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Share-based compensation (Narrative) (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Weighted average share price $ 19.56 $ 16.26
Share-based compensation related to share options $ 4,200,000 $ 2,700,000
Deferred share units [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Weighted average value of deferred share units granted $ 21.16 $ 14.71
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 $ 17.87 $ 14.26
DSU and RSU [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation $ 6,200,000 $ 4,500,000
Closing price of the common shares $ 18.91  
Marginal income tax rate 53.30%  
Employees tax obligations settlement amount related to vested RSU and DSU $ 3,700,000 3,100,000
Employees tax obligations settlement amount related to outstanding RSU and DSU $ 11,400,000 $ 11,200,000