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BALANCE FROM CONTRACTS WITH CUSTOMERS - Net Contract Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Revenue From Contracts With Customers1 [Abstract]    
Contract assets $ 569.3 $ 523.5
Contract liabilities - current (746.2) [1] (670.2)
Contract liabilities - non-current (83.3) (102.5)
Net contract liabilities $ (260.2) $ (249.2)
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.