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Other Operating Charges, net (Tables) | 9 Months Ended
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Sep. 30, 2021
Other Income and Expenses [Abstract] |
Schedule of Other Operating Cost and Expense, by Component [Table Text Block] |
| Quarter Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Costs associated with mill closure | $ | 5.4 |  |  | $ | — |  |  | $ | 47.1 |  |  | $ | — |
Reorganization and other expenses | 3.4 |  |  | — |  |  | 7.3 |  |  | 3.4 |
Union settlement | — |  |  | — |  |  | — |  |  | 6.6 |
Gain on divested assets | — |  |  | — |  |  | — |  |  | (1.4) |
Directors' equity-based compensation | 1.4 |  |  | 0.3 |  |  | 0.6 |  |  | 2.5 |
Other | — |  |  | — |  |  | — |  |  | 0.8 |
| $ | 10.2 |  |  | $ | 0.3 |  |  | $ | 55.1 |  |  | $ | 11.9 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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