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SHARE-BASED COMPENSATION - Stock Options Fair Value Inputs (Details)
$ / shares in Units, shares in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
shares
year
$ / shares
Dec. 31, 2022
CAD ($)
year
shares
$ / shares
Granted during the year (in shares) | shares 1.0 0.8
Options    
Weighted average risk-free interest rate 3.50% 1.80%
Weighted average expected volatility 57.70% 53.20%
Weighted average dividend yield 0.00% 0.00%
Weighted average expected life of options issued (years) | year 5.0 5.0
Weighted average grant-date fair value (CAD per share) | $ $ 1.88 $ 1.89
Weighted average share price at grant date (CAD per share) | $ / shares $ 3.63 $ 4.03
Weighted average exercise price (CAD per share) | $ / shares $ 3.70 $ 4.02
Deferred share units    
Granted during the year (in shares) | shares 0.5 0.3
Weighted average grant-date fair value (CAD per share) | $ $ 3.55 $ 3.57