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STOCK-BASED COMPENSATION - Restricted and Deferred Share Unit Activity (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, beginning of year (in shares) | 2,472,774 | 2,218,925
Granted and reinvested dividends (in shares) | 1,026,067 | 1,013,900
Exercised (in shares) | (803,266) | (582,314)
Forfeited (in shares) | (121,681) | (177,737)
Outstanding, end of year (in shares) | 2,573,894 | 2,472,774
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, beginning of year (in shares) | 1,741,884 | 2,004,440
Granted and reinvested dividends (in shares) | 80,252 | 110,003
Exercised (in shares) | (192,718) | (348,285)
Forfeited (in shares) | (9,477) | (24,274)
Outstanding, end of year (in shares) | 1,619,941 | 1,741,884

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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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