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STOCK-BASED COMPENSATION - Stock Options (Details) CAD / shares in Units, $ / shares in Units, shares in Millions | Dec. 31, 2017 CAD shares year CAD / shares | Dec. 31, 2017 USD ($) shares year $ / shares | Dec. 31, 2016 CAD shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 CAD shares | Dec. 31, 2015 USD ($) shares
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Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |
Closing market share price (in dollars per share) | (per share) | CAD 18.18 | $ 14.47 |  |  |  |
Canada |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |
Stock options outstanding (shares) | shares | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3
Stock options outstanding, average price (in dollars per share) | CAD | CAD 13 |  | CAD 13 |  | CAD 13 |
Stock options outstanding, average life | year | 3.9 | 3.9 |  |  |  |
Stock options outstanding, intrinsic value | CAD | CAD 2,000,000 |  |  |  |  |
Stock options exercisable (in shares) | shares | 0.2 | 0.2 |  |  |  |
Stock options exercisable, average price (in dollars per option) | CAD | CAD 14 |  |  |  |  |
Stock options exercisable, intrinsic value | CAD | CAD 1,000,000 |  |  |  |  |
United States |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |
Stock options outstanding (shares) | shares | 0.7 | 0.7 | 1.8 | 1.8 | 2.6 | 2.6
Stock options outstanding, average price (in dollars per share) | $ |  | $ 40 |  | $ 42 |  | $ 42
Stock options outstanding, average life | year | 1.5 | 1.5 |  |  |  |
Stock options outstanding, intrinsic value | $ |  | $ 0 |  |  |  |
Stock options exercisable (in shares) | shares | 0.7 | 0.7 |  |  |  |
Stock options exercisable, average price (in dollars per option) | $ |  | $ 40 |  |  |  |
Stock options exercisable, intrinsic value | $ |  | $ 0 |  |  |  |
$9 - $17 | Minimum |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |
Exercise price of outstanding options (in dollars per share) | CAD | CAD 9 |  |  |  |  |
$9 - $17 | Maximum |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |
Exercise price of outstanding options (in dollars per share) | CAD | CAD 17 |  |  |  |  |
$9 - $17 | Canada |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |
Stock options outstanding (shares) | shares | 0.2 | 0.2 |  |  |  |
Stock options outstanding, average price (in dollars per share) | CAD | CAD 10 |  |  |  |  |
Stock options outstanding, average life | year | 4.6 | 4.6 |  |  |  |
Stock options outstanding, intrinsic value | CAD | CAD 2,000,000 |  |  |  |  |
Stock options exercisable (in shares) | shares | 0.1 | 0.1 |  |  |  |
Stock options exercisable, average price (in dollars per option) | CAD | CAD 10 |  |  |  |  |
Stock options exercisable, intrinsic value | CAD | 1,000,000 |  |  |  |  |
$18 - $21 | Minimum |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |
Exercise price of outstanding options (in dollars per share) | CAD | 18 |  |  |  |  |
$18 - $21 | Maximum |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |
Exercise price of outstanding options (in dollars per share) | CAD | CAD 21 |  |  |  |  |
$18 - $21 | Canada |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |
Stock options outstanding (shares) | shares | 0.1 | 0.1 |  |  |  |
Stock options outstanding, average price (in dollars per share) | CAD | CAD 18 |  |  |  |  |
Stock options outstanding, average life | year | 2.6 | 2.6 |  |  |  |
Stock options outstanding, intrinsic value | CAD | CAD 0 |  |  |  |  |
Stock options exercisable (in shares) | shares | 0.1 | 0.1 |  |  |  |
Stock options exercisable, average price (in dollars per option) | CAD | CAD 18 |  |  |  |  |
Stock options exercisable, intrinsic value | CAD | CAD 0 |  |  |  |  |
$32 - $41 | Minimum |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |
Exercise price of outstanding options (in dollars per share) | $ |  | $ 32 |  |  |  |
$32 - $41 | Maximum |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |
Exercise price of outstanding options (in dollars per share) | $ |  | $ 41 |  |  |  |
$32 - $41 | United States |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |
Stock options outstanding (shares) | shares | 0.4 | 0.4 |  |  |  |
Stock options outstanding, average price (in dollars per share) | $ |  | $ 32 |  |  |  |
Stock options outstanding, average life | year | 2.0 | 2.0 |  |  |  |
Stock options outstanding, intrinsic value | $ |  | $ 0 |  |  |  |
Stock options exercisable (in shares) | shares | 0.4 | 0.4 |  |  |  |
Stock options exercisable, average price (in dollars per option) | $ |  | $ 33 |  |  |  |
Stock options exercisable, intrinsic value | $ |  | 0 |  |  |  |
$42 - $55 | Minimum |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |
Exercise price of outstanding options (in dollars per share) | $ |  | 42 |  |  |  |
$42 - $55 | Maximum |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |
Exercise price of outstanding options (in dollars per share) | $ |  | $ 55 |  |  |  |
$42 - $55 | United States |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |
Stock options outstanding (shares) | shares | 0.3 | 0.3 |  |  |  |
Stock options outstanding, average price (in dollars per share) | $ |  | $ 49 |  |  |  |
Stock options outstanding, average life | year | 1.0 | 1.0 |  |  |  |
Stock options outstanding, intrinsic value | $ |  | $ 0 |  |  |  |
Stock options exercisable (in shares) | shares | 0.3 | 0.3 |  |  |  |
Stock options exercisable, average price (in dollars per option) | $ |  | $ 49 |  |  |  |
Stock options exercisable, intrinsic value | $ |  | $ 0 |  |  |  |

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