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INCOME TAXES - Narrative (Details) - CAD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net deferred tax assets $ 81.5 $ 88.7
Deferred income tax liability 2,866.1 2,468.6
Deductible temporary differences 115.5 $ 118.8
Unrecognized 204.2  
No expiry date    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized 146.0  
Capital Losses | No expiry date    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized $ 19.9