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RELATED PARTY TRANSACTIONS - Compensation Of Key Management Personnel (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of related party transactions [Abstract]    
Salaries and other short-term employee benefits $ 6.4 $ 7.0
Post-employment benefits – defined benefit plans 1.9 1.8
Share-based payments 18.9 17.8
Key management personnel compensation $ 27.2 $ 26.6