Retirement Plans - Weighted Average Assumptions Used in Calculating Benefit Obligation (Details)	Dec. 31, 2016	Dec. 31, 2015
United States
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.00%	4.25%
Rate of compensation increase	0.00%	0.00%
International
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	1.60%	2.40%
Rate of compensation increase	0.00%	3.00%