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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | $ 2,578.3 | $ 2,382.5
Other comprehensive (loss) income | (140.1) | 7.2
Balances, end of year | 3,212.8 | 2,578.3
Foreign currency translation |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 225.9 | 208.9
Other comprehensive (loss) income | (161.4) | 17.0
Balances, end of year | 64.5 | 225.9
Net change in cash flow hedges |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | (33.3) | (10.5)
Other comprehensive (loss) income | 28.1 | (22.8)
Balances, end of year | (5.2) | (33.3)
Net changes in available-for-sale financial instruments |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 0.6 | 0.6
Other comprehensive (loss) income | (1.8) | 0.0
Balances, end of year | (1.2) | 0.6
Accumulated other comprehensive income |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 193.2 | 199.0
Other comprehensive (loss) income | (135.1) | (5.8)
Balances, end of year | $ 58.1 | $ 193.2

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