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Pensions - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Employer contributions $ 7.0 $ 3.9
Non-U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Employer contributions 1.0 $ 0.7
Estimated employer contributions remaining in current year $ 0.3