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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

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- Definition The amount of dividends that the company has declared but not yet paid. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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