Long-Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Net realized gains on extinguishment of debt	$ (497,000)	$ 19,000	$ (13,710,000)
Short Term Debt Duration Fee	$ 0.01
Ambac Assurance Corporation | 5.1% Surplus Notes, General Account, Due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate	5.10%
Long-term debt	$ 503,139,000
Long-term debt, gross	$ 519,235,000
Ambac UK | Secured Debt
Debt Instrument [Line Items]
Debt instrument, interest rate	0.00%
Long-term debt	$ 18,079,000
Long-term debt, gross	$ 40,600,000
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Current Rate
Debt Instrument [Line Items]
Short-Term Debt, Percentage Bearing Variable Interest Rate	4.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | First Rate Increase
Debt Instrument [Line Items]
Short-Term Debt, Percentage Bearing Variable Interest Rate	5.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Second Rate Increase
Debt Instrument [Line Items]
Short-Term Debt, Percentage Bearing Variable Interest Rate	6.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Third Rate Increase
Debt Instrument [Line Items]
Short-Term Debt, Percentage Bearing Variable Interest Rate	7.50%