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Investments (Tables)
 6 Months Ended
Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity
The amortized cost and estimated fair value of available-for-sale investments, at June 30, 2025, by contractual maturity, were as follows:
Amortized
Cost		Estimated
Fair Value
Due in one year or less$138,597 $138,260 
Due after one year through five years53,212 52,386 
Due after five years through ten years62,642 61,934 
Due after ten years978 980 
255,429 253,560 
Residential mortgage-backed securities3,352 3,362 
Commercial mortgage-backed securities1,935 1,920 
Collateralized debt obligations2,642 2,652 
Other asset-backed securities2,544 2,561 
Total$265,902 $264,055 
Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments
The following table shows gross unrealized losses and fair values of Ambac’s available-for-sale investments, which at June 30, 2025, and December 31, 2024, did not have an allowance for credit losses. This information is aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at June 30, 2025, and December 31, 2024:
June 30, 2025December 31, 2024
Less Than 12 Months12 Months or MoreTotalLess Than 12 Months12 Months or MoreTotal
Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss
Fixed maturity securities:
Municipal obligations$1,329 $31 $6,042 $310 $7,371 $341 $6,042 $112 $6,582 $458 $12,624 $570 
Corporate obligations9,555 59 35,650 2,540 45,205 2,599 23,784 269 46,612 3,636 70,396 3,905 
U.S. government obligations4,714 43 11,932 265 16,646 308 15,919 344 14,818 465 30,737 809 
Residential mortgage-backed securities1,805 18 — — 1,805 18 2,446 29 — — 2,446 29 
Commercial mortgage-backed securities754 17 — — 754 17 738 34 — — 738 34 
Collateralized debt obligations566 1 — — 566 1 655 2 — — 655 2 
Other asset-backed securities848 2 — — 848 2 1,428 2 — — 1,428 2 
19,571 171 53,624 3,115 73,195 3,286 51,012 792 68,012 4,559 119,024 5,351 
Short-term749 — — — 749 — — — — — — — 
20,320 171 53,624 3,115 73,944 3,286 51,012 792 68,012 4,559 119,024 5,351 
Total temporarily impaired securities$20,320 $171 $53,624 $3,115 $73,944 $3,286 $51,012 $792 $68,012 $4,559 $119,024 $5,351 
Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments
The following table details investment gains (losses) and impairments included in earnings within Other revenues for the affected periods:
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Gross realized gains on securities$2 $6,058 $2 $6,062 
Gross realized losses on securities— (43)(3)(46)
Foreign exchange gains (losses) — — — — 
Credit impairments— (1,480)— (1,480)
Intent / requirement to sell impairments— — — — 
Net investment gains (losses), including impairments$2 $4,535 $(1)$4,536 
Equity Method Investments [Table Text Block] O
Summary of Net Investment Income
Net investment income (loss) was comprised of the following for the affected periods:
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Fixed maturity securities$1,470 $1,263 $2,870 $2,434 
Short-term investments1,191 2,988 2,648 5,577 
Loans35 — 69 — 
Investment expense(87)(102)(84)(193)
Securities available-for-sale and short-term2,609 4,149 5,503 7,818 
Fixed maturity securities - trading— (386)(79)(415)
Total net investment income (loss)$2,609 $3,763 $5,424 $7,403 
Debt Securities, Available-for-Sale
The amortized cost and estimated fair value of available-for-sale investments, at June 30, 2025, and December 31, 2024, were as follows:
June 30, 2025:December 31, 2024:
Amortized
Cost		Allowance for Credit Losses Gross UnrealizedEstimated
Fair Value		Amortized
Cost		Allowance for Credit LossesGross UnrealizedEstimated
Fair Value
GainsLossesGainsLosses
Fixed maturity securities:
Municipal obligations$14,540 $— $109 $341 $14,308 $14,646 — $7 $570 $14,083 
Corporate obligations93,926 — 773 2,599 92,100 92,990 — 107 3,905 89,192 
U.S. government obligations44,244 — 496 308 44,432 41,706 — 98 809 40,995 
Residential mortgage-backed securities3,352 — 28 18 3,362 2,475 — — 29 2,446 
Commercial mortgage-backed securities1,935 — 2 17 1,920 2,127 — 8 34 2,101 
Collateralized debt obligations2,642 — 11 1 2,652 3,131 — 13 2 3,142 
Other asset-backed securities2,544 — 19 2 2,561 5,049 — 14 2 5,061 
163,183 — 1,438 3,286 161,335 162,124 — 247 5,351 157,020 
Short-term102,719 — 1 — 102,720 127,588 — 13 — 127,601 
Total available-for-sale investments$265,902 $— $1,439 $3,286 $264,055 $289,712 — $260 $5,351 $284,621