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Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward]    
Unrecognized tax benefits balance at January 1 $ 10.5 $ 29.2
Foreign exchange re-translation 1.0 3.4
Settlement in respect of tax position of prior years (0.3) (15.3)
Unrecognized tax benefits balance at December 31 $ 11.2 $ 10.5