XML 174 R152.htm IDEA: XBRL DOCUMENT v3.24.1.1.u2
FINANCIAL RISK MANAGEMENT - Net Income and Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Strengthening in the relevant foreign currency against the Canadian dollar (in percent) 5.00%  
Net (loss) income $ (296.3) $ 231.9
Other comprehensive income from continuing operations (1.4) 257.0
USD | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net (loss) income 0.6 0.5
Other comprehensive income from continuing operations (15.7) (10.9)
€ | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net (loss) income (1.3) 0.6
Other comprehensive income from continuing operations (1.9) (5.0)
GBP | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net (loss) income 0.0 0.2
Other comprehensive income from continuing operations $ (0.2) $ (0.1)