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Share-based compensation - Changes in other equity instruments (Details) - shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | 155,761 | 133,418
Number of outstanding units granted (in units) | 18,417 | 19,909
Number of outstanding units performance factor impact on redemption (in units) | 0 | 0
Number of outstanding units granted in lieu of dividends (in units) | 2,484 | 2,434
Number of outstanding units redeemed (in units) | (18,962) | 0
Number of outstanding units cancelled (in units) | 0 | 0
Number of outstanding units, end of period (in units) | 157,700 | 155,761
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | 340,929 | 332,385
Number of outstanding units granted (in units) | 104,980 | 104,810
Number of outstanding units performance factor impact on redemption (in units) | 0 | 0
Number of outstanding units granted in lieu of dividends (in units) | 5,267 | 5,561
Number of outstanding units redeemed (in units) | (131,398) | (82,039)
Number of outstanding units cancelled (in units) | (8,924) | (19,788)
Number of outstanding units, end of period (in units) | 310,854 | 340,929
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) | 744,887 | 689,688
Number of outstanding units granted (in units) | 179,340 | 199,430
Number of outstanding units performance factor impact on redemption (in units) | 143,065 | (14,796)
Number of outstanding units granted in lieu of dividends (in units) | 10,411 | 11,764
Number of outstanding units redeemed (in units) | (435,035) | (119,714)
Number of outstanding units cancelled (in units) | (11,546) | (21,485)
Number of outstanding units, end of period (in units) | 631,122 | 744,887

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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/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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