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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | $ 4,302.6 | $ 4,588.9
Other comprehensive (loss) income | 191.8 | (1.4)
Balances, end of year | 4,976.0 | 4,302.6
Foreign currency exchange differences on translation of foreign operations |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 174.5 | 182.8
Other comprehensive (loss) income | 243.2 | (8.3)
Balances, end of year | 417.7 | 174.5
Net change in cash flow hedges |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | (19.2) | (14.3)
Other comprehensive (loss) income | (15.4) | (4.9)
Balances, end of year | (34.6) | (19.2)
Net changes in financial assets carried at FVOCI |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | (1.3) | (1.3)
Other comprehensive (loss) income | 0.0 | 0.0
Balances, end of year | (1.3) | (1.3)
Accumulated other comprehensive income |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 154.0 | 167.2
Other comprehensive (loss) income | 227.8 | (13.2)
Other comprehensive loss (income) excluding cash flow hedges | 227.8 | (13.2)
Balances, end of year | $ 381.8 | $ 154.0

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