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Share-based payments - Outstanding RSUs/PSUs Activity (Details) - RSUs/PSUs | 12 Months Ended
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Dec. 31, 2020 CAD ($) shares | Dec. 31, 2019 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance, outstanding (in shares) | 2,915,118 | 2,812,697
Granted (in shares) | 866,127 | 975,348
Dividends credited (in shares) | 165,435 | 149,648
Settled (in shares) | (935,117) | (932,133)
Forfeited (in shares) | (38,170) | (90,442)
Ending balance, outstanding (in shares) | 2,973,393 | 2,915,118
Vested (in shares) | 1,065,454 | 904,266
Weighted average fair value at measurement date, other equity instruments granted | $ | $ 63 | $ 58

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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 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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