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OTHER (GAINS) AND LOSSES (Tables)
 12 Months Ended
Mar. 31, 2025
Analysis of income and expense [abstract]  
Schedule of other gains and losses
20252024
Impairment of technology and other non-financial assets $— $35.7 
Net gain on foreign currency exchange differences(1.4)(2.4)
Remeasurement of royalty obligations(2.9)(6.1)
Settlement gain on annuity purchase transaction (Note 22)
— (5.2)
Gain on disposal of property, plant and equipment(6.4)— 
Other(2.6)5.9 
Other (gains) and losses$(13.3)$27.9