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Debt (Equipment Loans) (Details)
12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Nov. 03, 2023
CAD ($)
Mar. 31, 2023
USD ($)
Equipment Loan, Non-Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Repayment of credit facility $ 41,000,000 $ 40,000,000    
Equipment Loan, Non-Revolving Credit Facility [Member] | Minimum [Member]        
Line of Credit Facility [Line Items]        
Term of issuance 15 years      
Equipment Loan, Non-Revolving Credit Facility [Member] | Maximum [Member]        
Line of Credit Facility [Line Items]        
Term of issuance 20 years      
Equipment Loan, Non-Revolving Credit Facility Due March 2024 [Member]        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity       $ 304,000,000
Equipment Loan, Non-Revolving Credit Facility Due November 2024 [Member]        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     $ 366,000,000  
Non-Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Outstanding borrowings $ 677,000,000 $ 734,000,000    
Interest rate 6.09% 5.22%    
Available borrowing capacity $ 769,000,000 $ 0