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Pension Plans and Other Benefits - Fair Value Assumption - North American Pension Plans
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
The assumptions used to determine benefit obligations were as follows:      
Discount rate 2.40% 3.12% 4.09%
Expected return on plan assets 3.89% 5.13% 5.14%
Rate of compensation increase 3.00% 3.00% 3.50%
The assumptions used to determine net benefit cost were as follows:      
Discount rate 3.12% 4.09% 3.51%
Service cost discount rate 3.15% 4.00% 3.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate 2.83% 3.77% 3.21%
Expected return on plan assets 4.88% 5.14% 5.54%
Rate of compensation increase 3.00% 3.50% 3.50%