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Long-Term Notes (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Apr. 01, 2024
CAD ($)
Apr. 27, 2023
CAD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]            
Long-term notes     $ 1,932,890 $ 1,562,361    
Borrowings, interest rate 7.50%          
Loan repayments     780,900      
Changes in reported amount of U.S. denominated debt     158,800      
Net proceeds from issuance of long-term notes     780,936 1,046,197    
Unamortized debt issuance costs     25,023 40,424    
Principal            
Disclosure of detailed information about borrowings [line items]            
Long-term notes     1,980,619 1,597,475    
Unamortized debt issuance costs            
Disclosure of detailed information about borrowings [line items]            
Long-term notes     $ (47,729) (35,114)    
8.75% Notes Due April 1, 2027            
Disclosure of detailed information about borrowings [line items]            
Notional amount $ 409,800         $ 409.8
Borrowings, redeemable interest rate 104.375%          
8.75% Notes Due April 1, 2027 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate 8.75%   8.75%   8.75%  
Loan repayments     $ 556,600      
8.75% Notes Due April 1, 2027 | Principal            
Disclosure of detailed information about borrowings [line items]            
Long-term notes     $ 0 541,114    
8.50% notes due April 1, 2030            
Disclosure of detailed information about borrowings [line items]            
Notional amount   $ 800,000     $ 800.0 800.0
Borrowings, redeemable interest rate   98.709%        
Net proceeds from issuance of long-term notes   $ 1,000,000        
Unamortized debt issuance costs   13,700        
Transaction costs   $ 18,500        
8.50% notes due April 1, 2030 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   8.50% 8.50%   8.50%  
8.50% notes due April 1, 2030 | Principal            
Disclosure of detailed information about borrowings [line items]            
Long-term notes     $ 1,152,360 1,056,361    
7.375% notes due March 15, 2032            
Disclosure of detailed information about borrowings [line items]            
Notional amount $ 575,000       $ 575.0 $ 0.0
Borrowings, redeemable interest rate 99.266%          
7.375% notes due March 15, 2032 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate 7.375%   7.375%   7.375%  
7.375% notes due March 15, 2032 | Principal            
Disclosure of detailed information about borrowings [line items]            
Long-term notes     $ 828,259 $ 0