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Pension and Postretirement Benefits - Weighted-Average Assumptions Used to Determine Benefit Obligations (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Foreign Pension Plans    
Weighted-average assumptions used to determine benefit obligations    
Discount rate 3.15% 3.52%
Rate of compensation increase 2.26% 2.34%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 3.71% 3.77%
Expected return on plan assets 5.09% 4.53%
Rate of compensation increase 2.26% 2.34%
Pension Plans | Domestic Plans | Funded Plans    
Weighted-average assumptions used to determine benefit obligations    
Discount rate 3.63% 4.12%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 4.07% 4.33%
Expected return on plan assets 5.50% 2.25%
Pension Plans | Domestic Plans | Unfunded Pension Plans    
Weighted-average assumptions used to determine benefit obligations    
Discount rate 3.55% 3.99%
Rate of compensation increase 3.00% 3.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 3.99% 4.25%
Rate of compensation increase 3.00% 3.00%
Postretirement Benefit Plans | Domestic Plans    
Weighted-average assumptions used to determine benefit obligations    
Discount rate 3.59% 4.08%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 4.08% 4.30%
Expected return on plan assets 0.00% 0.00%