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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Tax [Abstract]    
Earnings (loss) before income taxes $ 153.6 $ (87.2)
Canadian statutory income tax rates (in percent) 26.54% 26.53%
Income taxes at Canadian statutory rates $ 40.8 $ (23.1)
Effect of differences in tax rates in other jurisdictions (16.8) (5.8)
Unrecognized tax benefits and tax benefits not previously recognized 2.2 3.2
Non-deductible expenses (non-taxable revenues) 1.5  
Non-deductible expenses (non-taxable revenues)   (4.8)
Tax impact on after-tax profit of equity accounted investees (12.1) (1.1)
Prior years' tax adjustments (1.5) (6.3)
Other (10.5) (1.8)
Income tax expense (recovery) $ 3.6 $ (39.7)