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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) Schedule II - Condensed Financial Information of Registrant - Income Taxes (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($)
Operating Loss Carryforwards | $ 1,663,087
AFG [Member] |
Operating Loss Carryforwards | 1,663,087
Ambac Assurance [Member] |
Operating Loss Carryforwards | $ 1,952,621
Ambac Assurance [Member] | Minimum [Member] |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2030
Ambac Assurance [Member] | Maximum [Member] |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2042
Interest Expense | U. S. Federal Net Operating Tax |
Operating Loss Carryforwards | $ 110,494

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