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Other Comprehensive Loss - Components of Accumulated Comprehensive Income (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ 628.5 $ 607.4 $ 597.7 $ 574.8 $ 572.6 $ 557.9
Accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (128.2) $ (137.0) (122.6) $ (135.1) $ (121.7) $ (124.5)
Net gain (loss) on pension and OPEB liability adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (22.2)   (24.3)      
Accumulated other comprehensive loss, tax benefit 12.0   12.8      
Unrealized gain (loss) on derivative instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (15.5)   (3.5)      
Accumulated other comprehensive loss, tax benefit 3.9   1.6      
Unrealized gain (loss) on foreign currency translation            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (90.5)   (94.8)      
Accumulated other comprehensive loss, tax benefit $ 8.8   $ 5.0