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LEASES - Schedule of Undiscounted Lease Payments to be Received Under Operating Leases (Details) - CAD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments receivable $ 221.1 $ 186.5
Less than 1 year    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments receivable 38.3 36.2
Between 1 and 2 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments receivable 35.6 30.6
Between 2 and 3 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments receivable 30.4 29.7
Between 3 and 4 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments receivable 25.8 25.8
Between 4 and 5 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments receivable 25.3 21.4
More than 5 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments receivable $ 65.7 $ 42.8