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Share-based payments - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
shares
Dec. 31, 2022
shares
Dec. 31, 2021
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of common shares for every one deferred share unit (in shares) 1    
Share-based compensation arrangement by share-based payment award, threshold trading period 5 days    
ESP      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting period 2 years    
Number of shares authorized (in shares) 4,360,087    
Number of unvested shares (in shares) 1,077,613 1,028,161  
RSUs/PSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting period 3 years    
Number of outstanding shares (in shares) 3,412,812 3,124,187 3,085,667
DSU      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of outstanding shares (in shares) 3,573,182 3,321,167  
Stock Options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting period 3 years    
Number of shares authorized (in shares) 4,496,051    
Top of range | ESP      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Maximum employee contribution rate 12.00%    
Maximum employer contribution rate 2.00%    
Top of range | Stock Options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award exercise period 10 years    
Bottom of range | DSU      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Percent of employee compensation paid in DSUs after minimum share ownership requirement 50.00%    
Bottom of range | Stock Options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award exercise period 7 years