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FINANCIAL RISK MANAGEMENT - Net Income and Other Comprehensive Income (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Net Income (loss) | $ (47.5) | $ 318.9
Other comprehensive (loss) income | (140.1) | 7.2
USD/CDN | Currency risk |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Net Income (loss) | 7.9 | 4.8
Other comprehensive (loss) income | 28.9 | (19.6)
EUR/CDN | Currency risk |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Net Income (loss) | 4.6 | (0.5)
Other comprehensive (loss) income | (3.8) | (3.1)
GBP/CDN | Currency risk |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Net Income (loss) | (0.5) | 0.2
Other comprehensive (loss) income | $ (0.7) | $ (0.4)

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