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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | $ 2,081.0 | $ 1,940.3
OCI | 43.3 | (13.9)
Balances, end of year | 2,366.6 | 2,081.0
Foreign currency translation |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 148.6 | 180.0
OCI | 81.7 | (31.4)
Balances, end of year | 230.3 | 148.6
Net change in cash flow hedges |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | (4.3) | (15.6)
OCI | (0.5) | 11.3
Balances, end of year | (4.8) | (4.3)
Net changes in available-for-sale financial instruments |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 0.5 | 0.7
OCI | 0.1 | (0.2)
Balances, end of year | 0.6 | 0.5
Share in other comprehensive income of equity accounted investees |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 48.9 | 55.6
OCI | (12.7) | (6.7)
Balances, end of year | 36.2 | 48.9
Accumulated other comprehensive income |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year | 193.7 | 220.7
OCI | 68.6 | (27.0)
Balances, end of year | $ 262.3 | $ 193.7

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