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Other Comprehensive Income/(Loss) - Components of Accumulated Comprehensive Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, net of tax $ 1,132.9 $ 694.5 $ 682.2 $ 635.7 $ 653.0 $ 649.6
Accumulated other comprehensive loss, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, net of tax (157.9) $ (96.5) (119.0) $ (123.9) $ (106.3) $ (111.9)
Pension and OPEB liability adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, tax benefit (expense) 7.1   8.9      
Accumulated other comprehensive loss, net of tax (12.7)   (14.4)      
Derivative instrument adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, tax benefit (expense) (8.3)   2.1      
Accumulated other comprehensive loss, net of tax 52.7   (1.9)      
Unrealized foreign currency adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, tax benefit (expense) 7.7   9.5      
Accumulated other comprehensive loss, net of tax $ (197.9)   $ (102.7)