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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Tax [Abstract]    
Earnings before income taxes $ 392.7 $ 399.7
Canadian statutory income tax rates 26.64% 26.72%
Income taxes at Canadian statutory rates $ 104.6 $ 106.8
Effect of differences in tax rates in other jurisdictions (19.9) (13.4)
Effect of differences in tax rates in other jurisdictions 3.4 (33.0)
Non-taxable revenues (6.2) (5.5)
Non-taxable revenues (6.1) (8.0)
Income tax expense (2.0) 12.7
Income tax expense $ 73.8 [1] $ 59.6
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.