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RELATED PARTY TRANSACTIONS - Outstanding Balances (Details) - CAD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Disclosure of transactions between related parties [line items]    
Accounts receivable $ 33.9 $ 38.0
Accounts payable and accrued liabilities 2.2 7.3
Joint ventures    
Disclosure of transactions between related parties [line items]    
Accounts receivable 33.9 38.0
Contract assets 13.4 15.9
Other assets 18.7 25.3
Accounts payable and accrued liabilities 2.2 7.3
Contract liabilities 30.7 6.4
Other long-term liabilities $ 1.6 $ 0.0