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Asset Retirement Obligations - Additional Information (Details) - Asset retirement obligation - CAD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other provisions [line items]      
Estimated cash flows, undiscounted amount $ 845,000 $ 795,500  
Other provisions $ 640,951 $ 623,399 $ 588,923
Other provisions, period of costs being incurred 55 years    
Canada      
Disclosure of other provisions [line items]      
Estimated inflation rate 1.80% 1.60%  
Estimated risk free rate 3.30% 3.00%  
U.S.      
Disclosure of other provisions [line items]      
Estimated inflation rate 2.30% 2.10%  
Estimated risk free rate 4.80% 4.00%