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INCOME TAXES - Non-capital Losses (Details)
$ in Millions
Mar. 31, 2019
CAD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised $ 168.9
Unused tax losses for which deferred tax asset recognised 147.4
Tax Year 2019  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 2.4
Unused tax losses for which deferred tax asset recognised 0.1
Tax Year 2020  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0.9
Unused tax losses for which deferred tax asset recognised 0.6
Tax Year 2021  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 1.5
Unused tax losses for which deferred tax asset recognised 2.2
Tax Year 2022  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 5.6
Unused tax losses for which deferred tax asset recognised 0.0
Tax Year 2023  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 5.3
Unused tax losses for which deferred tax asset recognised 0.0
Tax Year 2024  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 2.9
Unused tax losses for which deferred tax asset recognised 0.0
Tax Year 2025 - 2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 115.8
Unused tax losses for which deferred tax asset recognised 48.8
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 34.5
Unused tax losses for which deferred tax asset recognised $ 95.7