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BALANCE FROM CONTRACTS WITH CUSTOMERS - Net Contract Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Mar. 31, 2021
Mar. 31, 2020
Revenue From Contracts With Customers1 [Abstract]    
Contract assets $ 461.9 $ 569.3
Contract liabilities - current (674.7) (746.2)
Contract liabilities - non-current (96.2) (83.3)
Net contract liabilities $ (309.0) $ (260.2)