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DISCONTINUED OPERATIONS - Gain on Disposal (Details) - CAD ($)
$ in Millions
 12 Months Ended
Feb. 16, 2024
Mar. 31, 2024
Mar. 31, 2023
Disclosure of analysis of single amount of discontinued operations [line items]      
Proceeds from disposal of discontinued operations $ 275.3 $ 275.3 $ 0.0
Short-term holdback receivable 8.0    
Long-term non-contingent receivable 10.1    
Impairment of non-financial assets of the disposal group excluded from the sale 7.8    
Reclassification to income of gains on foreign currency exchange differences   (1.6) (6.4)
Transaction fees and other costs 12.2    
Gain on disposal of discontinued operations before income taxes 6.3    
Income tax recovery (10.2) (18.7) (1.6)
After-tax gain on disposal of discontinued operations   16.5 0.0
Discontinued operations      
Disclosure of analysis of single amount of discontinued operations [line items]      
Total consideration (293.4)    
Net assets disposed 269.6    
Reclassification to income of gains on foreign currency exchange differences (2.5) $ (2.5) $ 0.0
After-tax gain on disposal of discontinued operations $ 16.5