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Parent Company - Narrative (Details) - Revolving Credit Facility - Line of Credit - Affiliated Entity - USD ($)
$ in Millions
Dec. 31, 2024
Oct. 25, 2013
Line of Credit Facility [Line Items]    
Interest rate, as a percentage of Federal short-term or mid-term interest rate   100.00%
Intercompany Loans Payable | Assured Guaranty LTD    
Line of Credit Facility [Line Items]    
Related party, maximum borrowing capacity   $ 225
Outstanding amount $ 0