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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of operating segments [line items]    
External revenue $ 4,282.8 $ 4,010.6
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 7,340.0 7,870.4
Canada    
Disclosure of operating segments [line items]    
External revenue 460.7 361.2
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 1,527.7 1,641.2
United States    
Disclosure of operating segments [line items]    
External revenue 2,076.3 2,059.5
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 3,623.5 4,049.8
United Kingdom    
Disclosure of operating segments [line items]    
External revenue 271.1 251.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 360.5 383.9
Rest of Americas    
Disclosure of operating segments [line items]    
External revenue 98.8 86.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 201.9 180.8
Europe    
Disclosure of operating segments [line items]    
External revenue 645.1 559.7
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 985.5 982.4
Asia    
Disclosure of operating segments [line items]    
External revenue 566.1 603.7
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets 532.0 519.8
Oceania and Africa    
Disclosure of operating segments [line items]    
External revenue 164.7 89.3
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets $ 108.9 $ 112.5