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Share capital - Disclosure of dividends (Details) - CAD ($)
$ / shares in Units, shares in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.22 $ 0.21
Dividend payable $ 40,574,000 $ 35,085,000
February 24, 2022 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.055  
Dividend payable $ 10,167,000  
Dividend reinvestment plan 7,498,987  
May 12, 2022 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.055  
Dividend payable $ 10,177,000  
Dividend reinvestment plan 7,385,458  
August 9, 2022 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.055  
Dividend payable $ 10,109,000  
Dividend reinvestment plan 7,780,634  
November 9, 2022 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.055  
Dividend payable $ 10,121,000  
Dividend reinvestment plan 6,686,671  
February 21, 2021 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.05
Dividend payable   $ 8,364,000
Dividend reinvestment plan   8,989,709
May 11, 2021 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.05
Dividend payable   $ 8,404,000
Dividend reinvestment plan   7,102,627
August 8, 2021 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.055
Dividend payable   $ 9,160,000
Dividend reinvestment plan   8,005,584
November 9, 2021 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.055
Dividend payable   $ 9,157,000
Dividend reinvestment plan   7,891,496