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FINANCIAL RISK MANAGEMENT - Net Income and Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income $ 231.9 $ 150.0
Other comprehensive income (loss) 257.0 (13.2)
USD | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income 0.5 (5.6)
Other comprehensive income (loss) (10.9) (8.0)
€ | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income 0.6 (2.1)
Other comprehensive income (loss) (5.0) (0.7)
GBP | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income 0.2 0.0
Other comprehensive income (loss) $ (0.1) $ 0.1