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FINANCIAL RISK MANAGEMENT - Net Income and Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income (loss) $ 150.0 $ (47.5)
Other comprehensive loss (13.2) (140.1)
USD | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income (loss) (5.6) 7.9
Other comprehensive loss (8.0) 28.9
€ | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income (loss) (2.1) 4.6
Other comprehensive loss (0.7) (3.8)
GBP | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income (loss) 0.0 (0.5)
Other comprehensive loss $ 0.1 $ (0.7)