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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Payment Arrangements [Abstract] |
Other equity instruments activity | DSU and RSU Activity
| DSUs | Fair value | RSUs | Fair value
At January 1, 2016 | 465 |  |  | $3.5 |  | 6,627 |  |  | $24.6 |
Settled for cash | (26 | ) | (0.4 | ) | (1,102 | ) | (22.7 | )
Forfeited | — |  | — |  | (2,952 | ) | (46.3 | )
Granted | 134 |  | 2.2 |  | 3,836 |  | 55.0 |
Credits for dividends | — |  | — |  | 43 |  | 0.7 |
Change in value | — |  | 3.8 |  | — |  | 47.3 |
At December 31, 2016 | 573 |  |  | $9.2 |  | 6,452 |  |  | $58.6 |
Settled for cash | — |  | — |  | (3,610 | ) | (62.5 | )
Forfeited | — |  | — |  | (121 | ) | (2.3 | )
Granted | 152 |  | 2.5 |  | 1,760 |  | 32.7 |
Credits for dividends | — |  | — |  | 56 |  | 0.9 |
Change in value | — |  | (0.1 | ) | — |  | 10.3 |
At December 31, 2017 | 725 |  |  | $11.6 |  | 4,537 |  |  | $37.7 |
Employee stock option activity |
| 2017 | 2016
| Shares |  | Average Price |  | Shares |  | Average Price |
C$ options |  |  |  |
At January 1 | 0.3 |  |  | $13 |  | 0.3 |  |  | $13 |
Granted | — |  | — |  | — |  | — |
Cancelled/expired | — |  | — |  | — |  | — |
At December 31 | 0.3 |  |  | $13 |  | 0.3 |  |  | $13 |
US$ options |  |  |  |
At January 1 | 1.8 |  |  | $42 |  | 2.6 |  |  | $42 |
Forfeited | (0.7 | ) | 40 |  | (0.4 | ) | 45 |
Cancelled/expired | (0.4 | ) | 45 |  | (0.4 | ) | 39 |
At December 31 | 0.7 |  |  | $40 |  | 1.8 |  |  | $42 |
Stock options outstanding |
| Outstanding | Exercisable
Range of exercise prices | Shares |  | Average price |  | Average life (years) |  | Intrinsic value 1 ($ millions) |  | Shares |  | Average price |  | Intrinsic value 1 ($ millions) |
C$ options |  |  |  |  |  |  |
$ 9 - $ 17 | 0.2 |  |  | $10 |  | 4.6 |  |  | $2 |  | 0.1 |  |  | $10 |  |  | $1 |
$ 18 - $ 21 | 0.1 |  | 18 |  | 2.6 |  | — |  | 0.1 |  | 18 |  | — |
| 0.3 |  |  | $13 |  | 3.9 |  |  | $2 |  | 0.2 |  |  | $14 |  |  | $1 |
US$ options |  |  |  |  |  |  |
$ 32 - $ 41 | 0.4 |  |  | $32 |  | 2.0 |  |  | $— |  | 0.4 |  |  | $33 |  |  | $— |
$ 42 - $ 55 | 0.3 |  | 49 |  | 1.0 |  | — |  | 0.3 |  | 49 |  | — |
| 0.7 |  |  | $40 |  | 1.5 |  |  | $— |  | 0.7 |  |  | $40 |  |  | $— |
1 Based on the closing market share price on December 31, 2017 of C $18.18 and US $14.47.
Stock options outstanding and exercisable |
| Outstanding | Exercisable
Range of exercise prices | Shares |  | Average price |  | Average life (years) |  | Intrinsic value 1 ($ millions) |  | Shares |  | Average price |  | Intrinsic value 1 ($ millions) |
C$ options |  |  |  |  |  |  |
$ 9 - $ 17 | 0.2 |  |  | $10 |  | 4.6 |  |  | $2 |  | 0.1 |  |  | $10 |  |  | $1 |
$ 18 - $ 21 | 0.1 |  | 18 |  | 2.6 |  | — |  | 0.1 |  | 18 |  | — |
| 0.3 |  |  | $13 |  | 3.9 |  |  | $2 |  | 0.2 |  |  | $14 |  |  | $1 |
US$ options |  |  |  |  |  |  |
$ 32 - $ 41 | 0.4 |  |  | $32 |  | 2.0 |  |  | $— |  | 0.4 |  |  | $33 |  |  | $— |
$ 42 - $ 55 | 0.3 |  | 49 |  | 1.0 |  | — |  | 0.3 |  | 49 |  | — |
| 0.7 |  |  | $40 |  | 1.5 |  |  | $— |  | 0.7 |  |  | $40 |  |  | $— |
1 Based on the closing market share price on December 31, 2017 of C $18.18 and US $14.47.

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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 2017-01-01 -Paragraph 45 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard -URIDate 2017-03-09 + Details
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