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Other Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income, net of tax $ 397.4 $ 416.6 $ 858.5 $ 882.3 $ 898.0 $ 949.1
Accumulated other comprehensive income, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income, net of tax 0.2 $ 12.5 13.1 $ 36.7 $ 28.3 $ 39.1
Accumulated pension and OPEB liability adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, income tax benefit (expense) 4.8   4.7      
Accumulated other comprehensive income, net of tax (28.9)   (20.7)      
Accumulated unrealized gain on derivative instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, income tax benefit (expense) (10.2)   10.2      
Accumulated other comprehensive income, net of tax 4.8   19.9      
Accumulated unrealized foreign currency translation adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, income tax benefit (expense) 15.5   14.6      
Accumulated other comprehensive income, net of tax $ 24.3   $ 13.9