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OTHER (GAINS) AND LOSSES (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
Net gain on foreign currency exchange differences   (2.4) (12.6)
Remeasurement of royalty obligations   (6.1) (7.4)
Remeasurement of contingent consideration arising on business combinations   0.0 2.6
Settlement gain on annuity purchase transaction (Note $20)   (5.2) 0.0
Other   5.9 (5.0)
Other (gains) and losses   $ 27.9 $ (22.4)