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Property, Plant and Equipment - Additional Information (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment      
Carrying amount $ 28,871 $ 49,065 $ 51,883
Gross carrying amount      
Property, Plant and Equipment      
Carrying amount $ 49,140 $ 72,446 $ 72,140
A power plant      
Property, Plant and Equipment      
Percentage of pre tax discount rate used to determine expected future cash flows 8.80% 7.40%  
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 $ 25,792 $ 25,835