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Employee Benefit Plans - Actuarial Assumptions to Determind Funded Status (Details)
Dec. 31, 2018
Dec. 31, 2017
United States    
Summary of weighted-average actuarial assumptions used in determining funded status    
Discount rate 4.35% 3.70%
Rate of increase in compensation levels 3.00% 3.00%
Foreign Plan    
Summary of weighted-average actuarial assumptions used in determining funded status    
Discount rate 3.04% 2.70%
Rate of increase in compensation levels 3.08% 3.10%