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STOCK-BASED COMPENSATION - Stock Options (Details) shares in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) shares $ / shares | Dec. 31, 2019 shares CAD ($) | Dec. 31, 2018 shares CAD ($)
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Closing market share price (in dollars per share) | $ / shares | $ 29.00 |  |
Canada |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Stock options outstanding (shares) | shares | 0.1 | 0.2 | 0.3
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ 10 | $ 10 | $ 13
$9 - $17 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 9 |  |
$9 - $17 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 17 |  |
$9 - $17 | Canada |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Stock options outstanding (shares) | shares | 0.1 |  |
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ 10 |  |
Weighted average remaining contractual life of outstanding share options | 1 year 7 months 6 days |  |
Stock options outstanding, intrinsic value | $ 1,000,000 |  |
Stock options exercisable (in shares) | shares | 0.1 |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ 10 |  |
Stock options exercisable, intrinsic value | $ 1,000,000 |  |

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