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CAPITAL RISK MANAGEMENT (Details) - CAD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Capital Risk Management [Abstract]
Long-term debt	$ 2,351.5	$ 3,312.2
Less: cash and cash equivalents	(926.1)	(946.5)	$ (446.1)
Net debt	1,425.4	2,365.7
Equity	3,212.8	2,578.3	$ 2,382.5
Total net debt plus equity	$ 4,638.2	$ 4,944.0

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Capital Risk Management [Abstract]

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Long-term Debt, Gross

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Non-Current Borrowings, Less Cash and Cash Equivalents

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Non-Current Borrowings, Less Cash and Cash Equivalents Plus Equity

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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