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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of operating segments [line items]    
External revenue $ 4,707.9 $ 4,282.8
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 8,658.5 7,340.0
Canada    
Disclosure of operating segments [line items]    
External revenue 474.2 460.7
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 1,541.7 1,527.7
United States    
Disclosure of operating segments [line items]    
External revenue 2,241.8 2,076.3
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 4,534.7 3,623.5
United Kingdom    
Disclosure of operating segments [line items]    
External revenue 281.6 271.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 399.0 360.5
Rest of Americas    
Disclosure of operating segments [line items]    
External revenue 133.0 98.8
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 221.8 201.9
Europe    
Disclosure of operating segments [line items]    
External revenue 663.6 645.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 1,162.3 985.5
Asia    
Disclosure of operating segments [line items]    
External revenue 759.9 566.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 610.8 532.0
Oceania and Africa    
Disclosure of operating segments [line items]    
External revenue 153.8 164.7
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets $ 188.2 $ 108.9