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EQUITY - Changes in Number of DSUs and RSUS (Details) - Cash-Settled Share-Based Payment Arrangement $ / shares in Units, shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 CAD ($) shares $ / shares | Dec. 31, 2020 CAD ($) shares $ / shares | Dec. 31, 2019 shares $ / shares
Deferred Stock Unit |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 18,286 | 18,721 | 21,204
Granted and reinvested (in shares) | 1,929 | 623 |
Number Of Share Options Exercised And Cancelled In Share-Based Payment Arrangement | (2,364) | (3,106) |
Restricted Stock |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 13,679 | 13,679 | 15,810
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ / shares | $ 6.10 | $ 6.10 | $ 6.14
Granted and reinvested (in shares) | 0 | 0 |
Weighted Average Exercise Price Of Share Options Granted And Reinvested (in dollars per share) | $ | $ 0 | $ 0 |
Number Of Share Options Exercised And Cancelled In Share-Based Payment Arrangement | 0 | (2,131) |
Weighted Average Exercise Price Of Share Options Exercised And Cancelled (in dollars per share) | $ | $ 0 | $ 6.35 |
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise | $ / shares |  | $ 6.10 |

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