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STOCK-BASED COMPENSATION - Stock Options Activity (Details) | 12 Months Ended
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Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Share-based Payment Arrangements [Abstract] |  |
Number of options, beginning of year (in shares) | shares | 3,154,795 | 2,719,612
Number of options, Granted (in shares) | shares | 1,598,590 | 1,179,160
Number of options, Exercised (in shares) | shares | (17,230) | (743,977)
Number of options, Forfeited (in shares) | shares | (9,521) | 0
Number of options, end of year (in shares) | shares | 4,726,634 | 3,154,795
Number of options, Exercisable, end of year (in shares) | shares | 1,470,383 | 993,645
Weighted average exercise price, beginning of year (in dollars per share) | $ / shares | $ 61.82 | $ 53.22
Weighted average exercise price, Granted (in dollars per share) | $ / shares | 62.56 | 72.03
Weighted average exercise price, Exercised (in dollars per share) | $ / shares | 54.80 | 46.56
Weighted average exercise price, Forfeited (in dollars per share) | $ / shares | 58.45 | 0
Weighted average exercise price, end of year (in dollars per share) | $ / shares | 62.10 | 61.82
Weighted average exercise price, Exercisable, end of year (in dollars per share) | $ / shares | $ 56.75 | $ 52.38

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- Definition The number of share options outstanding 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 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_d&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of share options exercisable 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 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of share options forfeited 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 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2020-01-01 + Details
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