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Share-based compensation - Weighted average assumptions (Details) - SARs and TSARs - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Risk-free interest rate 4.40% 0.70%
Expected dividend yield 1.90% 1.30%
Expected life of SARs and TSARs (years) 1 year 9 months 18 days 1 year 8 months 12 days
Expected volatility 51.00% 51.00%
Expected forfeitures 0.00% 0.00%
Weighted average fair value (USD per unit) $ 8.72 $ 8.81