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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
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