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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - CAD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]        
Accounts payable trade $ 458.9 $ 306.0    
Accrued liabilities 400.2 343.7    
Amount due to related parties 2.2 7.3    
Current portion of royalty obligations 10.9 9.9    
Accounts payable and accrued liabilities $ 872.2 $ 666.9 $ 686.1 $ 686.1