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RELATED PARTY TRANSACTIONS - Outstanding Balances (Details) - CAD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Disclosure of transactions between related parties [line items]    
Accounts receivable $ 45.8 $ 30.9
Accounts payable and accrued liabilities 5.7 2.2
Joint ventures    
Disclosure of transactions between related parties [line items]    
Accounts receivable 51.2 33.9
Contract assets 38.5 13.4
Other non-current assets 25.6 18.7
Accounts payable and accrued liabilities 5.7 2.2
Contract liabilities 28.8 30.7
Other non-current liabilities $ 1.7 $ 1.6