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RELATED PARTY TRANSACTIONS - Outstanding Balances (Details) - CAD ($)
$ in Millions
Mar. 31, 2021
Mar. 31, 2020
Disclosure of transactions between related parties [line items]    
Accounts receivable $ 29.4 $ 45.8
Contract assets 461.9  
Accounts payable and accrued liabilities 5.8 5.7
Contract liabilities 309.0 260.2
Joint ventures    
Disclosure of transactions between related parties [line items]    
Accounts receivable 33.3 51.2
Contract assets 14.3 38.5
Other non-current assets 26.4 25.6
Accounts payable and accrued liabilities 5.8 5.7
Contract liabilities 22.0 28.8
Other non-current liabilities $ 1.5 $ 1.7