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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Gain (loss) on derivative instruments, net of income tax benefit of $(0.7) and $(22.7), respectively    
Accumulated Other Comprehensive Income Loss [Line Items]    
Accumulated other comprehensive loss, income taxes $ (0.7) $ (22.7)
Accumulated Gain Loss Net Cash Flow Hedge Parent Member    
Accumulated Other Comprehensive Income Loss [Line Items]    
Accumulated other comprehensive loss, income taxes 19.1 19.1
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income tax benefit of $(20.6) and $(23.0), respectively    
Accumulated Other Comprehensive Income Loss [Line Items]    
Accumulated other comprehensive loss, income taxes (20.6) (23.0)
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $2.1 and $2.0, respectively    
Accumulated Other Comprehensive Income Loss [Line Items]    
Accumulated other comprehensive loss, income taxes 2.1 2.0
Gain on interest rate swap, net of income taxes of $0.2 and $0.3, respectively    
Accumulated Other Comprehensive Income Loss [Line Items]    
Accumulated other comprehensive loss, income taxes $ 0.2 $ 0.3