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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

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