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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure of operating segments [line items]    
Revenue $ 2,981.9 $ 3,623.2
Non-current assets other than financial instruments and deferred tax assets 5,084.2 5,371.7
Canada    
Disclosure of operating segments [line items]    
Revenue 455.9 323.2
Non-current assets other than financial instruments and deferred tax assets 1,459.1 1,449.4
United States    
Disclosure of operating segments [line items]    
Revenue 1,324.2 1,541.8
Non-current assets other than financial instruments and deferred tax assets 1,571.1 1,845.5
United Kingdom    
Disclosure of operating segments [line items]    
Revenue 137.7 208.8
Non-current assets other than financial instruments and deferred tax assets 358.8 403.4
Rest of Americas    
Disclosure of operating segments [line items]    
Revenue 55.0 127.7
Non-current assets other than financial instruments and deferred tax assets 205.6 250.4
Europe    
Disclosure of operating segments [line items]    
Revenue 553.2 631.7
Non-current assets other than financial instruments and deferred tax assets 906.2 801.0
Asia    
Disclosure of operating segments [line items]    
Revenue 381.4 707.1
Non-current assets other than financial instruments and deferred tax assets 501.6 586.9
Oceania and Africa    
Disclosure of operating segments [line items]    
Revenue 74.5 82.9
Non-current assets other than financial instruments and deferred tax assets $ 81.8 $ 35.1