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FINANCIAL RISK MANAGEMENT - Net Income and Other Comprehensive Income (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Net income | $ 355.7 | $ 256.6
Other comprehensive income (loss) | 43.3 | (13.9)
USD/CDN | Currency risk |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Net income | 4.6 | (3.3)
Other comprehensive income (loss) | (17.3) | (10.6)
EUR/CDN | Currency risk |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Net income | 0.6 | 0.2
Other comprehensive income (loss) | (1.6) | (0.8)
GBP/CDN | Currency risk |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Net income | (0.3) | (0.5)
Other comprehensive income (loss) | $ (1.6) | $ (1.7)

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