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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $13.8 million and $17.6 million at December 31, 2017 and 2016, respectively $ (24.9) $ (36.5)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $0.2 million and $3.0 million at December 31, 2017 and 2016, respectively 0.4 (1.9)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $4.5 million and $0.0 million at December 31, 2017 and 2016, respectively (64.9) (100.9)
Accumulated other comprehensive loss (89.4) (139.3)
Accumulated pension and OPEB tax 13.8 17.6
Accumulated tax on gain (loss) on financial instruments 0.2 3.0
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax $ 4.5 $ 0.0