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OTHER (GAINS) AND LOSSES - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Mar. 31, 2023
Analysis of income and expense [abstract]      
Impairment of technology and other non-financial assets (Note 5) $ 35.7 $ 35.7 $ 0.0
Impairment of intangible assets 31.4    
Impairment of property, plant and equipment $ 4.3