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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)

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