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Income Taxes - Summary of Loss Carryforwards and Deductible Temporary Differences (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences $ 0.1 $ 0.2
Non-capital tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 71.5 113.8
Non-capital tax losses | Expire (2023 to 2042)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 29.7 72.0
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 41.8
Capital tax losses | Never expire    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 7.8 2.5
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 $ 79.4 $ 116.5