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Share-based compensation - Weighted average assumptions (Details) - SARs and TSARs - $ / shares
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Risk-free interest rate 3.50% 4.20%
Expected dividend yield 1.90% 1.50%
Expected life of SARs and TSARs (years) 1 year 8 months 12 days 1 year 6 months
Expected volatility 39.00% 35.00%
Expected forfeitures 0.00% 0.00%
Weighted average fair value (in usd per unit) $ 7.69 $ 12.16