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Pensions - Additional Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer $ 2.7 $ 3.1
Estimated future employer contributions in current year 5.0  
Non-U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer 0.4 $ 0.7
Estimated future employer contributions in current year $ 0.9