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Share-based compensation - Weighted average assumptions (Details) - SARs and TSARs - $ / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Risk-free interest rate 4.20% 4.50%
Expected dividend yield 1.50% 1.60%
Expected life of SARs and TSARs (years) 1 year 6 months 1 year 4 months 24 days
Expected volatility 35.00% 38.00%
Expected forfeitures 0.00% 0.00%
Weighted average fair value (in usd per unit) $ 12.16 $ 10.75