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BALANCE FROM CONTRACTS WITH CUSTOMERS - Net Contract Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Revenue From Contracts With Customers1 [Abstract]    
Contract assets $ 693.8 $ 608.3
Contract assets - non-current (Note 15) 41.9 34.1
Contract liabilities - current (905.7) (788.3)
Contract liabilities - non-current (Note 20) (94.0) (130.3)
Net contract liabilities $ (264.0) $ (276.2)