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Share-based compensation - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
performanceFactor
shares
Dec. 31, 2021
USD ($)
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 3,852,797  
Liabilities from share-based payment transactions $ 70,569 $ 68,634
SARs and TSARs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 7 years  
Vesting rate 33.33%  
Fair value of share-based payment transactions $ 23,000  
Liabilities from share-based payment transactions 22,100  
Intrinsic value of liabilities from share-based payment transactions $ 900  
Weighted average remaining vesting period 1 year 4 months 24 days  
Expense (recovery) from share-based payment transactions with employees $ 1,800 (13,500)
Recovery from share-based payment transactions with employees, effect of change in share price $ 3,700 20,500
Performance Share Units (PSU) New Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 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 $ 55,700  
Liabilities from share-based payment transactions 48,300  
Intrinsic value of liabilities from share-based payment transactions $ 7,400  
Weighted average remaining vesting period 1 year 7 months 6 days  
Expense (recovery) from share-based payment transactions with employees $ 13,500 12,200
Recovery from share-based payment transactions with employees, effect of change in share price $ 3,400 2,300
Stock Options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 7 years  
Vesting rate 33.33%  
Expense (recovery) from share-based payment transactions with employees $ 100 $ 100
Performance shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 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%