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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Translation loss on long-term intercompany loans, net of income taxes of $19.1 on both dates |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | $ 19.2 | $ 19.1
Gain (Loss) on derivative instruments, net of income tax benefit of $0 and $(4.8), respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | (12.4) | (0.7)
Gain on interest rate swap, net of income taxes of $0.4 on both dates |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | 0.2 | 0.2
Defined benefit pension plans, net of income tax benefit of $0 and $(20.1), respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | (18.9) | (20.6)
Retiree health care plan, net of income taxes of $0 and $2.0, respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | $ 2.1 | $ 2.1

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