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Share capital - Disclosure of dividends (Details) - CAD ($)
$ / shares in Units, shares in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.210 $ 0.200
Dividend payable $ 35,085,000 $ 32,838,000
February 21, 2021 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.050  
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 $ 0.050  
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  
February 19, 2020 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.050
Dividend payable   $ 7,879,000
Dividend reinvestment plan   24,809,311
May 12, 2020 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.050
Dividend payable   $ 8,259,000
Dividend reinvestment plan   27,492,302
August 5, 2020 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.050
Dividend payable   $ 8,342,000
Dividend reinvestment plan   9,822,963
November 9, 2020 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.050
Dividend payable   $ 8,358,000
Dividend reinvestment plan   11,525,456