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RELATED PARTY TRANSACTIONS - Outstanding Balances (Details) - CAD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Disclosure of transactions between related parties [line items]    
Accounts receivable (Note 10) $ 40.3 $ 29.4
Contract assets 642.4  
Accounts payable and accrued liabilities (Note 17) 5.1 5.8
Contract liabilities 276.2 309.0
Joint ventures    
Disclosure of transactions between related parties [line items]    
Accounts receivable (Note 10) 49.7 33.3
Contract assets 23.0 14.3
Other non-current assets 12.8 26.4
Accounts payable and accrued liabilities (Note 17) 5.1 5.8
Contract liabilities 46.5 22.0
Other non-current liabilities $ 1.5 $ 1.5