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BALANCE FROM CONTRACTS WITH CUSTOMERS - Net Contract Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Revenue From Contracts With Customers1 [Abstract]    
Contract assets $ 608.3 $ 461.9
Contract assets - non-current 34.1 0.0
Contract liabilities - current (788.3) (674.7)
Contract liabilities - non-current (130.3) (96.2)
Net contract liabilities $ (276.2) $ (309.0)