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Pensions Benefit Plans and Other Postretirement Benefits - Weighted Average Assumptions (Details) - Funded Plan
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted average assumptions used to determine net periodic pension costs and net postretirement benefit cost      
Tenure used for computing historical long-term rate of return assumption 10 years    
Pension Benefit Plans | U.S.      
Weighted average assumptions used to determine pension and accumulated postretirement benefit obligations      
Discount rate used to determine pension and accumulated postretirement benefit obligations (as a percent) 2.61% 3.39%  
Weighted average assumptions used to determine net periodic pension costs and net postretirement benefit cost      
Discount rate used to determine net periodic pension costs and net postretirement benefit cost (as a percent) 3.39% 4.36% 3.69%
Expected long-term rate of return on assets (as a percent) 7.15% 7.25% 7.25%
Pension Benefit Plans | Non-U.S.      
Weighted average assumptions used to determine pension and accumulated postretirement benefit obligations      
Discount rate used to determine pension and accumulated postretirement benefit obligations (as a percent) 1.92% 2.53%  
Rate of compensation increase (as a percent) 2.80% 2.89%  
Weighted average assumptions used to determine net periodic pension costs and net postretirement benefit cost      
Discount rate used to determine net periodic pension costs and net postretirement benefit cost (as a percent) 2.53% 3.01% 2.76%
Rate of compensation increase (as a percent) 2.86% 2.76% 2.78%
Expected long-term rate of return on assets (as a percent) 5.23% 5.50% 5.52%
Other Post-retirement Benefits | U.S.      
Weighted average assumptions used to determine pension and accumulated postretirement benefit obligations      
Discount rate used to determine pension and accumulated postretirement benefit obligations (as a percent) 2.48% 3.31% 4.30%
Weighted average assumptions used to determine net periodic pension costs and net postretirement benefit cost      
Discount rate used to determine net periodic pension costs and net postretirement benefit cost (as a percent) 3.31% 4.30% 3.61%
Other Post-retirement Benefits | Non-U.S.      
Weighted average assumptions used to determine pension and accumulated postretirement benefit obligations      
Discount rate used to determine pension and accumulated postretirement benefit obligations (as a percent) 2.55% 3.00% 3.60%
Weighted average assumptions used to determine net periodic pension costs and net postretirement benefit cost      
Discount rate used to determine net periodic pension costs and net postretirement benefit cost (as a percent) 3.00% 3.60% 3.35%