           
      earnings per basic common share
             620,000 1,270,000 1,170,000 1,220,000 660,000 910,000 560,000 890,000 1,030,000 480,000 1,260,000 1,220,000 880,000 3,590,000 1,390,000 -70,000 1,000,000 960,000 710,000  -120,000 360,000 30,000  -710,000 960,000 940,000 210,000 310,000 590,000 580,000      -1,630,000 -140,000 80,000 110,000 -200,000 930,000 690,000 530,000 660,000 770,000 990,000 750,000 -690,000 1,080,000 960,000  240,000 760,000 780,000 360,000 -660,000 800,000 570,000 200,000 3,640,000 1,250,000 1,160,000  240,000 1,230,000           
      diluted -
                                550,000    810,000                                                     
      earnings per diluted common share
             600,000 1,220,000 1,150,000 1,190,000 660,000 910,000 550,000 870,000 1,010,000 470,000 1,220,000 1,180,000 830,000 3,530,000 1,390,000 -70,000 960,000 940,000 700,000  -90,000 350,000 30,000  -680,000 910,000 900,000 200,000 300,000 580,000 570,000      -1,630,000 -140,000 80,000 110,000 -190,000 920,000 690,000 530,000 640,000 770,000 980,000 750,000 -690,000 1,080,000 960,000  240,000 750,000 780,000 360,000 -660,000 800,000 570,000  3,620,000 1,240,000 1,160,000  240,000 1,220,000           
      comprehensive income
             17,675,000 18,100,000 18,700,000 33,900,000 -6,925,000 -9,500,000 -38,800,000 20,500,000 11,425,000 -17,400,000 31,400,000 31,800,000 31,475,000 103,300,000 73,700,000 -51,000,000 8,975,000 5,500,000 9,600,000 20,600,000 -1,625,000 -2,000,000 -20,700,000 16,200,000 18,425,000 36,800,000 24,700,000 12,300,000 7,850,000 14,100,000 9,900,000 7,200,000   11,100,000 -14,300,000 -3,525,000 -19,900,000 3,200,000 2,600,000 10,575,000 26,600,000 5,900,000 9,800,000 15,200,000 25,300,000 13,000,000 22,600,000                             
      comprehensive income attributable to noncontrolling interests
             100,000  -300,000 700,000     -50,000 -200,000   -25,000 900,000 200,000 -1,300,000 200,000 200,000 -600,000 1,100,000 1,175,000 -1,100,000 -300,000 6,100,000 150,000 200,000 200,000 200,000         -1,225,000 -1,300,000 -900,000 -2,700,000 375,000 800,000 200,000 500,000 250,000 300,000 500,000 300,000                             
      comprehensive income attributable to koppers
             17,575,000 18,100,000 19,000,000 33,200,000 -6,775,000 -9,100,000 -38,600,000 20,500,000 11,475,000 -17,200,000 31,400,000 31,900,000 31,500,000 102,400,000 73,500,000 -49,700,000 8,775,000 5,300,000 10,200,000 19,500,000 -2,800,000 -900,000 -20,400,000 10,100,000 18,275,000 36,600,000 24,500,000 12,100,000 8,275,000 14,300,000 10,900,000 7,700,000   12,200,000 -13,500,000 -2,300,000 -18,600,000 4,100,000 5,300,000 10,200,000 25,800,000 5,700,000 9,300,000 14,950,000 25,000,000 12,500,000 22,300,000                             
      impairment and restructuring charges
                      100,000 900,000 1,200,000 1,000,000 1,600,000 4,100,000 -200,000 800,000 1,100,000 3,800,000 300,000 200,000 900,000 1,400,000 1,500,000 10,400,000 2,200,000 2,100,000 1,500,000 4,000,000 5,000,000 6,000,000 5,100,000 39,500,000   2,700,000 -200,000 2,600,000  15,500,000                                     
      gain on sale of discontinued operations, net of tax benefit of 0.0, 0.2, 0.3 and 0.0
                 -125,000                                                                        
      comprehensive loss attributable to noncontrolling interests
                 -150,000 -400,000 -200,000     -100,000                 -425,000 -200,000 -1,000,000 -500,000 -775,000 -1,200,000 -1,100,000 -800,000                                         
      loss on sale of discontinued operations, net of tax benefit of 0.0, 0.1, (0.2) and 0.1
                                                                                         
      loss on sale of discontinued operations, net of tax benefit of 0.0 and 0.1
                    -500,000                                                                     
      gain on sale of assets
                     -1,950,000  -300,000 -7,500,000                                                                 
      income from discontinued operations, net of tax benefit of 0.0, 0.4, 0.0 and 1.4
                     25,000                                                                    
      gain on sale of discontinued operations, net of tax benefit of 0.2,
                      -500,000                                                                   
      income from discontinued operations, net of tax benefit of 0.1, 0.2, 0.1 and 1.0
                       500,000                                                                  
      gain on sale of discontinued operations
                       500,000                                                                  
      loss from discontinued operations, net of tax benefit of 0.1 and 0.8
                        -400,000                                                                 
      income from discontinued operations, net of tax benefit of 0.4,
                         -950,000 600,000                                                               
      gain on sale of discontinued operations, net of tax expense of 8.3
                          35,800,000                                                               
      income from discontinued operations, net of tax benefit of 0.2, 0.0, 1.0, and
                                                                                         
      income from discontinued operations, net of tax benefit of 0.8 and
                            -4,400,000                                                             
      income from discontinued operations, net of tax expense of 0.0, 0.0, 0.0, and
                             -25,000 -100,000                                                           
      income from discontinued operations, net of tax expense of 0.0, 0.3, 0.0, and 0.2
                                                                                         
      loss from discontinued operations, net of tax benefit of 0.0
                                    -100,000                                                     
      loss on extinguishment of debt
                                        13,300,000                                                 
      income from discontinued operations, net of tax benefit of 0.0, 0.0, (0.3) and 0.4
                                 100,000                                                        
      income from discontinued operations, net of tax benefit of (0.3), 0.6, (0.2) and 0.6
                                   500,000                                                      
      gain on sale of business
                                          -2,100,000      -3,200,000                                         
      income from discontinued operations, net of tax benefit
                                     -325,000 -100,000 -1,100,000                                                  
      income tax benefit
                                        1,000,000    -500,000   5,400,000                                          
      income from discontinued operations, net of tax expense of 0.0 and 0.2
                                        -100,000                                                 
      income from discontinued operations, net of tax expense of 0.0, 0.0, 0.3 and 0.0
                                         125,000 -100,000                                               
      income from discontinued operations, net of tax expense of 0.0, 0.0, 0.4 and 0.0
                                                                                         
      income from discontinued operations, net of tax expense of 0.2 and 0.0
                                            600,000                                             
      loss per basic common share
                                            -60,000                                             
      loss per diluted common share
                                            -60,000                                             
      income from discontinued operations, net of tax benefit of 0.0, 0.0, 0.0 and 0.0
                                             -25,000 -100,000                                           
      comprehensive loss
                                             -1,975,000 -4,700,000                                           
      comprehensive loss attributable to koppers
                                             -1,200,000 -3,500,000                                           
      dividends declared per common share
                                                 250,000 250,000 250,000 250,000 250,000 250,000 250,000 250,000 240,000 240,000 240,000 240,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 170,000 170,000 170,000 170,000 170,000 170,000 170,000 0.79     
      income from discontinued operations, net of tax benefit of 0.0, 0.1, 0.0 and 0.1
                                                  100,000                                       
      income taxes
                                                -600,000 25,000,000 9,500,000 5,600,000 -6,000,000 7,500,000 14,100,000 8,100,000 7,100,000 4,800,000 8,300,000 13,000,000 7,200,000 -12,000,000 11,300,000 10,600,000 5,000,000 4,100,000 11,100,000 9,700,000 4,200,000 -5,900,000 5,800,000 10,500,000 3,400,000 5,500,000 15,500,000 12,500,000 7,000,000 700,000 9,600,000 10,900,000 5,000,000 -1,100,000 7,100,000 4,900,000 -4,900,000 2,375,000 3,700,000 4,600,000 1,200,000 
      basic –
                                                                                         
      diluted –
                                                                                         
      income from discontinued operations, net of tax benefit of 0.1, 0.2, 0.1 and 0.1
                                                   -100,000                                      
      income from discontinued operations, net of tax expense of 0.0 and 0.1
                                                                                         
      income from discontinued operations, net of tax benefit of 0.1, 0.0, 0.1 and 0.2
                                                     -25,000 -100,000                                   
      income from discontinued operations, net of tax benefit of 0.2, 0.3, 0.1 and 0.1
                                                       -100,000                                  
      income from discontinued operations, net of tax expense of 0.1 and 0.1
                                                        100,000                                 
      income from discontinued operations, net of tax benefit (expense) of 0.0, (0.3), 0.2 and 0.6
                                                         -25,000                                
      income from discontinued operations, net of tax benefit of 0.2, 0.7, 0.1 and 0.9
                                                           -200,000                              
      income from discontinued operations, net of tax benefit of (0.1) and 0.2
                                                            100,000                             
      loss on sale of discontinued operations, net of tax benefit of 0.1
                                                                                         
      loss on sale of discontinued operations, net of tax benefit of 0.0, 0.1, 0.0 and 0.1
                                                                                         
      loss on sale of discontinued operations, net of tax benefit of 0.0, 0.0, 0.1 and 0.2
                                                                 -50,000                        
      loss on sale of discontinued operations, net of tax benefit of 0.1, 0.0, 0.1 and 0.2
                                                                   -200,000                      
      loss on sale of discontinued operations, net of tax benefit of 0.2
                                                                        -200,000                 
      income from discontinued operations, net of tax benefit of —, 1.0, — and 3.0
                                                                                         
      loss on sale of discontinued operations, net of tax benefit of —, —, 0.2 and —
                                                                     -75,000  -100,000                  
      income from discontinued operations, net of tax benefit of —,
                                                                                         
      income from discontinued operations, net of tax benefit of 1.1
                                                                                         
      income before interest expense, income taxes and minority interest
                                                                         32,225,000 51,400,000 45,800,000 31,600,000   46,000,000 28,200,000 14,800,000 32,300,000 22,300,000 16,200,000 14,650,000 22,100,000 21,300,000 15,200,000 
      income before income taxes and minority interest
                                                                         -6,800,000 40,700,000 35,200,000 20,800,000 6,400,000 29,100,000 34,000,000 16,500,000 3,100,000 20,600,000 10,700,000 -10,700,000 5,100,000 9,200,000 8,500,000 2,700,000 
      minority interest
                                                                         -900,000 600,000 400,000 600,000 700,000 700,000 800,000 1,000,000 400,000 1,100,000 800,000 200,000 600,000 900,000 -300,000 900,000 
      income from discontinued operations, net of tax benefit of
                                                                         500,000 900,000 2,000,000              
      gain on sale of discontinued operations, net of tax expense of —, 4.3, — and 4.3
                                                                                         
      earnings per common share:
                                                                                         
      income from discontinued operations, net of tax expense of 0.2
                                                                                         
      earnings per common share — continuing and discontinued operations:
                                                                                         
      basic
    360,000 1,500,000 1,210,000 830,000 -680,000 752,500 1,120,000 1,290,000 610,000                                 192,500 490,000 440,000 -160,000                430,000            630,000   1,080,000 510,000 180,000 600,000 240,000      
      diluted
    350,000 1,450,000 1,170,000 810,000 -680,000 730,000 1,090,000 1,250,000 590,000                                 190,000 490,000 440,000 -160,000                430,000            630,000   1,070,000 500,000 180,000 590,000 240,000      
      income from discontinued operations, net of tax expense of —, (0.1), 0.4 and 0.2
                                                                             25,000            
      gain on sale of koppers arch, net of tax expense of 4.3
                                                                              6,700,000           
      total operating expenses
                                                                               314,000,000 293,000,000 267,700,000 282,300,000 276,200,000 248,600,000 246,200,000 247,600,000 245,200,000 217,200,000 
      operating expenses:
                                                                                         
      dividends on preferred stock
                                                                                         
      net income applicable to common stock
                                                                                 2,850,000 12,400,000       
      earnings per share:
                                                                                         
      net income:
                                                                                         
      basic earnings per share
                                                                                    -0.41     
      diluted earnings per share
                                                                                    -0.41     
      weighted-average shares outstanding—basic
                                                                                    14.6 2.9    
      weighted-average shares outstanding—diluted
                                                                                    14.6 2.9    
    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 
                                                                                           
        assets
                                                                                           
        cash and cash equivalents
      42,800,000 38,000,000 37,900,000 38,400,000 33,300,000 43,900,000 44,500,000 48,900,000 49,000,000 66,500,000 53,500,000 48,200,000 46,400,000 33,300,000          33,000,000 54,200,000 33,000,000 40,700,000 42,100,000 38,100,000 40,600,000 62,500,000 62,500,000 52,200,000 60,300,000 50,200,000 40,000,000 23,400,000 20,800,000 17,700,000 16,400,000 15,600,000 21,800,000 33,000,000 51,200,000 25,800,000 51,100,000 75,100,000 54,400,000 54,700,000 82,200,000 72,400,000 63,200,000 56,700,000 66,700,000 68,900,000 50,300,000 42,600,000 54,100,000 59,200,000 53,600,000 40,500,000 35,300,000 33,100,000 18,100,000 23,500,000 58,400,000 130,900,000 110,000,000 76,200,000 63,100,000 12,600,000 9,200,000 11,000,000 17,500,000 20,600,000 26,200,000 17,700,000 24,400,000 28,900,000 23,900,000 25,400,000 26,100,000 36,500,000 37,800,000 39,000,000 
        accounts receivable
      181,000,000 158,700,000 192,100,000 211,700,000 204,800,000 191,800,000 238,000,000 224,100,000 218,300,000 202,400,000 241,700,000 258,300,000 241,600,000 215,700,000 232,800,000 229,500,000 223,500,000 182,800,000 198,500,000 205,500,000 194,700,000 175,100,000 195,100,000 189,200,000 176,800,000 163,900,000 180,700,000 212,800,000 188,100,000 189,700,000 220,800,000 216,000,000 212,400,000 159,200,000 180,500,000 180,100,000 166,500,000 136,800,000 171,300,000 174,700,000 168,600,000 155,000,000 198,500,000 204,800,000 190,800,000 198,700,000 229,500,000 159,900,000 157,300,000 157,900,000 182,100,000 166,600,000 174,300,000 162,700,000 172,900,000 193,500,000 191,200,000 160,900,000 179,500,000 187,600,000 171,500,000 128,900,000 144,100,000 142,900,000 133,100,000 102,500,000 121,200,000 118,100,000 111,900,000 112,100,000 160,300,000 194,100,000 176,900,000 148,000,000 162,500,000 168,600,000 158,200,000 142,100,000        
        inventories
      395,900,000 411,200,000 400,300,000 405,400,000 403,400,000 404,600,000 405,900,000 402,300,000 399,000,000 395,700,000 369,600,000 373,100,000 379,200,000 355,700,000 306,000,000 326,600,000 329,700,000 313,800,000 295,100,000 288,900,000 294,100,000 295,800,000 266,900,000 261,100,000 276,200,000 299,100,000 274,200,000 279,200,000 285,500,000 284,700,000 289,300,000 295,900,000 243,200,000 236,900,000 226,600,000 229,700,000 240,200,000 228,700,000 216,200,000 223,300,000 236,100,000 226,400,000 208,700,000 223,400,000 222,500,000 241,200,000 227,700,000 189,200,000 193,200,000 168,800,000 166,400,000 184,300,000 193,300,000 195,800,000 190,500,000 188,300,000 178,200,000 159,000,000 167,100,000 162,100,000 172,900,000 165,400,000 151,300,000 153,700,000 157,600,000 152,700,000 163,400,000 144,900,000 155,100,000 171,800,000 181,600,000 180,300,000 190,900,000 179,700,000 178,700,000 182,700,000 170,800,000 156,400,000 139,000,000       
        derivative contracts
      26,200,000 31,500,000 10,900,000 8,200,000 6,100,000 1,500,000 12,700,000 16,000,000 11,400,000 7,100,000 4,700,000 3,700,000 9,700,000 3,100,000 3,400,000 17,000,000 55,000,000 61,000,000 51,900,000 46,100,000 54,500,000 38,500,000                                                                
        other current assets
      23,000,000 29,300,000 41,600,000 44,300,000 44,200,000 38,800,000 29,000,000 30,100,000 30,000,000 27,300,000 30,000,000 30,200,000 33,700,000 29,000,000 23,800,000 27,900,000 26,800,000 25,000,000 23,800,000 22,800,000 21,500,000 15,400,000 36,200,000 18,100,000 26,000,000 21,600,000 21,700,000 21,500,000 29,100,000 22,500,000 31,500,000 33,200,000 39,900,000 48,600,000 53,000,000 46,700,000 40,300,000 39,100,000 30,200,000 32,000,000 27,000,000 27,000,000 39,200,000 33,900,000 31,500,000 30,300,000 39,600,000 28,600,000 31,400,000 35,700,000 25,600,000 31,500,000 28,000,000 29,800,000 23,200,000 19,700,000 20,200,000 21,800,000 23,700,000 27,100,000 22,100,000 23,000,000 21,400,000 18,400,000 17,800,000 17,400,000 15,400,000 15,800,000 13,600,000 16,900,000 13,400,000 14,600,000 20,400,000 22,400,000 7,000,000 9,400,000 11,500,000 11,500,000 6,200,000 8,100,000      
        total current assets
      668,900,000 668,700,000 682,800,000 708,000,000 691,800,000 680,600,000 730,100,000 721,400,000 707,700,000 699,000,000 699,500,000 713,500,000 710,600,000 636,800,000 608,800,000 641,400,000 684,200,000 628,100,000 614,200,000 609,800,000 609,000,000 564,500,000 539,000,000 573,100,000 604,900,000 519,500,000 517,600,000 557,400,000 543,300,000 540,300,000 605,600,000 609,300,000 549,700,000 506,700,000 514,000,000 501,000,000 476,800,000 438,100,000 445,000,000 461,300,000 464,700,000 444,300,000 502,300,000 538,200,000 495,300,000 541,300,000 608,000,000 462,900,000 469,600,000 473,100,000 472,200,000 471,500,000 476,700,000 481,200,000 479,800,000 473,800,000 454,700,000 427,400,000 435,400,000 438,200,000 422,900,000 370,400,000 380,400,000 360,500,000 361,600,000 381,000,000 438,000,000 391,500,000 363,900,000 372,400,000 417,700,000 436,400,000 419,800,000 388,200,000 383,900,000 402,000,000 373,300,000 349,500,000 346,200,000 335,500,000 300,200,000 290,900,000 306,500,000 306,800,000 308,500,000 
        property, plant and equipment, net of accumulated depreciation
      645,700,000  646,700,000 654,500,000 655,000,000  673,100,000 671,300,000 640,500,000  607,800,000                                                                           
        goodwill
      329,400,000 329,400,000 317,300,000 319,000,000 317,700,000 317,100,000 319,800,000 319,000,000 293,100,000 294,400,000 292,900,000 293,800,000 294,000,000 294,000,000 292,000,000 294,000,000 296,900,000 296,000,000 296,100,000 297,300,000 297,100,000 297,800,000 295,300,000 294,400,000 292,700,000 296,100,000 294,800,000 296,200,000 296,400,000 296,500,000 296,500,000 296,400,000 222,500,000 188,200,000 188,600,000 187,900,000 187,200,000 186,400,000 187,800,000 187,500,000 187,600,000 186,600,000 252,600,000 256,600,000 248,700,000 247,200,000 238,000,000 75,400,000 75,000,000 72,700,000 73,400,000 72,800,000 75,400,000 75,600,000 73,000,000 71,700,000 73,000,000 72,100,000 72,300,000 74,600,000 73,400,000 72,100,000 69,800,000 66,400,000 69,000,000 61,600,000 62,200,000 60,900,000 57,800,000 58,400,000 60,800,000 64,600,000 63,700,000 62,500,000 62,500,000 64,000,000 63,000,000 62,600,000 62,200,000 62,000,000 35,600,000 35,700,000 36,500,000 36,600,000 38,000,000 
        intangible assets
      103,100,000 106,700,000 107,600,000 111,500,000 115,200,000 119,000,000 123,200,000 127,200,000 98,500,000 102,200,000 105,200,000 108,900,000 112,400,000 116,100,000 119,100,000 123,500,000 128,100,000 131,500,000 135,600,000 140,000,000 144,600,000 149,800,000 153,500,000 157,800,000 161,700,000 168,400,000 172,400,000 178,100,000 183,000,000 188,000,000 193,500,000 198,700,000 145,100,000 129,600,000 133,500,000 136,200,000 139,000,000 141,900,000 146,500,000 149,900,000 153,500,000 156,100,000 158,900,000 165,200,000 169,100,000 167,700,000 180,100,000                                       
        operating lease right-of-use assets
      102,500,000 102,900,000 104,700,000 101,300,000 87,500,000 89,800,000 91,900,000 89,000,000 85,800,000 90,500,000 84,300,000 84,100,000 85,900,000 86,300,000 84,600,000 86,900,000 87,800,000 91,200,000 95,200,000 99,200,000 103,600,000 102,500,000 101,000,000 102,700,000 106,100,000 113,500,000 116,000,000 113,900,000 116,300,000                                                         
        deferred tax assets
      6,500,000 7,000,000 8,800,000 8,400,000 8,300,000 8,400,000 9,900,000 9,400,000 9,800,000 10,400,000 10,700,000 11,300,000 11,700,000 11,700,000 12,300,000 13,500,000 14,700,000 15,000,000 16,500,000 17,400,000 17,500,000 18,400,000 22,400,000 25,900,000 31,000,000 23,700,000 18,400,000 14,300,000 13,200,000 15,500,000 18,400,000 18,100,000 21,000,000 18,400,000 20,000,000 26,700,000 26,300,000 27,100,000 33,700,000 33,400,000 35,000,000 36,600,000 13,400,000 13,600,000 10,700,000 10,500,000 20,200,000 12,400,000 12,400,000 10,000,000 14,700,000 14,900,000 14,900,000 15,100,000 9,700,000 9,600,000 9,600,000 9,300,000 5,900,000 5,900,000 5,900,000 5,900,000 8,500,000 8,500,000 8,500,000 8,500,000 2,600,000 2,600,000 2,600,000 2,600,000                
        other assets
      24,200,000 21,200,000 26,900,000 28,100,000 15,300,000 14,500,000 11,600,000 10,700,000 9,900,000 7,300,000 9,800,000 9,200,000 10,000,000 9,200,000 8,700,000 9,200,000 10,400,000 11,000,000 23,300,000 25,000,000 25,800,000 24,600,000 43,100,000 32,600,000 21,300,000 28,000,000 24,800,000 23,800,000 23,900,000 21,700,000 23,200,000 24,700,000 24,800,000 29,300,000 12,500,000 13,200,000 14,200,000 13,200,000 10,600,000 9,500,000 10,100,000 24,000,000 25,100,000 26,000,000 25,200,000 25,200,000 25,000,000 31,500,000 32,700,000 26,200,000 27,300,000 28,000,000 29,800,000 29,100,000 21,200,000 25,000,000 25,800,000 26,400,000 27,700,000 29,300,000 26,700,000 27,700,000 25,900,000 26,100,000 26,100,000 21,900,000 19,200,000 21,600,000 23,000,000 23,500,000 22,300,000 23,200,000 23,800,000 25,300,000 31,000,000 28,700,000 29,200,000 29,700,000   25,900,000 31,100,000 31,000,000 31,000,000 27,400,000 
        total assets
      1,880,300,000 1,886,800,000 1,894,800,000 1,930,800,000 1,890,800,000 1,890,200,000 1,959,600,000 1,948,000,000 1,845,300,000 1,835,500,000 1,810,200,000 1,815,700,000 1,800,600,000 1,711,400,000 1,652,700,000 1,687,300,000 1,731,800,000 1,661,900,000 1,652,200,000 1,674,000,000 1,648,900,000 1,598,600,000 1,534,400,000 1,555,800,000 1,573,100,000 1,564,600,000 1,553,400,000 1,598,100,000 1,593,400,000 1,479,900,000 1,535,600,000 1,531,700,000 1,316,000,000 1,200,200,000 1,180,900,000 1,168,400,000 1,133,100,000 1,087,500,000 1,100,800,000 1,120,800,000 1,129,700,000 1,125,400,000 1,237,400,000 1,290,100,000 1,243,800,000 1,293,900,000 1,353,900,000 806,000,000 801,200,000 784,900,000 761,100,000 762,500,000 774,200,000 780,000,000 766,800,000 765,200,000 754,100,000 730,700,000 729,200,000 761,100,000 722,000,000 669,200,000 657,000,000 631,900,000 640,400,000 644,400,000 729,500,000 682,400,000 650,100,000 661,100,000 684,500,000 721,000,000 700,000,000 669,300,000 676,200,000 699,200,000 671,200,000 649,400,000 636,900,000 625,000,000 555,800,000 551,800,000 570,000,000 577,600,000 578,800,000 
        liabilities
                                                                                           
        accounts payable
      143,400,000 122,400,000 156,300,000 168,700,000 148,200,000 179,100,000 169,500,000 184,000,000 195,200,000 202,900,000 205,600,000 195,000,000 219,200,000 207,400,000 187,100,000 197,900,000 189,600,000 171,900,000 159,900,000 149,300,000 141,000,000 154,100,000 127,600,000 131,100,000 155,600,000 169,900,000 125,200,000 142,100,000 143,100,000 177,200,000 166,200,000 174,400,000 148,000,000 141,900,000 133,200,000 148,400,000 137,200,000 144,200,000 141,900,000 146,000,000 149,200,000 140,800,000 151,600,000 170,800,000 142,900,000 120,600,000 122,400,000 93,100,000 91,800,000 107,600,000 94,900,000 101,400,000 100,000,000 103,500,000 109,300,000 113,200,000 96,600,000 102,100,000 96,800,000 103,900,000 100,100,000 87,900,000 85,700,000 88,800,000 82,700,000 67,300,000 78,800,000 64,200,000 68,300,000 82,100,000 86,700,000 106,800,000 112,000,000 109,300,000 100,000,000 110,600,000 101,800,000 100,500,000 95,900,000 101,400,000 79,100,000 77,500,000 73,500,000 73,200,000 74,100,000 
        accrued liabilities
      70,100,000 72,600,000 71,300,000 72,000,000 82,400,000 115,100,000 86,800,000 72,100,000 87,500,000 95,100,000 80,900,000 73,400,000 75,900,000 96,100,000 87,300,000 84,500,000 88,800,000 90,500,000 80,700,000 87,000,000 94,500,000 106,700,000 109,200,000 96,100,000 100,900,000 94,000,000 106,500,000 98,900,000 99,500,000 109,900,000 101,700,000 110,000,000 109,800,000 127,900,000 108,200,000 116,400,000 101,100,000 106,300,000 102,400,000 102,200,000 99,600,000 99,800,000 97,700,000 95,300,000 107,400,000 122,500,000 102,600,000 73,200,000 83,400,000 82,400,000 66,300,000 56,400,000 70,900,000 72,100,000 70,900,000 56,100,000 60,900,000 63,100,000 59,700,000 64,900,000 59,300,000 55,400,000 57,600,000 45,800,000 54,000,000 59,800,000 71,300,000 63,800,000 61,700,000 61,800,000 69,000,000 69,400,000 73,600,000 64,800,000 79,300,000 69,700,000 72,200,000 63,600,000 78,400,000 61,600,000 63,800,000 71,200,000 71,600,000 57,000,000 63,400,000 
        current operating lease liabilities
      28,100,000 27,200,000 27,300,000 26,700,000 26,700,000 26,700,000 25,700,000 23,800,000 22,200,000 22,900,000 22,400,000 21,700,000 20,900,000 20,500,000 19,400,000 20,900,000 21,400,000 21,300,000 21,600,000 21,800,000 21,800,000 21,200,000 21,000,000 21,000,000 21,500,000 22,100,000 22,100,000 22,000,000 22,200,000                                                         
        current maturities of long-term debt
      4,900,000 4,900,000 4,900,000 4,900,000 4,900,000 4,900,000 5,000,000 5,000,000 4,000,000 5,000,000 4,000,000 4,000,000      2,000,000 4,600,000 7,100,000 9,600,000 10,100,000 13,700,000 10,200,000 10,200,000 10,200,000 10,300,000 14,000,000 11,600,000 11,600,000 15,100,000 15,300,000 7,900,000 11,400,000 12,800,000 12,500,000 11,900,000 42,600,000 39,500,000 40,100,000 42,400,000 39,900,000 45,100,000 45,400,000 44,700,000 43,900,000 30,000,000                                       
        total current liabilities
      246,500,000 227,100,000 259,800,000 272,300,000 262,200,000 325,800,000 287,000,000 284,900,000 308,900,000 325,900,000 312,900,000 294,100,000 316,000,000 324,000,000 293,800,000 303,300,000 299,800,000 285,700,000 266,800,000 265,200,000 266,900,000 292,100,000 271,500,000 292,800,000 322,800,000 296,200,000 264,100,000 277,000,000 276,400,000 298,700,000 283,000,000 299,700,000 265,700,000 281,200,000 254,200,000 277,300,000 250,200,000 293,100,000 283,800,000 288,300,000 291,200,000 280,500,000 294,400,000 311,500,000 296,700,000 292,100,000 260,100,000 171,400,000 180,300,000 195,100,000 167,000,000 163,600,000 176,700,000 181,200,000 185,800,000 174,900,000 163,100,000 170,400,000 161,700,000 192,900,000 164,700,000 149,400,000 148,600,000 139,900,000 141,400,000 131,800,000 342,300,000 132,700,000 134,700,000 148,600,000 181,600,000 199,800,000 202,500,000 198,900,000 197,600,000 206,000,000 196,800,000 187,200,000 197,900,000 195,800,000 150,400,000 159,200,000 186,300,000 161,900,000 161,600,000 
        long-term debt
      915,300,000 914,300,000 918,300,000 962,900,000 975,900,000 925,900,000 975,900,000 986,700,000 865,100,000 835,400,000 859,800,000 902,200,000 881,000,000 817,700,000 818,700,000 833,700,000 829,400,000 781,500,000 802,600,000 799,100,000 801,000,000 765,800,000 796,100,000 896,900,000 943,000,000 891,000,000 948,800,000 993,200,000 1,001,100,000 978,800,000 1,029,800,000 984,800,000 782,900,000 665,600,000 688,000,000 680,400,000 696,100,000 619,800,000 642,000,000 670,600,000 683,700,000 694,900,000 718,000,000 748,800,000 770,900,000 806,600,000 837,500,000 358,400,000 340,000,000 303,100,000 296,400,000 301,400,000 296,200,000 296,100,000 297,400,000 314,300,000 314,300,000 302,100,000 310,600,000 310,000,000 319,900,000 295,400,000 295,900,000 309,700,000 314,600,000 335,100,000 200,800,000 383,500,000 379,500,000 374,700,000 437,700,000 433,400,000 432,700,000 418,900,000 428,100,000 454,800,000 458,600,000 456,300,000 451,700,000 445,800,000      
        operating lease liabilities
      74,600,000 76,100,000 77,700,000 75,000,000 61,700,000 64,400,000 66,000,000 65,200,000 63,400,000 67,400,000 61,800,000 62,500,000 65,400,000 66,300,000 66,200,000 67,000,000 66,900,000 70,300,000 73,800,000 77,500,000 81,900,000 81,300,000 80,500,000 83,100,000 86,400,000 92,600,000 94,800,000 92,700,000 94,900,000                                                         
        accrued postretirement benefits
      13,100,000  12,900,000 13,100,000 13,900,000  25,300,000 27,600,000 27,900,000  34,900,000 35,300,000 35,100,000  36,700,000 37,400,000 38,100,000 38,600,000 44,600,000 45,300,000 45,800,000 46,200,000 46,200,000 46,400,000 46,500,000 46,600,000 48,700,000 48,600,000 48,400,000 48,200,000 46,600,000 46,500,000 46,400,000 46,300,000 41,300,000 50,400,000 51,000,000 51,600,000 51,500,000 52,000,000 53,000,000 53,600,000 52,600,000 54,100,000 53,800,000 54,700,000 27,700,000 31,000,000 37,200,000 41,600,000 71,500,000 77,200,000 83,300,000 89,900,000 91,900,000 97,100,000 104,800,000 104,100,000 76,500,000 83,000,000 85,600,000 86,100,000 80,800,000 81,600,000 82,000,000 81,900,000 78,700,000 78,100,000 76,500,000 75,700,000    27,800,000    50,400,000        
        deferred tax liabilities
      43,900,000 43,700,000 36,800,000 36,200,000 35,100,000 25,900,000 27,300,000 28,900,000 28,100,000 25,900,000 22,900,000 22,000,000 23,200,000 21,500,000 20,700,000 24,100,000 32,000,000 33,400,000 20,300,000 25,300,000 24,800,000 21,300,000 7,000,000 6,700,000 6,400,000 7,400,000 6,200,000 6,900,000 6,800,000 6,800,000 6,800,000 6,800,000 7,500,000 7,300,000 7,100,000 6,700,000 6,400,000 6,300,000 6,000,000 6,000,000 6,000,000 5,700,000 8,900,000 9,500,000 9,000,000 10,200,000 20,600,000 15,900,000 15,200,000 14,700,000                                    
        other long-term liabilities
      37,400,000 37,600,000 43,400,000 44,200,000 43,700,000 44,300,000 45,500,000 41,400,000 42,000,000 46,300,000 41,900,000 43,000,000 45,000,000 44,200,000 44,200,000 42,600,000 42,600,000 41,600,000 43,600,000 45,500,000 47,600,000 45,900,000 47,600,000 43,600,000 58,800,000 72,100,000 78,800,000 76,700,000 75,800,000 80,400,000 90,000,000 91,800,000 94,900,000 94,000,000 77,200,000 80,100,000 79,800,000 82,100,000 92,800,000 95,900,000 100,100,000 103,100,000 88,200,000 87,300,000 47,000,000 46,400,000 43,000,000 40,700,000 42,100,000 40,600,000 41,500,000 43,200,000 45,300,000 44,700,000 40,900,000 44,100,000 46,700,000 46,900,000 38,400,000 38,700,000 38,800,000 38,400,000 35,000,000 37,000,000 39,700,000 40,800,000 35,300,000 36,200,000 36,100,000 36,100,000 59,300,000 61,900,000 62,400,000 37,600,000 74,800,000 82,700,000 86,000,000 35,700,000 73,000,000 78,400,000 77,200,000 49,600,000    
        total liabilities
      1,330,800,000 1,312,500,000 1,348,900,000 1,403,700,000 1,392,500,000 1,401,200,000 1,427,000,000 1,434,700,000 1,335,400,000 1,332,500,000 1,334,200,000 1,359,100,000 1,365,700,000 1,308,400,000 1,280,300,000 1,308,100,000 1,308,800,000 1,251,100,000 1,251,700,000 1,257,900,000 1,268,000,000 1,252,600,000 1,248,900,000 1,369,500,000 1,463,900,000 1,405,900,000 1,441,400,000 1,495,100,000 1,503,400,000 1,412,900,000 1,456,200,000 1,429,600,000 1,197,400,000 1,094,400,000 1,067,800,000 1,094,900,000 1,083,500,000 1,052,900,000 1,076,100,000 1,112,800,000 1,134,000,000 1,137,800,000 1,162,100,000 1,211,200,000 1,177,400,000 1,210,000,000 1,188,900,000 617,400,000 614,800,000 595,100,000 576,400,000 585,400,000 601,500,000 611,900,000 616,000,000 630,400,000 628,900,000 623,500,000 587,200,000 624,600,000 609,000,000 569,300,000 560,300,000 568,200,000 577,700,000 589,600,000 657,100,000 630,500,000 626,800,000 635,100,000 678,600,000 695,100,000 697,600,000 683,200,000 700,500,000 743,500,000 741,400,000 729,600,000 722,600,000 720,000,000 655,800,000 746,500,000 756,500,000 734,900,000 737,100,000 
        commitments and contingent liabilities
                                                                                           
        equity
                                                                                           
        senior convertible preferred stock, 0.01 par value per share...
                                                                                           
        common stock, 0.01 par value per share...
      300,000 300,000 300,000 300,000 300,000 300,000 300,000 300,000 300,000 300,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000      
        additional paid-in capital
      336,400,000 332,400,000 329,000,000 326,100,000 324,100,000 317,200,000 311,700,000 306,100,000 300,000,000 291,100,000 280,100,000 273,700,000 269,200,000 263,900,000 260,500,000 257,000,000 253,400,000 249,500,000 246,200,000 242,700,000 238,900,000 234,100,000 231,200,000 228,000,000 224,700,000 221,900,000 215,900,000 212,400,000 209,000,000 206,000,000 202,300,000 198,700,000 194,700,000 190,600,000 186,500,000 183,700,000 180,700,000 176,500,000 173,800,000 171,200,000 169,000,000 167,800,000 167,500,000 166,300,000 165,100,000 164,500,000 164,500,000 163,000,000 160,100,000 158,900,000 158,800,000 156,700,000 155,200,000 153,300,000 149,100,000 146,900,000 145,100,000 142,900,000 141,200,000 139,700,000 138,200,000 137,000,000 135,800,000 135,100,000 134,100,000 127,200,000 127,200,000 127,300,000 126,900,000 126,600,000 125,600,000 125,500,000 124,700,000 124,400,000 124,500,000 122,900,000 122,400,000 122,400,000        
        retained earnings
      544,300,000 539,400,000 511,400,000 489,300,000 474,500,000 490,300,000 502,000,000 480,700,000 455,400,000 444,000,000 432,400,000 407,300,000 384,200,000 360,200,000 347,400,000 329,300,000 318,700,000 300,900,000 278,800,000 268,800,000 241,900,000 215,800,000 197,200,000 121,600,000 92,400,000 93,800,000 73,300,000 53,500,000 38,800,000 27,200,000 29,800,000 22,200,000 21,600,000 7,400,000 19,000,000       -54,000,000 33,800,000 23,700,000 14,700,000 18,000,000 56,700,000 64,700,000 68,300,000 71,300,000 80,600,000 66,800,000 57,700,000 52,000,000 43,500,000 32,500,000 17,200,000 6,700,000 25,500,000 7,800,000                          
        accumulated other comprehensive loss
      -65,800,000 -61,400,000 -63,300,000 -61,200,000 -83,300,000 -120,600,000 -84,500,000 -91,100,000 -95,300,000 -88,800,000 -103,300,000 -95,100,000 -89,600,000 -97,300,000 -116,700,000 -88,700,000 -38,300,000 -40,000,000 -33,000,000 -5,500,000 -10,000,000 -15,900,000 -55,100,000 -81,800,000 -126,100,000 -77,700,000 -98,100,000 -83,700,000 -79,200,000 -87,200,000 -73,700,000 -65,100,000 -44,200,000 -40,100,000 -39,300,000 -56,100,000 -60,900,000 -68,600,000 -69,600,000 -71,800,000 -70,800,000 -79,800,000 -80,800,000 -67,100,000 -70,500,000 -60,300,000 -20,400,000 -4,600,000 -7,000,000 -10,200,000 -25,800,000 -32,500,000 -23,800,000 -22,000,000 -22,500,000 -31,400,000 -23,500,000 -30,200,000 -12,100,000  -4,600,000 -12,300,000 -13,700,000 -34,600,000 -23,600,000  -22,500,000 -29,600,000 -50,400,000        -4,100,000 -6,500,000        
        treasury stock
      -265,700,000 -236,700,000 -231,800,000 -227,700,000 -217,600,000 -198,500,000 -197,200,000 -186,800,000 -154,600,000 -147,700,000 -137,400,000 -133,500,000 -133,400,000 -127,600,000 -122,500,000 -122,500,000 -115,100,000 -104,000,000 -95,800,000 -94,400,000 -94,300,000 -92,500,000 -92,100,000 -92,100,000 -92,100,000 -90,900,000 -90,900,000 -90,800,000 -90,800,000 -90,000,000 -89,800,000 -65,600,000 -65,600,000 -58,200,000 -58,100,000 -58,100,000 -54,300,000 -53,000,000 -53,000,000 -53,000,000 -53,000,000 -52,700,000 -52,700,000 -52,700,000 -52,700,000 -52,400,000 -52,400,000 -52,400,000 -52,400,000 -50,400,000 -50,400,000 -34,600,000 -34,600,000 -32,900,000 -32,900,000 -26,500,000 -26,500,000 -24,800,000 -24,800,000 -24,800,000 -24,800,000 -24,500,000 -24,500,000 -24,500,000 -24,500,000 -23,600,000 -23,600,000 -23,600,000 -23,600,000 -23,600,000 -22,200,000 -3,200,000 -2,400,000 -2,300,000 -2,300,000 -1,400,000 -1,400,000 -1,400,000 -1,400,000 -1,000,000 -1,000,000 -1,000,000 -1,000,000 -1,500,000 -1,300,000 
        total koppers shareholders’ equity
      549,500,000 574,000,000 545,600,000 526,800,000 498,000,000 488,700,000 532,300,000 509,200,000 505,800,000 498,900,000 472,000,000 452,600,000 430,600,000 399,400,000 368,900,000 375,300,000 418,900,000 406,600,000 396,400,000 411,800,000 376,700,000 341,700,000 281,400,000 175,900,000 99,100,000 147,300,000 100,400,000 91,600,000 78,000,000 56,200,000 68,800,000 90,400,000 106,700,000 99,900,000 108,300,000 68,900,000 45,200,000 30,400,000 20,300,000 3,400,000   68,000,000 70,400,000 56,800,000 70,000,000 148,600,000 170,900,000 169,200,000 169,800,000 163,400,000 156,600,000 154,700,000 150,600,000 137,400,000 121,700,000 112,500,000 94,800,000 130,000,000                           
        noncontrolling interests
       300,000 300,000 300,000 300,000 300,000 300,000 4,100,000 4,100,000 4,100,000 4,000,000 4,000,000 4,300,000 3,600,000 3,500,000 3,900,000 4,100,000 4,200,000 4,100,000 4,300,000 4,200,000 4,300,000 4,100,000 10,400,000 10,100,000 11,400,000 11,600,000 11,400,000 12,000,000 10,800,000 10,600,000 11,700,000 11,900,000 5,900,000 4,800,000 4,600,000 4,400,000 4,200,000 4,400,000 4,600,000 5,600,000 6,100,000 7,300,000 8,500,000 9,600,000 13,900,000 16,400,000 17,700,000 17,200,000 20,000,000 21,300,000 20,500,000 18,000,000 17,500,000 13,400,000 13,100,000 12,700,000 12,400,000 12,000,000 11,600,000 11,400,000 11,200,000 11,000,000 10,600,000 11,100,000 11,000,000 10,400,000 8,800,000 8,500,000                 
        total equity
      549,500,000 574,300,000 545,900,000 527,100,000 498,300,000 489,000,000 532,600,000 513,300,000 509,900,000 503,000,000 476,000,000 456,600,000 434,900,000 403,000,000 372,400,000 379,200,000 423,000,000 410,800,000 400,500,000 416,100,000 380,900,000 346,000,000 285,500,000 186,300,000 109,200,000 158,700,000 112,000,000 103,000,000 90,000,000 67,000,000 79,400,000 102,100,000 118,600,000 105,800,000 113,100,000 73,500,000 49,600,000 34,600,000 24,700,000 8,000,000   75,300,000 78,900,000 66,400,000 83,900,000 165,000,000 188,600,000 186,400,000 189,800,000 184,700,000 177,100,000 172,700,000 168,100,000 150,800,000 134,800,000 125,200,000 107,200,000 142,000,000 136,500,000 113,000,000 99,900,000 96,700,000 63,700,000 62,700,000 54,800,000 72,400,000 51,900,000 23,300,000                 
        total liabilities and equity
      1,880,300,000 1,886,800,000 1,894,800,000 1,930,800,000 1,890,800,000 1,890,200,000 1,959,600,000 1,948,000,000 1,845,300,000 1,835,500,000 1,810,200,000 1,815,700,000 1,800,600,000 1,711,400,000 1,652,700,000 1,687,300,000 1,731,800,000 1,661,900,000 1,652,200,000 1,674,000,000 1,648,900,000 1,598,600,000 1,534,400,000 1,555,800,000 1,573,100,000 1,564,600,000 1,553,400,000 1,598,100,000 1,593,400,000 1,479,900,000 1,535,600,000 1,531,700,000 1,316,000,000 1,200,200,000 1,180,900,000 1,168,400,000 1,133,100,000 1,087,500,000 1,100,800,000 1,120,800,000   1,237,400,000 1,290,100,000 1,243,800,000 1,293,900,000 1,353,900,000 806,000,000 801,200,000 784,900,000 761,100,000 762,500,000 774,200,000 780,000,000 766,800,000 765,200,000 754,100,000 730,700,000 729,200,000 761,100,000 722,000,000 669,200,000 657,000,000 631,900,000 640,400,000 644,400,000 729,500,000 682,400,000 650,100,000                 
        property, plant and equipment
       650,900,000    660,800,000    631,700,000  594,900,000 576,000,000 557,300,000 527,200,000 518,800,000 509,700,000 489,100,000 460,900,000 443,000,000 416,600,000 409,100,000 380,100,000 369,300,000 355,400,000 415,400,000 409,400,000 414,400,000 417,300,000 417,900,000 398,400,000 384,500,000 352,900,000 328,000,000 312,300,000 303,400,000 289,600,000 280,800,000 277,200,000 279,200,000 278,800,000 277,800,000 289,400,000 291,900,000 294,000,000 299,700,000 286,800,000 215,300,000 202,500,000 197,000,000 169,400,000 161,200,000 160,400,000 161,100,000 152,400,000 150,600,000 153,700,000 155,600,000 168,800,000 172,400,000 168,800,000 168,200,000 155,000,000 149,600,000 154,600,000 149,300,000 144,900,000 144,100,000 141,800,000 144,800,000 148,100,000 148,900,000 155,100,000 155,700,000 151,700,000 156,600,000 157,500,000 159,300,000 536,500,000 525,300,000      
        accrued post-retirement benefits
       13,700,000    14,900,000    31,600,000    34,700,000                                                                        
        cash and cash equivalents, including restricted cash
                    42,800,000 40,400,000 49,200,000 45,500,000 44,900,000 46,500,000 44,200,000 38,500,000 39,500,000                                                               
        non-current derivative contracts
                        10,400,000 42,300,000 34,700,000 31,900,000                                                                
        income tax receivable
                           1,200,000 1,300,000 3,600,000 4,200,000 1,900,000 300,000 1,800,000 2,500,000 2,800,000 1,500,000 1,700,000 2,000,000 1,700,000 3,700,000 4,500,000 6,400,000 3,800,000 100,000 5,400,000 7,900,000 4,600,000  1,800,000 4,500,000  6,400,000 8,900,000 11,100,000 9,000,000    1,600,000 2,900,000 700,000 1,200,000 10,600,000  1,900,000 10,000,000 11,900,000 22,000,000 18,900,000 21,100,000 37,100,000                    
        assets of discontinued operations held for sale
                             68,100,000 67,500,000                                              22,800,000 17,500,000              
        non-current assets of discontinued operations held for sale
                                                                                           
        liabilities of discontinued operations held for sale
                             34,400,000 34,600,000                                              8,400,000 7,000,000              
        non-current liabilities of discontinued operations held for sale
                                                                                           
        loan to related party
                                           8,900,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 9,500,000 11,700,000 11,700,000 11,700,000 11,700,000                            
        accumulated deficit
                                         -800,000 -20,500,000 -24,700,000 -31,100,000 -43,200,000 -55,300,000                                             
        total koppers shareholders’ deficit
                                              -9,900,000                                             
        total deficit
                                              -4,300,000                                             
        total liabilities and deficit
                                              1,129,700,000                                             
        dividends payable
                                                  1,700,000 5,100,000 5,100,000 5,100,000 5,100,000 5,100,000 5,800,000 5,800,000 5,800,000 5,600,000 5,600,000 5,600,000 5,600,000 5,200,000 5,200,000 5,200,000 5,200,000 5,100,000 5,100,000 5,100,000 4,500,000 4,500,000 4,500,000 4,500,000 4,500,000 4,500,000 4,500,000 4,600,000 4,600,000 3,500,000 3,500,000 3,500,000 3,500,000 3,500,000 3,500,000 3,500,000      
        total koppers shareholders’ (deficit) equity
                                               -18,500,000                                            
        total (deficit) equity
                                               -12,400,000                                            
        total liabilities and (deficit) equity
                                               1,125,400,000                                            
        equity in non-consolidated investments
                                                800,000 3,900,000 4,500,000 5,000,000 5,700,000 6,200,000 6,700,000 6,600,000 6,200,000 6,200,000 6,100,000 5,800,000 5,900,000 5,700,000 5,400,000 4,900,000 4,900,000 23,700,000 4,700,000 4,700,000 4,600,000 4,700,000 4,700,000 4,700,000 5,300,000 5,700,000 6,500,000 6,000,000 5,700,000 5,800,000 4,100,000 4,200,000 4,700,000 2,800,000 2,200,000 2,700,000 2,900,000 3,100,000 3,000,000 3,000,000 2,900,000 2,900,000 3,100,000 
        restricted cash
                                                        1,500,000 1,500,000                 4,200,000 4,200,000                
        short-term debt and current portion of long-term debt
                                                                  100,000 1,000,000 200,000 200,000 200,000 200,000 187,700,000 200,000 200,000 200,000 13,000,000 12,000,000 12,300,000 21,300,000 14,800,000 22,200,000 19,300,000 19,600,000 20,100,000 29,300,000      
        related party guarantee obligation
                                                                 18,900,000                          
        accumulated other comprehensive income
                                                                 2,000,000      -22,700,000    -47,400,000 1,700,000 24,700,000 19,500,000 12,600,000 4,100,000 1,400,000          
        total koppers stockholders’ equity
                                                                 124,900,000 101,600,000 88,700,000 85,700,000 53,100,000 51,600,000 43,800,000 62,000,000 43,100,000 14,800,000                 
        retained deficit
                                                                  -7,400,000 -11,700,000 -12,100,000 -23,100,000 -34,600,000 -37,300,000 -19,300,000 -31,200,000 -38,300,000 -37,800,000 -108,300,000 -129,300,000 -149,000,000 -157,600,000 -159,000,000 -180,900,000 -199,700,000 -206,500,000 -206,700,000 -215,600,000      
        short-term investments
                                                                       4,400,000 4,500,000 100,000 300,000 1,700,000 8,500,000 2,200,000 2,100,000 2,100,000            
        current assets:
                                                                                           
        current liabilities:
                                                                                           
        minority interest
                                                                           8,000,000 8,900,000 8,000,000 10,000,000 9,400,000 8,800,000 14,100,000 13,000,000 12,200,000 11,700,000 13,000,000 12,200,000 12,000,000 12,000,000 11,100,000 11,400,000 
        stockholders’ equity
                                                                                           
        receivable from director for purchase of common stock
                                                                              -600,000 -600,000 -600,000 -600,000 -600,000 -600,000 -600,000 -600,000 -600,000 -600,000 -600,000 -600,000 -600,000 
        total stockholders’ equity
                                                                           18,000,000  17,900,000              
        total liabilities and stockholders’ equity
                                                                           661,100,000  721,000,000            577,600,000 578,800,000 
        deferred tax benefit
                                                                            18,500,000 18,500,000 18,500,000 18,500,000 15,100,000 15,100,000 15,100,000 15,100,000   18,400,000 18,400,000 13,300,000 10,300,000 10,300,000 
        stockholders’ deficit
                                                                                           
        total stockholders’ deficit
                                                                            -3,000,000  -7,600,000 -23,300,000 -33,100,000 -58,400,000 -83,200,000 -92,400,000 -97,400,000 -108,000,000      
        total liabilities and stockholders’ deficit
                                                                            684,500,000  700,000,000 669,300,000 676,200,000 699,200,000 671,200,000 649,400,000 636,900,000 625,000,000      
        commitments and contingencies
                                                                                           
        accounts receivable less allowance for doubtful accounts of 0.7 in 2006 and 0.7 in 2005
                                                                                    153,700,000 145,400,000      
        deferred income tax benefits
                                                                                    18,400,000 18,400,000      
        accumulated depreciation
                                                                                    -382,200,000       
        net property, plant and equipment
                                                                                    154,300,000 151,500,000      
        other noncurrent assets
                                                                                    31,000,000 32,300,000      
        liabilities and stockholders’ deficit
                                                                                           
        stockholders’ deficit:
                                                                                           
        capital in excess of par value
                                                                                    121,800,000 121,600,000 121,700,000 10,400,000 10,500,000 10,700,000 10,700,000 
        accumulated other comprehensive income:
                                                                                           
        foreign currency translation adjustment
                                                                                    9,400,000 7,500,000 4,700,000 5,300,000 8,500,000 8,700,000 11,400,000 
        minimum pension liability, net of tax
                                                                                    -20,100,000 -20,100,000 -20,100,000 -20,100,000 -17,600,000 -17,600,000 -17,600,000 
        total accumulated other comprehensive loss
                                                                                    -10,700,000 -12,600,000 -15,400,000 -14,800,000 -9,100,000 -8,900,000 -6,200,000 
        inventories:
                                                                                           
        raw materials
                                                                                     77,000,000 79,600,000 73,700,000 73,400,000 71,800,000 72,500,000 
        work in process
                                                                                     5,200,000 2,700,000 3,400,000 3,400,000 3,800,000 4,300,000 
        finished goods
                                                                                     77,500,000 61,600,000 61,800,000 68,400,000 70,400,000 72,600,000 
        lifo reserve
                                                                                     -20,000,000 -19,500,000 -18,900,000 -19,800,000 -18,900,000 -18,700,000 
        total inventories
                                                                                     139,700,000 124,400,000 120,000,000 125,400,000 127,100,000 130,700,000 
        less: accumulated depreciation
                                                                                     -373,800,000 -365,400,000 -359,700,000 -365,700,000 -361,000,000 -355,800,000 
        accounts receivable less allowance for doubtful accounts of 0.6 in 2006 and 0.7 in 2005
                                                                                      124,600,000     
        other
                                                                                      7,400,000 7,700,000 5,200,000 8,100,000 9,300,000 
        fixed assets
                                                                                      515,300,000  518,200,000 515,800,000 508,300,000 
        net fixed assets
                                                                                      149,900,000 152,400,000 152,500,000 154,800,000 152,500,000 
        liabilities and stockholders’ equity
                                                                                           
        dividend payable
                                                                                      2,700,000     
        revolving credit
                                                                                       5,700,000 34,800,000 27,300,000 21,600,000 
        current portion of term loans
                                                                                      4,800,000 4,800,000 6,400,000 4,400,000 2,500,000 
        long-term debt:
                                                                                           
        term loans
                                                                                      20,200,000 14,000,000 13,300,000 4,500,000 2,600,000 
        senior secured notes due 2013
                                                                                      218,300,000 320,000,000 320,000,000 320,000,000 320,000,000 
        senior discount notes due 2014
                                                                                      143,300,000 139,900,000 136,500,000 133,300,000 130,100,000 
        total long-term debt
                                                                                      428,200,000 508,900,000 487,700,000 484,000,000 489,300,000 
        senior convertible preferred stock, .01 par value per share...
                                                                                           
        common stock, .01 par value per share...
                                                                                      200,000     
        retained
                                                                                      -217,100,000 -200,700,000 -198,300,000 -168,100,000 -172,300,000 
        total stockholders’
                                                                                      -112,200,000 -206,700,000 -198,500,000   
        total liabilities and stockholders’
                                                                                      555,800,000 551,800,000 570,000,000   
        accounts receivable less allowance for doubtful accounts of 0.7 in 2005 and 0.9 in 2004
                                                                                       118,700,000    
        fixed assets:
                                                                                           
        land
                                                                                       6,300,000    
        buildings
                                                                                       22,200,000    
        machinery and equipment
                                                                                       483,600,000    
        liabilities and stockholders’
                                                                                           
        accrued pension liabilities
                                                                                       28,800,000    
        commitments and contingencies—see note 9
                                                                                           
        senior convertible preferred stock, .01 par value...
                                                                                           
        common stock
                                                                                           
        accounts receivable less allowance for doubtful accounts of 0.8 in 2005 and 0.9 in 2004
                                                                                        126,100,000   
        other long-term reserves
                                                                                        82,500,000 89,000,000 86,200,000 
        accounts receivable less allowance for doubtful accounts of 0.9 in 2005 and 0.9 in 2004
                                                                                         123,500,000  
        accounts receivable less allowance for doubtful accounts of 0.9 in 2005 and 2004
                                                                                          119,200,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 
                                                                                             
          cash from operating activities:
                                                                                             
          net income
        7,100,000 29,700,000 23,800,000 16,400,000 -13,900,000 -10,200,000 19,000,000 26,800,000 13,000,000 13,000,000 26,200,000 24,400,000 26,200,000 13,800,000 19,000,000 11,600,000 18,800,000 22,200,000 10,000,000 26,900,000 25,800,000 18,600,000 75,500,000 29,400,000 -2,500,000 20,200,000 20,400,000 14,400,000 12,400,000 -2,400,000 6,900,000 1,000,000 23,700,000 -13,800,000 19,900,000 19,800,000 4,600,000 6,300,000 11,900,000 11,300,000 -1,800,000 -88,800,000 9,100,000 7,900,000 -4,200,000 -35,800,000 -4,200,000 700,000 -100,000 -5,600,000 19,500,000 14,700,000 11,500,000 14,200,000 16,200,000 20,900,000 15,900,000 -14,000,000 22,700,000 19,900,000 9,000,000 5,200,000 15,800,000 16,100,000 7,400,000 -12,800,000 17,100,000 12,500,000 4,600,000 75,000,000 25,500,000 24,300,000 13,200,000 5,000,000            
          adjustments to reconcile net income to net cash from operating activities:
                                                                                             
          depreciation and amortization
        19,400,000 20,000,000 17,600,000 18,000,000 18,000,000 15,300,000 17,900,000 18,200,000 16,100,000 14,300,000 14,300,000 14,400,000 14,000,000 11,600,000 16,900,000 13,400,000 14,200,000 14,300,000 13,400,000 13,900,000 16,100,000 14,400,000 12,400,000 12,800,000 14,500,000 12,800,000 14,300,000 13,400,000 14,600,000 12,300,000 13,000,000 13,700,000 11,800,000 14,800,000 12,100,000 11,700,000 11,200,000 10,900,000 13,800,000 13,100,000 15,100,000 9,400,000 16,900,000 17,700,000 15,000,000 14,200,000 11,200,000 9,700,000 8,900,000 7,900,000 7,200,000 7,300,000 7,300,000 7,100,000 6,700,000 7,600,000 6,800,000 28,000,000 7,100,000 6,900,000 6,800,000 7,700,000 7,000,000 6,600,000 6,800,000 6,700,000 6,700,000 6,700,000 6,500,000 11,900,000 5,300,000 7,500,000 8,000,000 9,100,000            
          depreciation in impairment and restructuring
         1,700,000 5,800,000 12,200,000                                                                                 
          stock-based compensation
        3,900,000 3,100,000 2,400,000 1,700,000 6,600,000 4,700,000 5,200,000 5,500,000 5,400,000 4,300,000 5,200,000 3,800,000 4,000,000 3,200,000 3,300,000 3,200,000 3,500,000 3,200,000 3,200,000 3,100,000 3,500,000 2,800,000 3,000,000 3,000,000 2,500,000 3,100,000 3,100,000 3,000,000 2,900,000 3,200,000 3,300,000 3,100,000 2,900,000 2,800,000 2,800,000 2,700,000 2,300,000 3,200,000 2,300,000 2,300,000 1,100,000 700,000 1,100,000 1,300,000 700,000 100,000 1,400,000 2,000,000 1,200,000 -400,000 1,900,000 1,400,000 1,400,000 1,800,000 1,900,000 1,700,000 1,500,000 1,600,000 1,500,000 1,400,000 800,000 800,000 700,000 900,000 900,000 800,000 -500,000 1,400,000 800,000 900,000                
          change in derivative contracts
        3,900,000 -19,500,000 -4,900,000 -700,000 -9,100,000 10,900,000 -1,200,000 -1,800,000    -1,100,000 -2,500,000 1,900,000 6,800,000 300,000 1,100,000 4,400,000 900,000 -2,600,000                                                                 
          non-cash interest expense
        900,000 900,000 900,000 1,000,000 900,000 800,000 900,000 800,000 800,000 800,000 800,000 2,700,000 600,000 600,000 500,000 1,000,000 700,000 700,000 700,000 600,000 700,000 600,000 700,000 600,000 700,000 700,000 700,000 600,000 600,000 600,000 600,000 700,000 500,000 600,000 500,000 500,000 500,000 900,000 900,000 3,000,000 900,000 900,000 900,000 900,000 900,000 800,000 2,600,000 400,000 400,000 500,000 400,000 400,000 400,000 500,000 400,000 400,000 400,000 400,000 400,000 400,000 400,000 400,000 500,000 700,000 100,000 2,400,000 4,800,000 4,600,000 4,600,000 4,400,000 4,300,000 4,300,000 4,100,000 4,100,000            
          (gain) on sale of assets
        -4,300,000          -200,000 -1,800,000  -100,000 -2,500,000                                                                     
          insurance proceeds
         -2,200,000 -500,000 -500,000 -900,000 -700,000   -100,000 -300,000 -400,000 -2,500,000       -1,600,000 -1,400,000                                                         
          deferred income taxes
         9,700,000 600,000 700,000 300,000 1,800,000 500,000 500,000 4,100,000 700,000 1,000,000 -100,000 1,600,000 500,000 300,000 300,000 15,900,000 600,000 600,000 -200,000 12,600,000 1,500,000 -2,800,000 -1,900,000 -8,200,000 -3,100,000 400,000 4,100,000 600,000 4,500,000 -100,000 800,000 600,000 100,000 100,000 400,000 -800,000 200,000 100,000 -15,200,000 -200,000 1,000,000 -1,600,000 5,700,000 3,400,000 600,000 -7,200,000 8,400,000 9,300,000 1,100,000 700,000 300,000 3,300,000 2,400,000 2,000,000 -15,500,000 2,000,000 2,000,000 200,000 1,100,000 3,200,000 -300,000 1,000,000 27,800,000 -1,900,000 -1,300,000 -1,700,000 4,800,000 7,000,000 700,000 500,000 500,000            
          pension settlement
         -1,900,000 29,000,000                                                                                 
          change in other liabilities
        -300,000 1,700,000 300,000 -1,000,000 4,000,000 5,200,000 -2,200,000 -1,800,000 -3,800,000 -400,000 1,500,000 -1,300,000 400,000 700,000 1,400,000 -2,000,000 1,000,000 -1,700,000 -200,000 800,000 3,200,000 -8,100,000 -1,300,000 5,800,000 -5,000,000 -14,300,000 -3,100,000 -3,400,000 -3,200,000 -16,400,000 -2,500,000 -2,300,000 -1,400,000 -2,500,000 -11,900,000 -4,400,000 -2,300,000 2,600,000 -2,400,000 -2,500,000 -2,700,000 -1,700,000 -3,900,000 -600,000 700,000 600,000 -2,700,000 -5,400,000 -2,800,000 -2,200,000 -5,600,000 -5,000,000 -3,600,000 -4,700,000 -3,500,000 -7,200,000 2,400,000 7,200,000 -3,400,000 -1,000,000 1,200,000 3,100,000 -3,200,000 -1,600,000 -800,000 -2,400,000 2,500,000 3,000,000 3,700,000  -100,000               
          cloud-based software implementation costs, net of amortization
        100,000                                                                                     
          other - net
        100,000 3,000,000 -2,100,000 -2,300,000 -1,500,000 6,000,000 -500,000 1,600,000 -800,000 3,200,000 -1,700,000 300,000 400,000 -500,000 3,400,000 2,400,000 1,400,000 1,400,000 1,800,000 -600,000 -2,400,000 800,000 -3,200,000 4,200,000 1,000,000 300,000 3,700,000 -3,800,000 -400,000 1,100,000 2,200,000 3,200,000 -2,100,000   -1,200,000                                                 
          changes in working capital:
                                                                                             
          accounts receivable
        -23,200,000 34,400,000 10,600,000 -3,000,000 -11,100,000 40,200,000 -11,400,000 -2,500,000 -18,200,000 42,400,000 14,300,000 -16,700,000 -25,100,000 26,700,000 -6,700,000 -12,300,000 -40,000,000 14,000,000 5,000,000 -10,400,000 -21,300,000 23,800,000 -3,600,000 -10,700,000 -21,000,000 22,000,000 28,800,000 -27,100,000 1,700,000 28,600,000 -6,900,000 12,300,000 -41,700,000 21,600,000 1,600,000 -11,400,000 -27,800,000 30,600,000 1,600,000 -9,200,000 -10,300,000 42,900,000 1,700,000 -13,600,000 3,100,000 29,000,000 -15,300,000 -2,400,000 2,100,000 20,800,000 -11,800,000 6,600,000 -12,700,000 11,200,000 23,300,000 -6,200,000 -28,500,000 17,600,000 3,900,000 -14,900,000 -39,800,000 16,100,000 500,000 -13,300,000 -22,400,000 17,600,000 -200,000 -1,300,000 43,000,000 25,500,000 -23,400,000 -26,200,000 8,700,000            
          inventories
        17,800,000 -3,500,000 4,400,000 5,500,000 4,000,000 -11,000,000 1,600,000 11,300,000 -8,200,000 -20,400,000 400,000 5,200,000 -22,400,000 -36,000,000 13,800,000 -6,100,000 -13,500,000 -20,100,000 -9,900,000   -22,600,000 -229,800,000 -15,100,000 276,200,000 -21,400,000 700,000 6,400,000 -500,000 2,000,000 5,800,000 -15,400,000 -10,700,000 -9,800,000 5,900,000 13,100,000 -8,500,000 -17,100,000 7,800,000 11,200,000 -5,200,000 -18,000,000 9,200,000 -300,000 4,800,000 -18,900,000 6,700,000 4,800,000 -6,600,000 -3,900,000 19,800,000 3,800,000 1,900,000 3,400,000 1,100,000 -14,300,000 -16,700,000 7,600,000 -9,800,000 12,900,000 -5,600,000 -4,400,000 12,000,000 -900,000 1,500,000 12,000,000 -15,100,000 19,900,000 14,700,000 1,600,000 -13,500,000 4,200,000 -7,400,000 -1,100,000            
          accounts payable
        22,100,000 -35,200,000 -8,700,000 19,500,000 -32,800,000 11,900,000 -14,200,000 -12,800,000 -4,300,000 -4,700,000 11,800,000 -21,600,000 14,100,000 13,200,000 -8,500,000 15,000,000 13,000,000 13,200,000 7,200,000 9,000,000 -8,500,000 18,300,000 -174,700,000 -24,500,000 155,600,000 42,600,000 -15,200,000 -400,000 -30,100,000 13,100,000 -5,300,000 20,600,000 2,400,000 800,000 -16,200,000 9,600,000 -7,800,000 4,100,000 -3,900,000 -2,200,000 7,000,000 -9,200,000 -10,000,000 20,000,000 24,200,000 -4,500,000 9,700,000 1,000,000 -16,800,000 12,900,000 -7,800,000 2,300,000 -2,500,000 -6,800,000 -5,800,000 19,000,000 -6,500,000 5,800,000 -5,300,000 3,300,000 11,500,000 2,800,000 -7,900,000 8,000,000 6,800,000 -11,600,000 14,100,000 -5,800,000 -13,500,000 -2,700,000 -14,400,000 -1,000,000 1,300,000 9,500,000            
          accrued liabilities
        1,100,000 -6,000,000 7,200,000 -10,000,000 -24,300,000 600,000 5,200,000 -16,000,000 -9,000,000 7,600,000 8,700,000 -200,000 -18,500,000 200,000 400,000 -3,400,000 -4,500,000 8,400,000 -7,900,000 -10,600,000 -10,900,000 1,800,000 -89,400,000 -4,800,000 100,900,000 700,000 9,200,000 -1,500,000 -4,500,000 11,600,000 -9,600,000 -8,800,000 -20,200,000 32,300,000 -9,400,000 18,100,000 -9,800,000 -7,000,000 12,100,000 8,900,000 -5,600,000                                             
          other working capital
        -2,300,000 13,700,000 -3,200,000 -700,000 -2,200,000 -2,100,000 -1,700,000 -2,000,000 -1,600,000 4,200,000 300,000 200,000 -6,000,000 1,900,000 4,200,000 -1,300,000 -1,300,000 -3,300,000 -800,000 1,500,000 -5,100,000 6,600,000 -5,400,000 9,000,000 -7,200,000 -1,100,000 -800,000 8,000,000 -3,500,000 7,200,000 -2,200,000 500,000 3,700,000 500,000 -5,500,000 2,600,000 100,000 2,700,000 -5,300,000 1,400,000                                             
          net cash from operating activities
        46,300,000 45,100,000 49,600,000 50,500,000 -22,700,000 74,700,000 29,800,000 27,200,000 -12,300,000 66,600,000 81,600,000 13,200,000 -15,300,000 34,900,000 46,200,000 29,200,000 -8,000,000 43,400,000 23,500,000 43,500,000 -7,400,000 61,600,000 43,300,000 39,400,000 -17,200,000 58,300,000 55,600,000 15,800,000 -14,400,000 70,300,000 4,900,000 32,100,000 -29,000,000 53,300,000 17,200,000 55,400,000 -24,100,000 37,000,000 48,200,000 31,800,000 2,500,000 32,600,000 17,000,000 58,400,000 19,700,000 24,700,000 19,500,000 5,000,000 -13,700,000 52,000,000 45,600,000 14,300,000 5,700,000 23,300,000 51,100,000 19,200,000 -15,800,000 32,400,000 18,700,000 35,300,000 -9,500,000 41,000,000 31,700,000 16,400,000 16,200,000 19,700,000 29,800,000 41,200,000 21,600,000 -6,400,000 38,700,000 17,200,000 2,400,000 15,700,000            
          cash from investing activities:
                                                                                             
          capital expenditures
        -11,400,000 -16,600,000 -12,000,000 -12,100,000 -14,300,000 -18,600,000 -15,400,000 -17,100,000 -26,300,000 -29,200,000 -28,700,000 -32,200,000 -30,400,000 -25,300,000 -24,200,000 -29,600,000 -26,200,000 -37,400,000 -26,700,000 -36,700,000 -24,200,000 -26,000,000 -17,300,000 -15,900,000 -10,600,000 -10,400,000 -8,300,000 -7,500,000 -11,000,000 -28,300,000 -27,800,000 -31,100,000 -22,500,000 -18,900,000 -14,400,000 -19,300,000 -14,900,000 -17,700,000 -10,900,000 -12,700,000 -8,600,000 -14,300,000 -9,100,000 -10,300,000 -7,000,000 -24,800,000 -23,400,000 -20,800,000 -14,800,000 -43,500,000 -13,700,000 -9,300,000 -6,400,000 -13,300,000 -6,300,000 -5,900,000 -3,400,000 -13,600,000 -7,400,000 -7,800,000 -4,400,000 -16,200,000 -6,000,000 -5,200,000 -2,500,000 -6,800,000 -4,400,000 -3,000,000 -3,800,000 -10,600,000 -12,200,000 -9,900,000 -4,400,000 -8,700,000            
          free cash flows
        34,900,000 28,500,000 37,600,000 38,400,000 -37,000,000 56,100,000 14,400,000 10,100,000 -38,600,000 37,400,000 52,900,000 -19,000,000 -45,700,000 9,600,000 22,000,000 -400,000 -34,200,000 6,000,000 -3,200,000 6,800,000 -31,600,000 35,600,000 26,000,000 23,500,000 -27,800,000 47,900,000 47,300,000 8,300,000 -25,400,000 42,000,000 -22,900,000 1,000,000 -51,500,000 34,400,000 2,800,000 36,100,000 -39,000,000 19,300,000 37,300,000 19,100,000 -6,100,000 18,300,000 7,900,000 48,100,000 12,700,000 -100,000 -3,900,000 -15,800,000 -28,500,000 8,500,000 31,900,000 5,000,000 -700,000 10,000,000 44,800,000 13,300,000 -19,200,000 18,800,000 11,300,000 27,500,000 -13,900,000 24,800,000 25,700,000 11,200,000 13,700,000 12,900,000 25,400,000 38,200,000 17,800,000 -17,000,000 26,500,000 7,300,000 -2,000,000 7,000,000            
          sale of assets
         2,700,000 400,000 2,100,000                                                                                 
          sale of business and divestitures
        500,000                                                                                    
          other investing activities
        400,000 400,000 400,000                                                                                   
          net cash from investing activities
        -10,500,000 -34,200,000 800,000 -21,700,000 -17,600,000 -18,900,000 -12,800,000 -115,800,000 -25,800,000 -27,700,000 -27,700,000 -32,100,000 -28,500,000 -39,700,000 -24,000,000 -29,100,000 -22,000,000 -10,800,000 -22,900,000 -36,300,000 -19,500,000 -29,400,000 61,400,000 -15,800,000 -10,600,000 -10,300,000 -8,500,000 -5,700,000 -9,300,000 -34,800,000 -26,100,000 -230,400,000 -85,100,000 -18,500,000 -14,100,000 -19,000,000 -4,900,000 -17,000,000 -16,000,000 -12,400,000 -8,300,000 -14,100,000 -6,900,000 -10,100,000 -10,000,000 -24,600,000 -490,200,000 -20,800,000 -44,400,000 -45,300,000 -12,200,000 -8,600,000 -6,200,000 -24,800,000 -6,200,000 -5,700,000 -3,200,000 -24,800,000 -6,800,000 -8,100,000 -5,000,000 -31,700,000 -3,400,000 -5,200,000 -23,100,000 -8,500,000 -4,400,000 -4,100,000 -3,800,000 146,900,000 -12,100,000 -10,000,000 -4,100,000 -9,000,000 6,300,000 -9,200,000 -4,600,000 -9,800,000 -14,100,000 -42,700,000 -4,600,000 -9,700,000 -4,700,000   
          cash from financing activities:
                                                                                             
          borrowings of credit facility
        166,800,000 137,900,000 148,900,000 127,100,000 144,400,000 107,400,000 123,400,000 285,000,000 190,700,000                                                                             
          repayments of credit facility
        -165,500,000 -141,600,000 -192,700,000 -137,700,000 -94,100,000 -156,400,000 -133,800,000 -261,100,000 -160,800,000                                                                             
          repayments of long-term debt
        -1,200,000 -1,200,000 -1,200,000 -1,300,000 -1,200,000 -1,200,000 -1,300,000 -1,200,000 -2,000,000   -2,000,000 -2,500,000 -2,500,000 -2,600,000 -2,500,000 -63,200,000 -2,400,000 -2,500,000 -2,600,000 -2,500,000 -8,500,000 -6,100,000 -12,600,000 -7,400,000 -2,500,000 -6,300,000 -4,100,000 -5,300,000 -2,900,000 -538,500,000 -8,300,000 -8,400,000 -7,500,000 -7,500,000 -18,200,000 -7,500,000 -8,400,000 -6,600,000              -100,000 -900,000  -100,000     -3,000,000 -3,000,000 -3,000,000  -11,400,000 -3,100,000 -3,300,000  -3,400,000       
          issuances of common stock
        100,000 300,000 500,000 300,000 300,000 800,000 400,000 600,000 3,500,000 6,700,000 1,400,000 600,000 1,200,000 200,000 200,000 400,000 300,000 300,000 300,000 700,000 1,100,000 300,000 300,000 300,000 200,000 3,000,000 400,000 300,000 300,000 400,000 300,000 900,000 1,300,000 800,000 300,000 1,600,000 -100,000 400,000         200,000 700,000 200,000 600,000 100,000 200,000                        
          repurchases of common stock
        -29,000,000 -4,900,000 -4,100,000 -10,100,000 -19,100,000 -1,300,000 -10,400,000 -32,200,000 -6,900,000 -10,300,000 -3,900,000 -100,000 -5,800,000 -5,100,000 -7,400,000 -11,100,000 -8,200,000 -1,400,000 -100,000 -1,800,000 -400,000 -1,200,000 -900,000 -100,000 -24,300,000 -7,400,000 -100,000 100,000 -3,900,000 -1,300,000 -300,000 -300,000 -2,000,000 -15,900,000 -1,600,000 100,000 -6,500,000 -1,700,000 -100,000 -200,000 -900,000                     
          dividends paid and return of capital to noncontrolling interests
        -2,200,000                                                                                     
          net cash from financing activities
        -31,000,000 -11,200,000 -50,600,000 -25,400,000 28,700,000 -52,700,000 -23,200,000 88,600,000 23,000,000 -29,000,000 -47,000,000 21,800,000 56,800,000 -7,500,000 -16,200,000 -4,900,000 33,400,000 -32,300,000 -700,000 -4,400,000 33,400,000 -35,000,000 -97,600,000 -46,400,000 50,300,000 -55,700,000 -48,100,000 -5,700,000 20,800,000 -55,000,000 21,200,000 210,700,000 105,900,000 -24,400,000 6,800,000 -19,800,000 31,500,000 -18,100,000 -30,100,000 -16,800,000 2,300,000 -27,100,000 -29,700,000 -24,400,000 -42,200,000 -21,500,000 492,200,000 15,200,000 30,200,000 1,200,000 -26,100,000 2,100,000 -7,500,000 -300,000 -28,400,000 -5,100,000 6,500,000 -13,200,000 -4,000,000 -14,700,000 18,600,000 -4,400,000 -18,500,000 -14,700,000 -26,700,000 -83,300,000 -4,500,000 -4,600,000 -4,500,000 -87,300,000 -23,300,000 -7,700,000 -4,800,000 -11,500,000 -32,700,000 -7,900,000 -5,600,000 -1,100,000 -10,600,000 35,600,000 14,100,000 -16,000,000 -25,600,000   
          effect of exchange rate changes on cash
         400,000 -300,000 1,700,000 1,000,000 -3,700,000 1,800,000 -100,000 -2,400,000 3,100,000 -1,600,000 -1,100,000 100,000 2,800,000 -3,600,000 -4,000,000 300,000 300,000 -1,500,000 -500,000 -800,000 1,800,000 -1,100,000 1,700,000 -900,000   400,000 -2,400,000 -2,100,000 100,000 -300,000 300,000 100,000 1,200,000 -800,000 -1,800,000 -2,700,000 -2,600,000 1,400,000 1,500,000 7,200,000  -800,000 300,000 400,000  1,900,000 -1,300,000 -2,000,000  2,100,000 -700,000 1,000,000  -2,300,000 600,000 1,100,000  5,200,000 -1,900,000 -1,300,000  1,300,000 -200,000     100,000 800,000 -500,000        
          net increase in cash and cash equivalents
        4,800,000     -600,000 -4,400,000 -100,000 -17,500,000 13,000,000 5,300,000 1,800,000 13,100,000 -9,500,000 2,400,000 -8,800,000 3,700,000 600,000 -1,600,000 2,300,000 5,700,000 -1,000,000 6,500,000 -21,200,000 21,900,000 -7,700,000 -1,400,000   -21,900,000 10,300,000 -8,100,000 10,100,000 10,200,000 16,600,000 2,600,000         -24,000,000    9,800,000    -2,200,000 18,600,000 7,700,000 -11,500,000 -5,100,000 5,600,000 13,100,000 5,200,000 2,200,000 15,000,000 -5,400,000 -34,900,000 -72,500,000 20,900,000 33,800,000 13,100,000 52,300,000 3,300,000    -5,600,000           
          cash and cash equivalents at beginning of period
        38,000,000 43,900,000 66,500,000 33,300,000 45,500,000 38,500,000 32,300,000 40,600,000 60,300,000 20,800,000 21,800,000                                     26,100,000  41,800,000 
          cash and cash equivalents at end of period
        42,800,000 100,000 -500,000 5,100,000 33,300,000 -600,000 -4,400,000 -100,000 49,000,000 13,000,000 5,300,000 1,800,000 46,400,000 -9,500,000 2,400,000 -8,800,000 49,200,000 600,000 -1,600,000 2,300,000 44,200,000 -1,000,000 6,500,000 -21,200,000 54,200,000 -7,700,000 -1,400,000 4,000,000 38,100,000 -21,900,000 10,300,000 52,200,000 10,100,000 10,200,000 16,600,000 23,400,000 3,100,000 1,300,000 800,000 15,600,000 -11,200,000 -18,200,000 25,400,000 25,800,000  20,700,000 -300,000 54,700,000  9,200,000 6,500,000 56,700,000  18,600,000 7,700,000 42,600,000  5,600,000 13,100,000 40,500,000  15,000,000 -5,400,000 23,500,000  20,900,000 33,800,000 76,200,000  3,400,000 -1,800,000 11,000,000  -5,600,000 8,500,000 17,700,000  5,000,000 -1,500,000 25,400,000  -1,300,000 -1,200,000 39,000,000 
          supplemental disclosure of non-cash investing and financing activities:
                                                                                             
          right-of-use assets obtained in exchange for new operating lease liabilities
        7,300,000 5,300,000 10,600,000 19,400,000 3,900,000 6,100,000 8,800,000 7,200,000 1,800,000 10,500,000 7,500,000 2,700,000 5,900,000 1,600,000 4,200,000 4,800,000 1,500,000 1,900,000 2,400,000 3,500,000 4,800,000 2,700,000 4,200,000 1,400,000 300,000 3,200,000 10,200,000 2,200,000 14,300,000                                                         
          accrued capital expenditures
        400,000 800,000 -1,500,000 -1,100,000 3,500,000 -1,300,000 3,500,000 -400,000 -2,400,000 8,400,000 3,500,000 -600,000 -3,300,000 11,500,000 -1,300,000 4,400,000 -1,000,000 5,200,000 5,200,000 1,400,000                                                               
          loss on sale of assets
         -1,100,000   -600,000 600,000   100,000                                                                             
          cloud-based software implementation costs
                                                                                             
          acquisitions
             100,000 400,000                                         -29,600,000           -400,000 -600,000   -22,300,000         -200,000 -600,000   -5,100,000     
          borrowings of long-term debt
                                 99,700,000 300,000 500,000,000     -700,000 200,000   -5,900,000 317,700,000 9,000,000 22,200,000                                     
          payment of debt issuance costs
         -500,000   -700,000   -400,000 -4,100,000 -800,000 -200,000 -4,500,000 -100,000     -200,000 -100,000   -1,800,000 -1,100,000 -11,000,000                                                 
          dividends paid
         -1,700,000 -1,500,000 -1,600,000 -1,600,000 -1,300,000 -1,500,000 -1,600,000 -1,500,000 -1,200,000 -1,300,000 -1,200,000 -1,300,000 -1,000,000 -1,100,000 -1,000,000 -1,100,000                         -1,900,000 -6,800,000 -5,200,000 -5,000,000 -5,200,000 -5,000,000 -5,800,000 -5,100,000 -5,200,000 -5,000,000 -5,000,000 -5,000,000 -5,000,000 -4,500,000 -4,600,000 -4,500,000 -4,600,000 -4,500,000 -4,600,000 -4,500,000 -9,500,000 -4,500,000 -4,500,000 -4,500,000 -4,500,000 -4,500,000 -4,500,000 -4,600,000 -4,600,000 -3,500,000 -3,500,000 -3,500,000 -3,600,000 -3,500,000 -3,500,000 -3,500,000 -2,100,000 -8,200,000 -3,000,000    
          non-cash consideration for sale of assets and acquisition
                                                                                             
          supplemental disclosure - cash paid during the year for:
                                                                                             
          interest
                                                                                             
          income taxes
                                                                                             
          net decrease in cash and cash equivalents
          -500,000 5,100,000 -10,600,000                        -2,500,000         3,100,000   -6,200,000    -25,300,000   -300,000 -27,500,000   6,500,000 -10,000,000                    -6,500,000    -6,700,000         
          non-cash consideration for sale of assets or acquisition
                                                                                             
          divestiture of kccc
           -7,600,000                                                                                 
          acquisition non-cash consideration
             100,000 -100,000                                                                               
          adjustments to reconcile net cash from operating activities:
                                                                                             
          supplemental disclosure of cash flow information:
                                                                                             
          cash paid during the year for:
                                                                                             
          insurance proceeds received
              500,000 500,000  700,000    300,000 400,000          1,600,000 1,400,000  800,000                                                       
          cash from sale of assets
              2,200,000    300,000 1,900,000  200,000 200,000 3,800,000  200,000                                                                   
          (gain) on sale of assets and investment
                                                                                             
          net cash from sale of discontinued operations and asset sales
                             -3,400,000                                                                
          net increase in credit facility borrowings
                  -43,200,000 139,600,000 63,500,000 -1,600,000 -15,100,000 7,600,000 47,400,000 -21,900,000 2,900,000 -2,400,000 36,600,000   -44,200,000 54,100,000 -56,100,000 -40,000,000 1,000,000 34,000,000                                                         
          cash paid for amounts included in the measurement of lease liabilities:
                                                                                             
          operating cash outflow from operating leases
                   7,400,000 7,000,000 7,400,000 7,300,000 7,200,000 7,400,000 7,300,000 7,700,000 7,600,000 7,900,000 7,900,000 8,500,000 7,200,000 7,900,000 8,100,000 15,300,000 100,000 7,600,000                                                         
          loss on sale of discontinued operations
                                                                                             
          change in cash and cash equivalents of discontinued operations held for sale
                             500,000 -100,000 300,000                                                             
          noncash investing activities:
                                                                                             
          non-cash investing activities
                                                                                             
          loss on sale of assets and investment
                                                                                             
          gain on sale of assets
                          -300,000 -7,500,000                              -1,100,000   300,000                                
          net cash from sale of assets
                            4,700,000                                                                 
          (gain) on sale of discontinued operations and loss on disposal of assets and investment
                             200,000                                                                
          acquisitions, net of cash acquired
                                     100,000 -201,200,000 -62,900,000         -15,300,000             400,000    -15,600,000                        
          change in derivative liability
                              -3,900,000 -8,700,000 8,400,000                                                             
          net decrease in credit facility borrowings
                                                                                             
          assets
                                                                                             
          cash and cash equivalents
                               -21,200,000 54,200,000                                                             
          accounts receivable, net of allowance of 2.5 and 2.6
                                                                                             
          income tax receivable
                               -600,000 4,200,000                                                             
          assets of discontinued operations held for sale
                               600,000 67,500,000                                                             
          other current assets
                               -7,900,000 26,000,000                                                             
          total current assets
                               -31,800,000 604,900,000                                                             
          property, plant and equipment
                               13,900,000 355,400,000                                                             
          operating lease right-of-use assets
                               -3,400,000 106,100,000                                                             
          goodwill
                               1,700,000 292,700,000                                                             
          intangible assets
                               -3,900,000 161,700,000                                                             
          deferred tax assets
                               -5,100,000 31,000,000                                                             
          non-current assets of discontinued operations held for sale
                                                                                             
          other assets
                               11,300,000 21,300,000                                                             
          total assets
                               -17,300,000 1,573,100,000                                                             
          liabilities
                                                                                             
          current operating lease liabilities
                               -500,000 21,500,000                                                             
          current maturities of long-term debt
                               10,200,000                                                             
          liabilities of discontinued operations held for sale
                               -200,000 34,600,000                                                             
          total current liabilities
                               -30,000,000 322,800,000                                                             
          long-term debt
                               -46,100,000 943,000,000                                                             
          accrued postretirement benefits
                               -100,000 46,500,000                                                             
          deferred tax liabilities
                               300,000 6,400,000                                                             
          operating lease liabilities
                               -3,300,000 86,400,000                                                             
          non-current liabilities of discontinued operations held for sale
                                                                                             
          other long-term liabilities
                               -15,200,000 58,800,000                                                             
          total liabilities
                               -94,400,000 1,463,900,000                                                             
          commitments and contingent liabilities
                                                                                             
          equity
                                                                                             
          senior convertible preferred stock, 0.01 par value per share; 10,000,000 shares authorized; no shares issued
                                                                                             
          common stock, 0.01 par value per share; 80,000,000 shares authorized; 23,620,402 and 23,321,087 shares issued
                                                                                             
          additional paid-in capital
                               3,300,000 224,700,000                                                             
          retained earnings
                               29,200,000 92,400,000                                                             
          accumulated other comprehensive loss
                               44,300,000 -126,100,000                                                             
          treasury stock, at cost, 2,574,675 and 2,515,925 shares
                                                                                             
          total koppers shareholders’ equity
                               76,800,000 99,100,000                                                             
          noncontrolling interests
                               300,000 10,100,000                                                             
          total equity
                               77,100,000 109,200,000                                                             
          total liabilities and equity
                               -17,300,000 1,573,100,000                                                             
          loss on disposal of assets and investment
                                  300,000                                                           
          net cash from divestitures and asset sales
                                 100,000 -200,000 200,000 300,000 -6,500,000 800,000 1,200,000 300,000 400,000 300,000 300,000 500,000 700,000                                                
          accounts receivable, net of allowance of 2.4 and 2.6
                                176,800,000                                                             
          common stock, 0.01 par value per share; 80,000,000 shares authorized; 23,556,317 and 23,321,087 shares issued
                                200,000                                                             
          treasury stock, at cost, 2,574,631 and 2,515,925 shares
                                -92,100,000                                                             
          impairment of long-lived assets
                                                                                             
          loss on extinguishment of debt
                                         13,300,000                                                 
          loss on disposal of investments
                                                                                             
          loss on pension settlement
                                         1,200,000                                                    
          repayments received on loan
                                                                                            
          gain on disposal of assets and investment
                                      900,000 1,200,000 100,000 -100,000                                                    
          net increase in revolving credit facility borrowings
                                     -47,900,000 47,700,000 118,200,000 116,900,000                                                     
          gain on insurance proceeds
                                      -800,000                                                       
          goodwill impairment
                                                                                             
          gain on sale of business
                                                                                           
          equity loss, net of dividends received
                                             300,000 200,000 500,000    500,000                                         
          deferred revenue
                                             -1,500,000 -300,000 -1,000,000 -100,000 -700,000 -700,000                                           
          borrowings of revolving credit
                                         81,200,000 100,900,000 153,800,000 369,500,000 137,800,000 167,600,000 177,100,000 113,200,000 146,700,000 165,800,000 151,500,000 148,100,000 51,800,000 382,700,000 70,500,000 67,500,000 11,600,000 49,800,000 36,500,000 33,500,000 56,900,000 70,900,000 98,100,000 52,800,000 47,700,000 41,400,000 76,100,000 13,200,000 42,500,000 70,600,000 25,800,000     2,400,000 22,800,000 84,500,000 94,000,000 93,500,000 59,800,000 83,700,000 81,000,000         
          repayments of revolving credit
                                         -101,000,000 -94,200,000 -167,100,000 -288,800,000 -147,500,000 -189,700,000 -185,100,000 -103,100,000 -154,900,000 -188,200,000 -166,300,000 -176,500,000 -62,200,000 -192,100,000 -61,200,000 -52,500,000 -16,700,000 -44,700,000 -36,500,000 -34,900,000 -73,900,000 -71,000,000 -86,000,000 -61,400,000 -47,200,000 -51,400,000 -51,600,000 -13,200,000 -56,500,000 -75,500,000 -46,900,000     -29,500,000 -19,500,000 -83,800,000 -92,200,000 -98,700,000 -78,700,000 -84,800,000 -79,800,000    -48,700,000 -44,500,000 -140,900,000 -73,500,000 -66,200,000 
          impairment charges
                                                  2,700,000 4,700,000                                     
          gain on disposal of investment
                                           -100,000 -1,300,000                                                 
          repayments of loan
                                           9,500,000                                                 
          other
                                             3,500,000 800,000 1,800,000 2,100,000 3,500,000 1,200,000 -1,300,000 1,800,000 2,500,000 -2,100,000 400,000 200,000 -100,000 200,000 300,000 100,000 -900,000 800,000 -1,200,000 200,000 -100,000 100,000   400,000 -300,000 500,000 200,000 200,000 200,000   -1,500,000 1,300,000 1,600,000 200,000 1,700,000        1,500,000 600,000 200,000 
          proceeds from issuance of noncontrolling interest
                                                                                         
          payment of deferred financing costs
                                               -900,000 -100,000    -100,000 -100,000 -1,100,000    -500,000 -300,000 -100,000          -100,000   -300,000 100,000 -400,000 -400,000 -800,000   -200,000 
          net cash proceeds from divestitures and asset sales
                                               300,000 300,000 200,000 2,200,000 200,000 12,300,000 200,000    500,000 1,500,000 700,000 200,000 100,000 300,000 200,000 200,000  600,000    200,000 1,700,000 500,000   160,400,000 100,000 -100,000 300,000 -100,000 11,600,000 200,000 200,000 100,000 200,000       
          equity loss (income), net of dividends received
                                                                                             
          excess tax benefit from employee stock plans
                                                                                            
          cash paid during the year for :
                                                                                             
          accrued liabilities and other working capital
                                                  -9,400,000 -4,200,000 -25,700,000 30,300,000 8,300,000 -7,200,000 2,300,000  13,600,000 -17,600,000 1,400,000 -3,200,000 7,000,000 -3,600,000 7,200,000 -6,200,000 -200,000 7,500,000 6,000,000 7,900,000 3,000,000 -600,000 16,300,000 -43,900,000 1,400,000 -1,300,000 3,100,000 -2,000,000 -5,800,000 -1,500,000 8,300,000 -25,700,000            
          gain on sale of assets and businesses
                                                   -3,200,000                                         
          equity income, net of dividends received
                                                          -200,000 -200,000  -100,000 -300,000 -500,000  -100,000        500,000 800,000 100,000                 
          cash and cash equivalents at beginning of year
                                                    51,100,000    82,200,000 66,700,000 54,100,000 35,300,000 58,400,000 63,100,000 -3,100,000 -600,000 17,500,000 24,400,000       
          supplemental disclosure of cash flows information:
                                                                                             
          promissory note from divestiture and asset sale
                                                    1,300,000                                         
          cash from operating activities
                                                                                   24,800,000 4,000,000  29,700,000 6,000,000 -10,400,000  29,300,000 9,800,000 3,800,000 
          (gain) loss on sale of assets
                                                                                             
          decrease (increase) in working capital:
                                                                                             
          cash from investing activities
                                                                                             
          net cash proceeds from loan to related party
                                                                                             
          cash from financing activities
                                                                                             
          effect of exchange rates on cash
                                                                                        200,000 -300,000 -500,000 
          cash and cash equivalents at end of year
                                                                                             
          decrease in working capital:
                                                                                             
          acquisitions,
                                                                                             
          increase in working capital:
                                                                                             
          equity income of affiliated companies
                                                                                             
          net cash proceeds (payments) from loan to related party
                                                                                             
          repayments on long-term debt
                                                                                             
          cash paid (refunded) during the year for:
                                                                                             
          noncash investing and financing activities:
                                                                                             
          capital leases
                                                                                             
          equity income of affiliated companies, net of dividends received
                                                                             100,000 200,000 300,000 200,000            
          loan to related party
                                                                                             
          net cash proceeds (payments) from divestitures and asset sales
                                                                                             
          borrowings on long-term debt
                                                                                             
          gain on sale of fixed assets
                                                                        -1,600,000                     
          loss on sale of fixed assets
                                                                                             
          gain on extinguishment of debt
                                                                                             
          add: cash of assets held for sale at beginning of year
                                                                                           
          less: cash of assets held for sale at end of year
                                                                                             
          (gain) loss on sale of fixed assets
                                                                                -300,000             
          loss on disposal of fixed assets
                                                                                            
          less: cash of assets held for sale at end of period
                                                                              100,000               
          minority interest
                                                                             -1,000,000 500,000 600,000 600,000 400,000            
          common stock issuance costs
                                                                                             
          acquisitions – liabilities assumed
                                                                                             
          purchases of common stock
                                                                              -19,000,000 -800,000 -100,000         100,000 -100,000   
          change in reserves
                                                                                -100,000 3,800,000            
          write-offs of deferred financing costs
                                                                                             
          restructuring and impairment
                                                                                             
          common stock issued for employee stock plans
                                                                                             
          borrowings from revolving credit facilities
                                                                                      63,500,000       
          repayments of revolving credit facilities
                                                                                      -67,000,000       
          borrowings from long-term debt
                                                                                      -100,000 43,100,000 10,000,000  11,200,000   
          issuance of common stock
                                                                                      121,800,000     
          stock issuance costs
                                                                                      -200,000 -100,000 -9,300,000     
          net increase in cash
                                                                                             
          net decrease in cash
                                                                                             
          borrowings from revolving credit
                                                                                        54,000,000  140,100,000 69,000,000 65,000,000 
          repayment of long-term debt
                                                                                        -105,100,000  -300,000 -2,600,000 -1,200,000 
          net (decrease) in cash
                                                                                        -700,000  -1,300,000 -1,200,000 -2,800,000 
          bad debt expense
                                                                                             
          cumulative effect of accounting changes
                                                                                             
          reversals of reserves to operations
                                                                                             
          cash from financing activities, net of acquisitions:
                                                                                             
          issuance of 9 7/8% senior secured notes due 2013
                                                                                             
          issuance of 9 7/8% senior discount notes due 2014
                                                                                             
          redemption of 9 7/8% senior subordinated notes due 2007
                                                                                             
          net cash (used in) investing activities
                                                                                            -3,500,000 
          net cash (used in) financing activities
                                                                                            -2,600,000