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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Tax [Abstract]    
(Loss) earnings before income taxes $ (87.2) $ 392.7
Canadian statutory income tax rates 26.53% 26.64%
Income taxes at Canadian statutory rates $ (23.1) $ 104.6
Effect of differences in tax rates in other jurisdictions (5.8) (19.9)
Unrecognized tax benefits and tax benefits not previously recognized 3.2 3.4
Non-taxable revenues (4.8) (6.2)
Tax impact on after-tax profit of equity accounted investees (1.1) (6.1)
Prior years' tax adjustments (6.3) (4.9)
Other (1.8) 2.9
Income tax (recovery) expense $ (39.7) $ 73.8