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Other Comprehensive Income - Components of Accumulated Comprehensive Income (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ 572.6 $ 562.1 $ 557.9 $ 542.5 $ 562.1 $ 546.7
Accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (121.7) $ (123.8) (124.5) $ (111.6) $ (78.6) $ (89.4)
Net gain (loss) on pension and OPEB liability adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (26.7)   (28.2)      
Accumulated other comprehensive loss, tax benefit 12.7   11.4      
Unrealized (loss) gain on derivative instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (2.0)   (0.6)      
Accumulated other comprehensive loss, tax benefit 1.7   1.6      
Unrealized gain (loss) on foreign currency translation            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (93.0)   (95.7)      
Accumulated other comprehensive loss, tax benefit $ 4.1   $ 1.7