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RELATED PARTY TRANSACTIONS - Outstanding Balances (Details) - CAD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Disclosure of transactions between related parties [line items] |  |
Accounts receivable (Note 4) | $ 39.5 | $ 54.0
Accounts payable and accrued liabilities (Note 9) | 9.7 | 15.3
Joint ventures |  |
Disclosure of transactions between related parties [line items] |  |
Accounts receivable (Note 4) | 39.5 | 54.0
Contracts in progress: assets | 14.5 | 14.2
Other assets | 25.4 | 27.4
Accounts payable and accrued liabilities (Note 9) | 9.7 | 15.3
Contracts in progress: liabilities | $ 3.9 | $ 25.9

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