Pension Plans - Weighted Average Assumptions Used to Determine Net Periodic Pension Cost (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.73%	3.83%
Expected return on plan assets	5.75%	5.75%
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.16%	2.12%	2.96%
Expected return on plan assets	3.48%	3.54%	4.29%
Rate of compensation increase	2.39%	3.03%	2.91%