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Share-based payments - Narrative (Details)
12 Months Ended
Dec. 31, 2022
shares
Dec. 31, 2021
shares
Dec. 31, 2020
shares
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) 1,028,161 1,108,211  
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) 3,124,187 3,085,667 2,973,393
DSU      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of outstanding shares (in shares) 3,321,167 3,365,433  
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) 4,484,643    
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