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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year (restated) | $ 2,297.5 | $ 2,012.3
OCI | (55.3) | 43.9
Balances, end of year | 2,410.0 | 2,297.5
Foreign currency translation |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year (restated) | 266.6 | 197.4
OCI | (57.7) | 69.2
Balances, end of year | 208.9 | 266.6
Net change in cash flow hedges |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year (restated) | (6.9) | (6.8)
OCI | (3.6) | (0.1)
Balances, end of year | (10.5) | (6.9)
Net changes in available-for-sale financial instruments |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year (restated) | 0.6 | 0.5
OCI | 0.0 | 0.1
Balances, end of year | 0.6 | 0.6
Accumulated other comprehensive income |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balances, beginning of year (restated) | 260.3 | 191.1
OCI | (61.3) | 69.2
Balances, end of year | $ 199.0 | $ 260.3

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