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Income Taxes - Summary of Loss Carryforwards and Deductible Temporary Differences (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences $ 1.1 $ 9.2
Non-capital tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 70.5 109.0
Non-capital tax losses | Expire (2021 to 2040)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 37.0 37.8
Non-capital tax losses | Never expire    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 33.5 71.2
Capital tax losses | Never expire    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 2.6 6.8
Non-capital and capital tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses $ 74.2 $ 125.0