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Post-employment Benefits - Actuarial assumptions (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Post-employment Benefits    
Actuarial assumption of retirement age 65 years 65 years
Discount rate (as a percent) 7.02% 8.37%
Salary scale (as a percent) 5.00% 5.20%
Inflation rate (as a percent) 3.50% 3.70%