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Other Operating Charges, net (Tables) | 12 Months Ended
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Dec. 31, 2023
Other Income and Expenses [Abstract] |
Schedule of Other Operating Cost and Expense, by Component [Table Text Block] | The major components of “Other operating charges, net” in the Consolidated Statements of Operations are:
| Years Ended December 31,
| 2023 | 2022 | 2021
Costs associated with mill closure | $ | — |  | $ | 0.4 |  | $ | 50.0 |
Reorganization and other expenses | 1.8 |  | 1.6 |  | 8.4 |
Miscellaneous environmental accruals | — |  | — |  | (1.8) |
Impairment of equipment | 2.1 |  | 6.1 |  | — |
Directors' equity-based compensation expense | 0.9 |  | 0.9 |  | 1.1 |
Other | 0.4 |  | 0.7 |  | — |
| $ | 5.3 |  | $ | 9.7 |  | $ | 57.7 |

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- Definition Tabular disclosure of each detailed component of other operating costs and expenses that are applicable to sales and revenues, but not included in the cost of sales in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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