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Summary of Significant Accounting Policies - Changes in the Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | $ 135.0 | $ 37.5 | $ (3.0)
Tax | (0.5) | (13.9) | (4.1)
Other comprehensive income (loss) | 134.5 | 23.6 | (7.1)
Pension and OPEB liability adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | (11.2) | 9.9 | 8.9
Tax | 1.8 | (6.4) | (2.8)
Other comprehensive income (loss) | (9.4) | 3.5 | 6.1
Derivative instrument adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | (16.6) | 61.3 | 11.9
Tax | 0.1 | (15.0) | (0.7)
Other comprehensive income (loss) | (16.5) | 46.3 | 11.2
Foreign currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | 35.4 | (33.7) | (23.8)
Tax | 0.1 | 7.5 | (0.6)
Other comprehensive income (loss) | 35.5 | (26.2) | (24.4)
Reclassification of foreign currency translation to income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | 127.4 | 0.0 | 0.0
Tax | (2.5) | 0.0 | 0.0
Other comprehensive income (loss) | $ 124.9 | $ 0.0 | $ 0.0

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