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CONTINGENCIES AND COMMITMENTS (Details) - CAD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Disclosure of finance lease and operating lease by lessee [line items]    
Contractual capital commitments $ 239.8 $ 291.7
No later than 1 year    
Disclosure of finance lease and operating lease by lessee [line items]    
Contractual capital commitments 204.7 240.2
Later than 1 year and no later than 5 years    
Disclosure of finance lease and operating lease by lessee [line items]    
Contractual capital commitments $ 35.1 $ 51.5