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INCOME TAXES - Non-capital Losses (Details)
$ in Millions
Mar. 31, 2020
CAD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised $ 175.2
Unused tax losses for which deferred tax asset recognised 136.2
2021 - 2025  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 18.2
Unused tax losses for which deferred tax asset recognised 1.2
2026 - 2039  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 116.0
Unused tax losses for which deferred tax asset recognised 50.5
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 41.0
Unused tax losses for which deferred tax asset recognised $ 84.5