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Pensions - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Payments for repurchase of common stock $ 0.0 $ 16.3
U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer 0.9 1.5
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year 5.0  
Non-U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer 0.2 $ 0.4
Estimated future employer contributions in current year $ 0.9