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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss $ 2,177.7 $ 2,145.9 $ 2,187.7 $ 2,234.1 $ 2,413.3 $ 2,449.8 $ 2,509.4 $ 2,458.1
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 0.8     1.1        
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 (37.2)     (36.0)        
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 0.8     1.3        
Foreign currency translation                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss (255.4)     (261.2)        
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 (133.8)     (133.6)        
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 (45.1)     (37.6)        
Accumulated other comprehensive loss                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss $ (469.9) $ (500.4) $ (495.5) $ (466.0) $ (483.1) $ (459.5) $ (451.6) $ (458.7)