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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Tax [Abstract]    
(Loss) earnings before income taxes $ (390.4) $ 292.4
Canadian statutory income tax rates (in percent) 26.50% 26.53%
Income taxes at Canadian statutory rates $ (103.5) $ 77.6
Effect of differences in tax rates in other jurisdictions 7.4 (4.0)
Non-deductible impairment of goodwill 41.6 0.0
Unrecognized tax benefits 18.3 0.9
Non-taxable revenues (4.1) (3.2)
Tax impact on after-tax profit of equity accounted investees (18.8) (13.0)
Prior years' tax adjustments (14.4) 1.1
Other 0.7 3.2
Income tax (recovery) expense $ (72.8) $ 62.6
Effective tax rate (in percent) 19.00% 21.00%