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FINANCIAL RISK MANAGEMENT - Net Income and Other Comprehensive Income (Details) - CAD ($)
$ in Millions

12 Months Ended

Mar. 31, 2020

Mar. 31, 2019

Disclosure of sensitivity analysis for actuarial assumptions [line items]

Net income

$ 318.9

^[1],[2]

$ 340.1

Other comprehensive income (loss)

7.2

(55.3)

USD/CDN | Currency risk

Disclosure of sensitivity analysis for actuarial assumptions [line items]

Net income

4.8

3.0

Other comprehensive income (loss)

(19.6)

(17.2)

EUR/CDN | Currency risk

Disclosure of sensitivity analysis for actuarial assumptions [line items]

Net income

(0.5)

(0.4)

Other comprehensive income (loss)

(3.1)

(4.0)

GBP/CDN | Currency risk

Disclosure of sensitivity analysis for actuarial assumptions [line items]

Net income

0.2

1.2

Other comprehensive income (loss)

$ (0.4)

$ (0.2)

[1]	Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.
[2]	Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.

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