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STOCK-BASED COMPENSATION - Employee Stock Options (Details) shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 shares CAD ($) | Dec. 31, 2020 shares USD ($) CAD ($) | Dec. 31, 2019 shares CAD ($) | Dec. 31, 2019 shares CAD ($) USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($)
Canada |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of options at January 1 (shares) | 0.2 | 0.2 | 0.3 | 0.3 |  |  |  |
Number of share options exercised in share-based payment arrangement | (0.1) | (0.1) | (0.1) | (0.1) |  |  |  |
Number of options at December 31 (shares) | 0.1 | 0.1 | 0.2 | 0.2 |  |  |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ | $ 10 | $ 10 | $ 10 | $ 10 |  |  | $ 13 |
Weighted average exercise price of share options exercised in share-based payment arrangement | $ | $ 10 |  | $ 16 |  |  |  |  |
United States |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |
Number of options at January 1 (shares) | 0.1 | 0.1 | 0.5 | 0.5 |  |  |  |
Number of options cancelled/expired (shares) | (0.1) | (0.1) | (0.4) | (0.4) |  |  |  |
Number of options at December 31 (shares) | 0.0 | 0.0 | 0.1 | 0.1 |  |  |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ |  |  |  |  | $ 0 | $ 32 |  | $ 37
Weighted average exercise price of share options expired in share-based payment arrangement | $ |  | $ 32 |  | $ 39 |  |  |  |

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