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Employee benefit obligations - Plan Asset Composition (Details)
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [abstract]    
Cash and cash equivalents 5.90% 0.60%
Debt instruments 21.90% 28.40%
Equity instruments 33.50% 31.50%
Real estate 21.30% 23.00%
Mortgages 3.60% 0.00%
Alternative assets 13.80% 16.50%
Total 100.00% 100.00%