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Property, Plant and Equipment - Additional Information (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment      
Carrying amount $ 25,753 $ 28,871 $ 49,065
Expenditures 0 0 0
Gross carrying amount      
Property, Plant and Equipment      
Carrying amount $ 48,191 $ 49,140 $ 72,446
A power plant      
Property, Plant and Equipment      
Percentage of pre tax discount rate used to determine expected future cash flows 9.10% 8.80%  
Impairments $ 0    
Reasonably possible increase in discount rate (as a percent) 1.00%    
Change in groups net income $ 0    
A power plant | Gross carrying amount      
Property, Plant and Equipment      
Carrying amount $ 23,429 $ 25,792