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DEBT FACILITIES - Retirement Payments (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disclosure of finance lease and operating lease by lessee [line items] |  |
Required payments related to retirement provisions, long-term debt, gross | $ 2,076.1 | $ 1,117.5
Required payments related to retirement provisions, long-term debt, transaction costs | (7.1) | (2.0)
Required payments related to retirement provisions, long-term debt, net | 2,069.0 | 1,115.5
No later than 1 year |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Required payments related to retirement provisions, long-term debt, gross | 202.0 | 35.6
Later than 1 year and no later than 5 years |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Required payments related to retirement provisions, long-term debt, gross | 414.0 | 450.2
Later than 5 years |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Required payments related to retirement provisions, long-term debt, gross | $ 1,460.1 | $ 631.7

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