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STOCK-BASED COMPENSATION - Restricted and Deferred Share Unit Activity (Details) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, beginning of year (in shares) | 2,573,894 | 2,472,774
Granted and reinvested dividends (in shares) | 1,341,801 | 1,026,067
Exercised (in shares) | (1,041,890) | (803,266)
Forfeited (in shares) | (182,517) | (121,681)
Outstanding, end of year (in shares) | 2,691,288 | 2,573,894
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, beginning of year (in shares) | 1,619,941 | 1,741,884
Granted and reinvested dividends (in shares) | 78,939 | 80,252
Exercised (in shares) | (277,439) | (192,718)
Forfeited (in shares) | (99) | (9,477)
Outstanding, end of year (in shares) | 1,421,342 | 1,619,941

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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) outstanding 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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