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Share-based compensation - Changes in other equity instruments (Details) - shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | 133,418 | 122,947
Number of outstanding units granted (in units) | 19,909 | 23,384
Number of outstanding units performance factor impact on redemption (in units) | 0 | 0
Number of outstanding units granted in lieu of dividends (in units) | 2,434 | 1,074
Number of outstanding units redeemed (in units) | 0 | (13,987)
Number of outstanding units cancelled (in units) | 0 | 0
Number of outstanding units, end of period (in units) | 155,761 | 133,418
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | 332,385 | 228,872
Number of outstanding units granted (in units) | 104,810 | 132,360
Number of outstanding units performance factor impact on redemption (in units) | 0 | 0
Number of outstanding units granted in lieu of dividends (in units) | 5,561 | 2,729
Number of outstanding units redeemed (in units) | (82,039) | (6,103)
Number of outstanding units cancelled (in units) | (19,788) | (25,473)
Number of outstanding units, end of period (in units) | 340,929 | 332,385
Performance share units (PSU) Old Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | 0 | 146,801
Number of outstanding units granted (in units) | 0 | 0
Number of outstanding units performance factor impact on redemption (in units) | 0 | (110,354)
Number of outstanding units granted in lieu of dividends (in units) | 0 | 0
Number of outstanding units redeemed (in units) | 0 | (36,447)
Number of outstanding units cancelled (in units) | 0 | 0
Number of outstanding units, end of period (in units) | 0 | 0
Performance Share Units (PSU) New Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | 689,688 | 443,170
Number of outstanding units granted (in units) | 199,430 | 258,970
Number of outstanding units performance factor impact on redemption (in units) | (14,796) | 0
Number of outstanding units granted in lieu of dividends (in units) | 11,764 | 5,545
Number of outstanding units redeemed (in units) | (119,714) | 0
Number of outstanding units cancelled (in units) | (21,485) | (17,997)
Number of outstanding units, end of period (in units) | 744,887 | 689,688

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + Details
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