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RELATED PARTY TRANSACTIONS - Compensation Of Key Management Personnel (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of related party transactions [Abstract]    
Salaries and other short-term employee benefits $ 7.0 $ 7.1
Post-employment benefits – defined benefit plans 1.8 1.3
Share-based payments 17.8 16.8
Key management personnel compensation $ 26.6 $ 25.2