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v3.25.1

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

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