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RELATED PARTY TRANSACTIONS - Outstanding Balances (Details) - CAD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Disclosure of transactions between related parties [line items]    
Accounts receivable (Note 9) $ 57.5 $ 40.3
Contract assets 735.7 642.4
Accounts payable and accrued liabilities (Note 16) 5.7 5.1
Contract liabilities 264.0 276.2
Joint ventures    
Disclosure of transactions between related parties [line items]    
Accounts receivable (Note 9) 59.5 49.7
Contract assets 25.6 23.0
Other non-current assets 17.1 12.8
Accounts payable and accrued liabilities (Note 16) 5.7 5.1
Contract liabilities 58.0 46.5
Other non-current liabilities $ 0.0 $ 1.5