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BALANCE FROM CONTRACTS WITH CUSTOMERS - Net Contract Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Revenue From Contracts With Customers1 [Abstract]    
Contract assets $ 537.6 $ 693.8
Contract assets - non-current (Note 16) 41.6 41.9
Contract liabilities - current (911.7) (905.7)
Contract liabilities - non-current (Note 21) (99.8) (94.0)
Net contract liabilities $ (432.3) $ (264.0)