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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2018 | 725 |  |  | $11.6 |  | 4,537 |  |  | $37.7 |
Settled for cash | (143 | ) | (1.9 | ) | (3,089 | ) | (34.6 | )
Forfeited | — |  | — |  | (731 | ) | (7.9 | )
Granted | 182 |  | 2.3 |  | 2,974 |  | 35.3 |
Credits for dividends | — |  | — |  | 60 |  | 0.8 |
Change in value | — |  | (0.8 | ) | — |  | 4.7 |
At December 31, 2018 | 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 |  |  | $41.5 |
Employee stock option activity |
| 2019 | 2018
| Shares |  | Average Price |  | Shares |  | Average Price |
C$ options |  |  |  |
At January 1 | 0.3 |  |  | $13 |  | 0.3 |  |  | $13 |
Exercised | (0.1 | ) | 16 |  | — |  | 10 |
At December 31 | 0.2 |  |  | $10 |  | 0.3 |  |  | $13 |
US$ options |  |  |  |
At January 1 | 0.5 |  |  | $37 |  | 0.7 |  |  | $40 |
Forfeited | — |  | — |  | (0.1 | ) | 34 |
Cancelled/expired | (0.4 | ) | 39 |  | (0.1 | ) | 49 |
At December 31 | 0.1 |  |  | $32 |  | 0.5 |  |  | $37 |
Stock options outstanding |
| Outstanding | Exercisable
Range of exercise prices | Shares |  | Average price |  | Average life (years) |  | Intrinsic value 1 ($ millions) |  | Shares |  | Average price |  | Intrinsic value 1 ($ millions) |
C$ options |  |  |  |  |  |  |
$9 - $17 | 0.2 |  |  | $10 |  | 2.6 |  |  | $2 |  | 0.2 |  |  | $10 |  |  | $2 |
US$ options |  |  |  |  |  |  |
$32 - $41 | 0.1 |  |  | $32 |  | 0.1 |  |  | $— |  | 0.1 |  |  | $32 |  |  | $— |
1 Based on the closing market share price on December 31, 2019 of C$24.12 and US$18.59.
Stock options outstanding and exercisable |
| Outstanding | Exercisable
Range of exercise prices | Shares |  | Average price |  | Average life (years) |  | Intrinsic value 1 ($ millions) |  | Shares |  | Average price |  | Intrinsic value 1 ($ millions) |
C$ options |  |  |  |  |  |  |
$9 - $17 | 0.2 |  |  | $10 |  | 2.6 |  |  | $2 |  | 0.2 |  |  | $10 |  |  | $2 |
US$ options |  |  |  |  |  |  |
$32 - $41 | 0.1 |  |  | $32 |  | 0.1 |  |  | $— |  | 0.1 |  |  | $32 |  |  | $— |
1 Based on the closing market share price on December 31, 2019 of C$24.12 and US$18.59.

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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 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 45 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard -URIDate 2018-03-16 + Details
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