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OTHER (GAINS) AND LOSSES (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Analysis of income and expense [abstract]      
Impairment of technology and other non-financial assets $ 35.7 $ 0.0 $ 35.7
Net gain on foreign currency exchange differences   (1.4) (2.4)
Remeasurement of royalty obligations   (2.9) (6.1)
Settlement gain on annuity purchase transaction (Note $22)   0.0 (5.2)
Gain on disposal of property, plant and equipment   (6.4) 0.0
Other   (2.6) 5.9
Other (gains) and losses   $ (13.3) $ 27.9