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BALANCE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details)
$ in Millions
12 Months Ended
Mar. 31, 2019
CAD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue that was included in contract liability balance $ 599.4
Revenue from performance obligations satisfied or partially satisfied in previous periods 22.4
Remaining performance obligations $ 5,413.7
No later than 1 year  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Percentage of entity's revenue expected to be recognised 37.00%
Later than one year  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Percentage of entity's revenue expected to be recognised 19.00%