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Income Taxes - Schedule of Loss Carryforwards and Deductible Temporary Differences (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences $ 0.0 $ 0.1
Non-capital tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 49.1 71.5
Non-capital tax losses | Expire (2024 to 2043)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital and capital tax losses 7.2 29.7
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 41.9 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 7.7 7.8
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 $ 56.8 $ 79.4