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Share capital - Disclosure of dividends (Details) - CAD ($) $ / shares in Units, shares in Thousands | 12 Months Ended
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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

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