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Postretirement and Other Benefits - Weighted Average Assumption of Projected Benefit Obligations (Details) - Pension Benefits
Dec. 31, 2020
Dec. 31, 2019
United States    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 2.30% 3.20%
Rate of compensation increase 0.00% 0.00%
France    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 0.32% 0.53%
Rate of compensation increase 1.97% 1.96%