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Post-employment benefits for associates - Weighted average actuarial assumptions (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension plans [member]    
Disclosure of defined benefit plans [line items]    
Discount rate 1.70% 2.20%
Expected rate of pension increase 1.20% 1.10%
Expected rate of salary increase 3.30% 2.80%
Interest on savings account 1.00% 0.80%
Current average life expectancy for a 65-year-old male (in years) 21 years 21 years
Current average life expectancy for a 65-year-old female (in years) 24 years 23 years
Other post-employment benefit plans [member]    
Disclosure of defined benefit plans [line items]    
Discount rate 3.30% 4.30%
Expected rate of pension increase
Expected rate of salary increase
Interest on savings account
Current average life expectancy for a 65-year-old male (in years) 21 years 21 years
Current average life expectancy for a 65-year-old female (in years) 23 years 23 years