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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of operating segments [line items]    
Revenue $ 3,623.2 [1] $ 3,304.1
Non-current assets other than financial instruments and deferred tax assets 5,371.7 4,791.5
Canada    
Disclosure of operating segments [line items]    
Revenue 323.2 253.3
Non-current assets other than financial instruments and deferred tax assets 1,449.4 1,395.2
United States    
Disclosure of operating segments [line items]    
Revenue 1,541.8 1,285.0
Non-current assets other than financial instruments and deferred tax assets 1,845.5 1,580.7
United Kingdom    
Disclosure of operating segments [line items]    
Revenue 208.8 210.4
Non-current assets other than financial instruments and deferred tax assets 403.4 285.2
Rest of Americas    
Disclosure of operating segments [line items]    
Revenue 127.7 76.2
Non-current assets other than financial instruments and deferred tax assets 250.4 269.2
Europe    
Disclosure of operating segments [line items]    
Revenue 631.7 682.6
Non-current assets other than financial instruments and deferred tax assets 801.0 692.6
Asia    
Disclosure of operating segments [line items]    
Revenue 707.1 699.7
Non-current assets other than financial instruments and deferred tax assets 586.9 533.2
Africa and Oceania    
Disclosure of operating segments [line items]    
Revenue 82.9 96.9
Non-current assets other than financial instruments and deferred tax assets $ 35.1 $ 35.4
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.