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Other Comprehensive Income (Loss) - Components of Accumulated Comprehensive Income (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ 653.0 $ 652.9 $ 649.6 $ 607.4 $ 592.0 $ 597.7
Accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (106.3) $ (115.7) (111.9) $ (137.0) $ (138.3) $ (122.6)
Net gain (loss) on pension and OPEB liability adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (18.0)   (20.5)      
Accumulated other comprehensive loss, tax benefit 11.7   11.6      
Unrealized (loss) gain on derivative instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (9.5)   (13.1)      
Accumulated other comprehensive loss, tax benefit 2.6   2.8      
Unrealized gain (loss) on foreign currency translation            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (78.8)   (78.3)      
Accumulated other comprehensive loss, tax benefit $ 6.8   $ 10.1