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Accumulated Other Comprehensive Loss (AOCL) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive loss before income tax effect $ (104.8) $ (99.4)
Income tax effect 6.1 7.7
Accumulated other comprehensive loss (98.7) (91.7)
Defined benefit plan liabilities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive loss before income tax effect (107.3) (102.1)
Income tax effect 6.6 8.2
Unrealized gain (loss) on financial instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive loss before income tax effect 2.5 2.7
Income tax effect $ (0.5) $ (0.5)