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Share-based compensation - Changes in other equity instruments (Details) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | 122,947 | 89,766
Number of outstanding units granted (in units) | 23,384 | 29,393
Number of outstanding units performance factor impact on redemption (in units) | 0 | 0
Number of outstanding units granted in lieu of dividends (in units) | 1,074 | 3,788
Number of outstanding units redeemed (in units) | (13,987) | 0
Number of outstanding units cancelled (in units) | 0 | 0
Number of outstanding units, end of period (in units) | 133,418 | 122,947
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in units) | 228,872 | 83,168
Number of outstanding units granted (in units) | 132,360 | 154,460
Number of outstanding units performance factor impact on redemption (in units) | 0 | 0
Number of outstanding units granted in lieu of dividends (in units) | 2,729 | 7,326
Number of outstanding units redeemed (in units) | (6,103) | (7,713)
Number of outstanding units cancelled (in units) | (25,473) | (8,369)
Number of outstanding units, end of period (in units) | 332,385 | 228,872
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) | 146,801 | 303,445
Number of outstanding units granted (in units) | 0 | 0
Number of outstanding units performance factor impact on redemption (in units) | (110,354) | (117,674)
Number of outstanding units granted in lieu of dividends (in units) | 0 | 4,529
Number of outstanding units redeemed (in units) | (36,447) | (39,612)
Number of outstanding units cancelled (in units) | 0 | (3,887)
Number of outstanding units, end of period (in units) | 0 | 146,801
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) | 443,170 | 138,038
Number of outstanding units granted (in units) | 258,970 | 301,090
Number of outstanding units performance factor impact on redemption (in units) | 0 | 0
Number of outstanding units granted in lieu of dividends (in units) | 5,545 | 13,597
Number of outstanding units redeemed (in units) | 0 | (1,842)
Number of outstanding units cancelled (in units) | (17,997) | (7,713)
Number of outstanding units, end of period (in units) | 689,688 | 443,170

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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 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
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