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Share-based compensation - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
performanceFactor
shares
Dec. 31, 2022
USD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares reserved for future grants of stock options and share appreciation rights (in shares) | shares 4,010,076  
Liabilities from share-based payment transactions $ 74,107 $ 70,569
SARs and TSARs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period 7 years  
Vesting rate 33.33%  
Fair value of share-based payment transactions $ 26,700  
Liabilities from share-based payment transactions 25,000  
Intrinsic value of liabilities from share-based payment transactions $ 1,700  
Weighted average remaining vesting period 1 year 4 months 24 days  
Expense from share-based payment transactions with employees $ 10,500 1,800
Expense (recovery) from share-based payment transactions with employees, effect of change in share price $ 6,600 (3,700)
Performance Share Units (PSU) New Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period 3 years  
Number of performance factors | performanceFactor 2  
Performance Share Units (PSU) New Plan | Bottom of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation arrangement vesting rights, percentage 0.00%  
Performance Share Units (PSU) New Plan | Top of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation arrangement vesting rights, percentage 200.00%  
Deferred, Restricted and Performance Share Units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of share-based payment transactions $ 58,600  
Liabilities from share-based payment transactions 48,900  
Intrinsic value of liabilities from share-based payment transactions $ 9,700  
Weighted average remaining vesting period 1 year 8 months 12 days  
Expense from share-based payment transactions with employees $ 23,900 13,500
Expense (recovery) from share-based payment transactions with employees, effect of change in share price $ 8,800 $ (3,400)
Performance shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period 3 years  
Number of performance factors | performanceFactor 2  
Return on capital employed average period 3 years  
Performance shares | Bottom of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation arrangement vesting rights, percentage 0.00%  
Performance shares | Top of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation arrangement vesting rights, percentage 200.00%