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Retirement benefits obligations - Assumptions (Details)
Dec. 31, 2019
Dec. 31, 2018
Actuarial assumptions    
Discount rate 0.20% 0.90%
Salary growth rate 1.00% 1.00%
Pension growth rate 0.00% 0.00%
Discount rate    
Actuarial assumptions    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption, percentage (4.47%) (4.38%)
Percentage of reasonably possible decrease in actuarial assumption (0.25%) (0.25%)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption, percentage 5.22% 4.74%
Interest rates on retirement savings capital    
Actuarial assumptions    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption, percentage 0.59% 1.19%
Percentage of reasonably possible decrease in actuarial assumption (0.25%) (0.25%)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption, percentage (0.53%) (1.16%)
Salaries    
Actuarial assumptions    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption, percentage 0.03% 0.18%
Percentage of reasonably possible decrease in actuarial assumption (0.25%) (0.25%)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption, percentage (0.02%) (0.18%)
Life expectancy    
Actuarial assumptions    
Period of reasonably possible increase in actuarial assumption 1 year 1 year
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption, percentage 1.86% 1.55%
Period of reasonably possible decrease in actuarial assumption 1 year 1 year
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption, percentage (1.92%) (1.56%)