| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|---|
| Period End Date | 12/31/2025 | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 |
|---|
| Sales | 1,879.30 | 2,092.10 | 2,154.20 | 1,980.50 | 1,678.60 | 1,669.10 | 1,772.80 | 1,710.20 | 1,475.50 | 1,416.20 |
| Total Revenues | 1,879.30 | 2,092.10 | 2,154.20 | 1,980.50 | 1,678.60 | 1,669.10 | 1,772.80 | 1,710.20 | 1,475.50 | 1,416.20 |
| Cost of sales | 1,431.50 | 1,669.50 | 1,729.70 | 1,635.90 | 1,344.50 | 1,308.70 | 1,430.00 | 1,375.10 | 1,154.10 | 1,127.90 |
| Depreciation and amortization | 73.60 | 67.50 | 57.00 | 56.10 | 57.70 | 54.10 | 55.10 | 50.80 | 49.80 | 52.90 |
| Goodwill impairment | -- | -- | -- | -- | -- | -- | -- | -- | 0.00 | 0.00 |
| Selling, general and administrative expenses | 154.90 | 179.30 | 174.10 | 153.30 | 148.90 | 143.10 | 150.90 | 161.60 | 133.30 | 131.00 |
| Loss on pension settlement | -- | -- | -- | -- | -- | -- | -- | -- | 10.00 | -- |
| Restructuring and impairment charges | 51.90 | 16.90 | 0.00 | 0.00 | 2.20 | 6.50 | 6.00 | 4.00 | 16.20 | 20.10 |
| Loss on sale of assets | 0.40 | (10.70) | 1.80 | 2.50 | 31.20 | 0.00 | 0.00 | (8.30) | -- | -- |
| Gain on sale of business | -- | -- | -- | -- | -- | -- | -- | -- | 0.00 | 2.10 |
| Operating Income (Loss) | 167.80 | 148.20 | 195.20 | 137.70 | 156.50 | 156.70 | 130.80 | 110.40 | 112.10 | 86.40 |
| Interest expense | 66.10 | 76.20 | 71.00 | 44.80 | 40.50 | 48.90 | 62.50 | 56.30 | 42.50 | 50.80 |
| Equity in earnings of affiliates | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other income (loss) | 6.60 | 1.30 | 0.40 | 2.50 | 3.60 | 2.30 | 0.60 | 0.70 | 4.00 | 2.90 |
| Loss (gain) on extinguishment of debt | -- | -- | -- | -- | -- | -- | 0.00 | 0.00 | (13.30) | -- |
| Loss on pension settlements | (27.10) | (4.00) | -- | -- | -- | -- | 0.00 | 0.00 | -- | -- |
| Income Before Income Taxes And Minority Interest | 81.20 | 69.30 | 124.60 | 95.40 | 119.60 | 110.10 | 68.90 | 54.80 | 60.30 | 38.50 |
| Current-State | -- | -- | -- | -- | -- | -- | -- | -- | 0.60 | 1.30 |
| Current- Foreign | -- | -- | -- | -- | -- | -- | -- | -- | -- | 13.30 |
| Deferred- Foreign | -- | -- | -- | -- | -- | -- | -- | -- | -- | (0.20) |
| Deferred:Federal | -- | -- | -- | -- | -- | -- | -- | -- | 2.60 | (1.60) |
| Deferred:State | -- | -- | -- | -- | -- | -- | -- | -- | (1.20) | 0.50 |
| Income taxes | 25.20 | 20.70 | 34.80 | 31.60 | 34.50 | 21.00 | 1.40 | 26.00 | 29.00 | 11.40 |
| Current-Federal | -- | -- | -- | -- | -- | -- | -- | -- | 11.10 | (1.90) |
| Minority interest | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Income (loss) from Continuing Operations | -- | 48.60 | 89.80 | 63.80 | 85.10 | 89.10 | 67.50 | 28.80 | 31.30 | 27.10 |
| Income (loss) from discontinued operations, net of tax expense | -- | 0.00 | 0.00 | (0.60) | 0.10 | (3.90) | (0.10) | 0.40 | (0.80) | 0.60 |
| Gain (loss) on sale of Koppers Arch, net of tax expense | -- | -- | -- | -- | (0.30) | 35.80 | -- | -- | -- | -- |
| Gain (loss) on sale of Monessen, net of tax expense | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Income (loss) before cumulative effect of accounting change | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Consolidated Net Income (loss) | 56.00 | 48.60 | 89.80 | 63.20 | 84.90 | 121.00 | 67.40 | 29.20 | 30.50 | 27.70 |
| Net income (loss) attributable to noncontrolling interests | 0.00 | (3.80) | 0.60 | (0.20) | (0.30) | (1.00) | 0.80 | 5.80 | 1.40 | (1.60) |
| Dividends on preferred stock | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income (loss) attributable to Koppers | 56.00 | 52.40 | 89.20 | 63.40 | 85.20 | 122.00 | 66.60 | 23.40 | 29.10 | 29.30 |
| Earnings Per Share (Basic) - Cont Ops | -- | 2.54 | 4.28 | 3.05 | 4.02 | 4.25 | 3.23 | 1.10 | 1.44 | 1.39 |
| Basic earnings (loss) per share before cumulative effect of accounting change | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| EPS (Basic) : Disc Ops | -- | 0.00 | 0.00 | (0.03) | (0.02) | 1.56 | 0.00 | 0.02 | (0.04) | 0.03 |
| Earnings (loss) per common share:Basic | 2.82 | 2.54 | 4.28 | 3.02 | 4.00 | 5.81 | 3.23 | 1.12 | 1.40 | 1.42 |
| Earnings Per Share (Diluted) - Cont Ops | -- | 2.46 | 4.14 | 3.00 | 3.90 | 4.17 | 3.16 | 1.08 | 1.36 | 1.36 |
| Diluted earnings (loss) per share before cumulative effect of accounting change | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings Per Share (Diluted) - Disc Ops | -- | 0.00 | 0.00 | (0.02) | (0.02) | 1.54 | 0.00 | 0.02 | (0.04) | 0.03 |
| Earnings (loss) per common share:Diluted | 2.74 | 2.46 | 4.14 | 2.98 | 3.88 | 5.71 | 3.16 | 1.10 | 1.32 | 1.39 |
| Weighted Average Shares Outstanding (Basic) | 19.86 | 20.66 | 20.84 | 20.98 | 21.24 | 20.99 | 20.67 | 20.87 | 20.75 | 20.64 |
| Weighted Average Shares Outstanding (Diluted) | 20.41 | 21.29 | 21.54 | 21.31 | 21.93 | 21.37 | 21.07 | 21.33 | 22.00 | 21.06 |