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FINANCIAL RISK MANAGEMENT - Net Income and Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income $ 355.7 $ 256.6
Other comprehensive income (loss) 43.3 (13.9)
USD/CDN | Currency risk    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income 4.6 (3.3)
Other comprehensive income (loss) (17.3) (10.6)
EUR/CDN | Currency risk    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income 0.6 0.2
Other comprehensive income (loss) (1.6) (0.8)
GBP/CDN | Currency risk    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income (0.3) (0.5)
Other comprehensive income (loss) $ (1.6) $ (1.7)