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Pensions - Summary of Components of Net Postretirement Pensions Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 1.9 $ 2.0
Defined Benefit Plan, Amortization of Gains (Losses) 0.6 1.4
Expected return on plan assets (2.4) (2.6)
Net postretirement pension expense 0.1 0.8
Non-U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 0.3 0.5
Defined Benefit Plan, Amortization of Gains (Losses) 0.2 0.2
Expected return on plan assets (0.5) (0.6)
Net postretirement pension expense $ 0.0 $ 0.1