v3.26.1
Other Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (loss), net of tax $ 470.7 $ 472.3 $ 498.7 $ 416.6 $ 428.2 $ 858.5
Accumulated other comprehensive income (loss), net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (loss), net of tax (6.3) $ (4.9) 4.0 $ 12.5 $ 11.2 $ 13.1
Accumulated pension and Other Post-Employment Benefits ("OPEB") liability adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (loss), net of tax (28.1)   (28.6)      
Accumulated unrealized gain on derivative instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (loss), net of tax 1.2   1.6      
Accumulated unrealized foreign currency translation adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (loss), net of tax $ 20.6   $ 31.0