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INCOME TAXES - Non-capital Losses (Details)
$ in Millions
Mar. 31, 2022
CAD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unrecognized $ 201.2
Recognized 382.1
2023-2027  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unrecognized 29.1
Recognized 18.4
2028-2041  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unrecognized 27.5
Recognized 198.7
No expiry date  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unrecognized 144.6
Recognized $ 165.0