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Employee benefit obligations - Plan Asset Composition (Details)
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [abstract]    
Cash and equivalent 0.90% 2.50%
Debt instruments 28.00% 24.90%
Equity instruments 30.80% 32.90%
Real estate 22.80% 19.60%
Mortgages 0.00% 4.70%
Alternative assets 17.50% 15.40%
Total 100.00% 100.00%