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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of operating segments [line items]    
External revenue $ 3,371.3 $ 2,981.9
Non-current assets other than financial instruments and deferred tax assets 7,166.3 5,084.2
Canada    
Disclosure of operating segments [line items]    
External revenue 366.8 455.9
Non-current assets other than financial instruments and deferred tax assets 1,570.8 1,459.1
United States    
Disclosure of operating segments [line items]    
External revenue 1,682.5 1,324.2
Non-current assets other than financial instruments and deferred tax assets 3,554.2 1,571.1
United Kingdom    
Disclosure of operating segments [line items]    
External revenue 208.5 137.7
Non-current assets other than financial instruments and deferred tax assets 370.4 358.8
Rest of Americas    
Disclosure of operating segments [line items]    
External revenue 78.4 55.0
Non-current assets other than financial instruments and deferred tax assets 177.0 205.6
Europe    
Disclosure of operating segments [line items]    
External revenue 473.4 553.2
Non-current assets other than financial instruments and deferred tax assets 916.3 906.2
Asia    
Disclosure of operating segments [line items]    
External revenue 472.2 381.4
Non-current assets other than financial instruments and deferred tax assets 498.1 501.6
Oceania and Africa    
Disclosure of operating segments [line items]    
External revenue 89.5 74.5
Non-current assets other than financial instruments and deferred tax assets $ 79.5 $ 81.8