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Payroll, staff and employee benefits obligations - Type of assets (Details) - Pension benefits
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Asset allocation      
Equity securities 26.00% 39.00% 25.00%
Debt securities 46.00% 35.00% 45.00%
Monetary 3.00% 1.00% 2.00%
Annuity contracts 17.00% 17.00% 20.00%
Real estate 8.00% 8.00% 8.00%