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Payroll, staff and employee benefits obligations - Type of assets (Details) - Pension benefits
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Asset allocation      
Equity securities 25.00% 25.00% 24.00%
Debt securities 45.00% 46.00% 47.00%
Monetary 2.00% 1.00% 1.00%
Annuity contracts 20.00% 20.00% 20.00%
Real estate 8.00% 8.00% 8.00%