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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Pre-tax | $ 78.1 | $ (49.8) | $ (50.0)
Total other comprehensive income (loss), Tax | 2.3 | (6.8) | (6.1)
Other comprehensive income (loss) | 80.4 | (56.6) | (56.1)
Cumulative translation adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Pre-tax | 87.8 | (74.9) | (75.6)
Total other comprehensive income (loss), Tax | 0.0 | 0.0 | 0.0
Other comprehensive income (loss) | 87.8 | (74.9) | (75.6)
Net (loss) gain arising during the year |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Pre-tax | (8.2) | 24.6 | 12.0
Total other comprehensive income (loss), Tax | 1.9 | (6.7) | (2.9)
Other comprehensive income (loss) | (6.3) | 17.9 | 9.1
Amortization and settlement gain |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Pre-tax | (1.5) | 0.5 | 10.3
Total other comprehensive income (loss), Tax | 0.4 | (0.1) | (2.4)
Other comprehensive income (loss) | (1.1) | 0.4 | 7.9
Pension and other postretirement adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Pre-tax | (9.7) | 25.1 | 22.3
Total other comprehensive income (loss), Tax | 2.3 | (6.8) | (5.3)
Other comprehensive income (loss) | (7.4) | 18.3 | 17.0
Reclassification adjustments for derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Pre-tax | 0.0 | 0.0 | 3.3
Total other comprehensive income (loss), Tax | 0.0 | 0.0 | (0.8)
Other comprehensive income (loss) | $ 0.0 | $ 0.0 | 2.5
Reclassification adjustments for derivatives | Acceleration Due to Cash Settlement on Derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) |  |  | $ 1.3

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