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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ 682.2 $ 649.6 $ 597.7 $ 557.9
Accumulated pension and OPEB liability adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, income tax benefit 8.9 11.6    
Accumulated other comprehensive loss (14.4) (20.5)    
Accumulated unrealized loss on derivative instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, income tax benefit 2.1 2.8    
Accumulated other comprehensive loss (1.9) (13.1)    
Accumulated unrealized foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, income tax benefit 9.5 10.1    
Accumulated other comprehensive loss (102.7) (78.3)    
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ (119.0) $ (111.9) $ (122.6) $ (124.5)