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INCOME TAXES - Non-capital Losses (Details)
$ in Millions
Mar. 31, 2021
CAD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised $ 188.7
Unused tax losses for which deferred tax asset recognised 188.6
2022 - 2026  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 72.3
Unused tax losses for which deferred tax asset recognised 7.2
2027 - 2040  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 51.7
Unused tax losses for which deferred tax asset recognised 68.2
No expiry date  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 64.7
Unused tax losses for which deferred tax asset recognised $ 113.2