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Share-based compensation (Narrative) (Details)
 12 Months Ended
Dec. 31, 2022
CAD ($)
Month
shares
$ / shares
Dec. 31, 2021
CAD ($)
Month
shares
$ / shares
Dec. 31, 2019
$ / shares
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average share price $ 16.26 $ 16.04  
Share-based compensation related to share options | $ $ 2,700,000 $ 3,000,000  
Number of share options granted | shares 684,100 763,700  
Weighted average exercise price of share options granted $ 14.25 $ 13.27  
Expected life | Month 47 46  
Deferred share units [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average value of deferred share units granted $ 14.71 $ 15.54  
Restricted share units ("RSU") [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average value of restricted share units granted $ 14.26 $ 13.24  
Number of restricted stock units forfeited | shares   215,812  
Restricted share units ("RSU") [Member] | Officers [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of restricted stock units granted | shares     150,000
Weighted average value of restricted share units granted     $ 12.7
Vesting period     3 years
Additional number of restricted stock units granted | shares   75,000  
Weighted average value of restricted share units granted   $ 12.7  
Common shares acquired by an officer | shares     75,000
DSU and RSU [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation | $ $ 4,500,000 $ 4,700,000  
Closing price of the common shares | $ $ 16.32    
Marginal income tax rate 53.30%    
Employees tax obligations settlement amount related to vested RSU and DSU | $ $ 3,100,000 2,600,000  
Employees tax obligations settlement amount related to outstanding RSU and DSU | $ $ 11,200,000 $ 10,400,000