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Non-operating Income (Expense) (Tables) | 9 Months Ended
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Sep. 30, 2021
Nonoperating Income (Expense) [Abstract] |
Schedule of Other Nonoperating Income (Expense) [Table Text Block] |
| Quarter Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Interest expense | $ | (8.5) |  |  | $ | (11.7) |  |  | $ | (26.9) |  |  | $ | (35.4) |
Capitalized interest | 0.1 |  |  | — |  |  | 0.2 |  |  | — |
Amortization of debt issuance costs | (0.5) |  |  | (0.5) |  |  | (1.4) |  |  | (1.7) |
Interest income | — |  |  | — |  |  | 0.6 |  |  | — |
Interest expense, net | (8.9) |  |  | (12.2) |  |  | (27.5) |  |  | (37.0) |
Debt retirement costs | (0.5) |  |  | (3.9) |  |  | (0.5) |  |  | (4.8) |
Non-operating pension and other postretirement employee benefits expense | (2.8) |  |  | (1.9) |  |  | (7.8) |  |  | (5.7) |
Total non-operating expense | $ | (12.2) |  |  | $ | (17.9) |  |  | $ | (35.7) |  |  | $ | (47.5) |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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