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SHARE-BASED COMPENSATION - Restricted Stock and Performance Share Units Fair Value Inputs (Details)
12 Months Ended
Dec. 31, 2021
CAD ($)
year
Dec. 31, 2020
CAD ($)
year
Restricted Share Units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected life of units issued (years) | year 1.9 2.4
Grant-date fair value (CAD per share)1 | $ $ 4.12 $ 3.32
Performance Share Units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected life of units issued (years) | year 0.5 0.7
Grant-date fair value (CAD per share)1 | $ $ 4.39 $ 3.23