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Income Taxes - Summary of Loss Carryforwards and Deductible Temporary Differences (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences $ 0.2 $ 1.1
Non-capital tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 113.8 70.5
Non-capital tax losses | Expire (2022 to 2041)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 72.0 37.0
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 41.8 33.5
Capital tax losses | Never expire    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 2.5 2.6
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 $ 116.5 $ 74.2