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Other Comprehensive Loss - Components of Accumulated Comprehensive Income (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ 652.9 $ 649.6 $ 592.0 $ 597.7
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (115.7) (111.9) $ (138.3) $ (122.6)
Net gain (loss) on pension and OPEB liability adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (18.8) (20.5)    
Accumulated other comprehensive loss, tax benefit 12.2 11.6    
Unrealized gain (loss) on derivative instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (8.7) (13.1)    
Accumulated other comprehensive loss, tax benefit 2.8 2.8    
Unrealized (loss) gain on foreign currency translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (88.2) (78.3)    
Accumulated other comprehensive loss, tax benefit $ 6.8 $ 10.1