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Share-based compensation - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
performanceFactor
shares
Dec. 31, 2023
USD ($)
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 4,211,772  
Liabilities from share-based payment transactions $ 73,547 $ 74,107
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 $ 28,100  
Liabilities from share-based payment transactions 25,300  
Intrinsic value of liabilities from share-based payment transactions $ 2,800  
Weighted average remaining vesting period 1 year 6 months  
Expense from share-based payment transactions with employees $ 3,900 10,500
Expense (recovery) from share-based payment transactions with employees, effect of change in share price $ (1,800) (6,600)
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 $ 60,500  
Liabilities from share-based payment transactions 48,500  
Intrinsic value of liabilities from share-based payment transactions $ 12,000  
Weighted average remaining vesting period 1 year 8 months 12 days  
Expense from share-based payment transactions with employees $ 19,900 23,900
Expense (recovery) from share-based payment transactions with employees, effect of change in share price $ 4,300 $ 8,800
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%