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Other Comprehensive (Loss) Income - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pre-tax |  |  |
Other comprehensive income (loss), pre-tax | $ (50.0) | $ 115.2 | $ 1.8
Tax |  |  |
Total other comprehensive income (loss), tax | (6.1) | (1.4) | 0.1
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Total other comprehensive income (loss), net of tax | (56.1) | 113.8 | 1.9
Cumulative translation adjustment |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) before reclassifications, before tax |  |  | 0.1
Other comprehensive income (loss), pre-tax | (75.6) | 107.8 |
Tax |  |  |
Total other comprehensive income (loss), tax | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Total other comprehensive income (loss), net of tax | (75.6) | 107.8 |
Net gain (loss) arising during the year |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) before reclassifications, before tax | 12.0 | (1.5) | (7.4)
Tax |  |  |
Other comprehensive income (loss) before reclassifications, tax | (2.9) | 0.1 | 2.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Other comprehensive income (loss) before reclassifications, net of tax | 9.1 | (1.4) | (5.0)
Amortization and settlement loss, net of curtailment gain |  |  |
Pre-tax |  |  |
Reclassifications from AOCI before tax | 10.3 | 2.9 | 2.8
Tax |  |  |
Reclassification from AOCI, tax | (2.4) | (0.1) | (0.9)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Reclassification from AOCI, net of tax | 7.9 | 2.8 | 1.9
Pension and other postretirement adjustments |  |  |
Pre-tax |  |  |
Other comprehensive income (loss), pre-tax | 22.3 | 1.4 | (4.6)
Tax |  |  |
Total other comprehensive income (loss), tax | (5.3) | 0.0 | 1.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Total other comprehensive income (loss), net of tax | 17.0 | 1.4 | (3.1)
Reclassification adjustments for derivatives |  |  |
Pre-tax |  |  |
Other comprehensive income (loss), pre-tax | 3.3 | 6.0 | 6.3
Tax |  |  |
Total other comprehensive income (loss), tax | (0.8) | (1.4) | (1.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Total other comprehensive income (loss), net of tax | $ 2.5 | $ 4.6 | $ 4.9

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