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BALANCE FROM CONTRACTS WITH CUSTOMERS - Net Contract Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2017
Revenue From Contracts With Customers1 [Abstract]        
Contract assets $ 523.5 $ 439.7    
Contract liabilities - current (670.2) (679.5) $ (593.4) $ (593.4)
Contract liabilities - non-current (102.5) (56.2)    
Net contract liabilities $ 249.2 $ 296.0