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INCOME TAXES - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Tax [Abstract]    
Net deferred tax assets $ 88.7 $ 85.8
Deferred income tax liability 2,468.6 2,439.9
Deductible temporary differences $ 118.8 $ 107.4
Deductible temporary differences for which no deferred tax asset is recognised (in years) 25 years