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DISCONTINUED OPERATIONS - Gain on Disposal (Details) - CAD ($)
$ in Millions
 12 Months Ended
Feb. 16, 2024
Mar. 31, 2025
Mar. 31, 2024
Disclosure of analysis of single amount of discontinued operations [line items]      
Consideration received in cash $ 275.3 $ 0.0 $ 275.3
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 from OCI   (10.1) (1.6)
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)
After-tax gain on disposal of discontinued operations   0.0 16.5
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 from OCI (2.5) $ 0.0 $ (2.5)
After-tax gain on disposal of discontinued operations $ 16.5