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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) Schedule II - Condensed Financial Information of Registrant - Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |
Operating Loss Carryforwards | $ 1,690,842 |
AFG [Member] |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |
Operating Loss Carryforwards | $ 1,690,842 |
Ambac Assurance [Member] |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |
Operating Loss Carryforwards |  | $ 1,952,621
Ambac Assurance [Member] | Minimum [Member] |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2030 |
Ambac Assurance [Member] | Maximum [Member] |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2042 |
Interest Expense | U. S. Federal Net Operating Tax |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |
Operating Loss Carryforwards |  | $ 110,494

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