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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangements [Abstract] |
Other equity instruments activity | DSU and RSU Activity (Number of Units in Thousands)
| DSUs | Fair value | RSUs | Fair value
At January 1, 2019 | 764 |  | $11.2 |  | 3,751 |  | $36.0 |
Settled for cash | (404) |  | (6.5) |  | (2,131) |  | (30.7) |
Forfeited | — |  | — |  | (1,157) |  | (15.8) |
Granted | 116 |  | 1.9 |  | 2,600 |  | 35.3 |
Credits for dividends | — |  | — |  | 47 |  | 0.8 |
Change in value | — |  | 2.2 |  | — |  | 15.9 |
At December 31, 2019 | 476 |  | $8.8 |  | 3,110 |  | $41.5 |
Settled for cash | — |  | — |  | (2,136) |  | (47.3) |
Forfeited | — |  | — |  | (313) |  | (5.7) |
Granted | 85 |  | 2.0 |  | 1,923 |  | 35.2 |
Credits for dividends | — |  | — |  | 39 |  | 0.9 |
Change in value | — |  | 2.0 |  | — |  | 14.0 |
At December 31, 2020 | 561 |  | $12.8 |  | 2,623 |  | $38.6 |
Employee stock option activity |
| 2020 | 2019
| Shares | Average Price | Shares | Average Price
C$ options |  |  |  |
At January 1 | 0.2 |  | $10 |  | 0.3 |  | $13 |
Exercised | (0.1) |  | 10 |  | (0.1) |  | 16 |
At December 31 | 0.1 |  | $10 |  | 0.2 |  | $10 |
US$ options |  |  |  |
At January 1 | 0.1 |  | $32 |  | 0.5 |  | $37 |
Cancelled/expired | (0.1) |  | 32 |  | (0.4) |  | 39 |
At December 31 | — |  | $— |  | 0.1 |  | $32 |
Stock options outstanding and exercisable |
| Outstanding | Exercisable
Range of exercise prices | Shares | Average price | Average life (years) | Intrinsic value 1 ($ millions) | Shares | Average price | Intrinsic value 1 ($ millions)
C$ options |  |  |  |  |  |  |
$9 - $17 | 0.1 |  | $10 |  | 1.6 | $1 |  | 0.1 |  | $10 |  | $1 |
1 Based on the closing market share price on December 31, 2020 of C$29.00.

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- Definition Share-based Payment Arrangements [Abstract] + References No definition available. + Details
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- Definition The disclosure of the number and weighted average exercise prices of other equity instruments (ie other than share options). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The disclosure of the number and weighted average exercise prices of share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The disclosure of the number and weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard -URIDate 2019-03-27 + Details
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