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Long term debt (Narrative) (Details)
 12 Months Ended
Jan. 13, 2025
USD ($)
Sep. 09, 2024
USD ($)
May 24, 2024
CAD ($)
Nov. 07, 2023
CAD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Disclosure of detailed information about borrowings [line items]            
Proceeds of long-term debt           $ 816,582,000
Repayment of borrowings         $ 1,041,590,000 0
Proceeds from debentures         497,022,000  
Revolving Credit Facilities [Abstract]            
Gross Unsecured Revolving Credit Facility Available         1,000,000,000  
Maximum Letters of credit under the facility         100,000,000  
Increase in revolving credit facility with minimum Increments         50,000,000  
Maximum unsecured revolving credit facility         1,250,000,000  
Unsecured loans received         0 0
Outstanding letters of credit facility         1,527,815,000 1,383,689,000
Gross Letters Of Credit Commitments         $ 1,890,028,000 1,771,663,000
Debt to tangible net worth ratio         1  
Credit Facility Maturity         October 1, 2028  
Westinghouse Electric Company [Member]            
Disclosure of detailed information about borrowings [line items]            
Percent acquired in acquisition       49.00%    
US Term Loan [Member]            
Disclosure of detailed information about borrowings [line items]            
Proceeds of long-term debt       $ 600,000,000    
US Term Loan [Member] | Westinghouse Electric Company [Member] | Repayment Of Borrowings Transaction [Member]            
Disclosure of detailed information about borrowings [line items]            
Repayment of borrowings $ 200,000,000          
US Term Loan [Member] | Westinghouse Electric Company [Member] | Major Business Combination [Member]            
Disclosure of detailed information about borrowings [line items]            
Repayment of borrowings   $ 100,000,000        
US Term Loan, Tranche One [Member]            
Disclosure of detailed information about borrowings [line items]            
Proceeds of long-term debt       300,000,000    
US Term Loan, Tranche One [Member] | Floating interest rate [Member]            
Disclosure of detailed information about borrowings [line items]            
Borrowing, interest rate basis         1.80%  
US Term Loan Tranche Two [Member]            
Disclosure of detailed information about borrowings [line items]            
Proceeds of long-term debt       $ 300,000,000    
US Term Loan Tranche Two [Member] | Floating interest rate [Member]            
Disclosure of detailed information about borrowings [line items]            
Borrowing, interest rate basis         2.05%  
Series I [Member]            
Disclosure of detailed information about borrowings [line items]            
Effective interest rate     5.04%      
Interest rate     4.94%   4.94%  
Debenture issuance     $ 500,000,000   $ 497,252,000 0
Proceeds from debentures     497,000,000      
Series G [Member]            
Disclosure of detailed information about borrowings [line items]            
Redemption of debentures     $ 500,000,000      
Interest rate         4.19%  
Debenture issuance         $ 0 $ 499,821,000