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Other Comprehensive Income - Components of Accumulated Comprehensive Income (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ 574.8 $ 572.6 $ 557.9 $ 568.7 $ 542.5 $ 546.7
Accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (135.1) $ (121.7) (124.5) $ (114.2) $ (111.6) $ (89.4)
Net gain (loss) on pension and OPEB liability adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (26.6)   (28.2)      
Accumulated other comprehensive loss, tax benefit 12.1   11.4      
Unrealized (loss) gain on derivative instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (5.0)   (0.6)      
Accumulated other comprehensive loss, tax benefit 2.8   1.6      
Unrealized (loss) gain on foreign currency translation            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (103.5)   (95.7)      
Accumulated other comprehensive loss, tax benefit $ 2.6   $ 1.7