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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - CAD ($)
$ in Millions
Mar. 31, 2021
Mar. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]    
Accounts payable trade $ 461.9 $ 539.7
Accrued liabilities 452.1 370.9
Deferred revenue 9.7 15.2
Amount due to related parties (Note 35) 5.8 5.7
Current portion of royalty obligations 16.1 2.9
Accounts payable and accrued liabilities $ 945.6 $ 934.4