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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity [Abstract] |
Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income | The following tables detail the changes in the balances of each component of accumulated other comprehensive income for the affected periods:
|  | Year Ended December 31, 2024: |  | Year ended December 31, 2023:
|  | Unrealized Gains (Losses) on Available- for Sale Securities (1) |  | Amortization of Postretirement Benefit (1) |  | Gain (Loss) on Foreign Currency Translation (1) |  | Credit Risk Changes of Fair Value Option Liabilities (1) (2) |  | Total |  | Unrealized Gains (Losses) on Available- for Sale Securities (1) |  | Amortization of Postretirement Benefit (1) |  | Gain (Loss) on Foreign Currency Translation (1) |  | Credit Risk Changes of Fair Value Option Liabilities (1) (2) |  | Total
Beginning Balance |  | $ | (20,197) |  |  | $ | 4,939 |  |  | $ | (144,035) |  |  | $ | (753) |  |  | $ | (160,047) |  |  | $ | (71,381) |  |  | $ | 3,370 |  |  | $ | (184,167) |  |  | $ | (665) |  |  | $ | (252,843) |
Other comprehensive income (loss) before reclassifications |  | 3,583 |  |  | (67) |  |  | (22,156) |  |  | — |  |  | (18,640) |  |  | 30,623 |  |  | 3,051 |  |  | 40,132 |  |  | — |  |  | 73,806 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | (4,522) |  |  | (4,872) |  |  | — |  |  | (356) |  |  | (9,750) |  |  | 20,561 |  |  | (1,482) |  |  | — |  |  | (88) |  |  | 18,991 |
Net current period other comprehensive income (loss) |  | (939) |  |  | (4,939) |  |  | (22,156) |  |  | (356) |  |  | (28,390) |  |  | 51,184 |  |  | 1,569 |  |  | 40,132 |  |  | (88) |  |  | 92,797 |
Ending balance |  | $ | (21,136) |  |  | $ | — |  |  | $ | (166,191) |  |  | $ | (1,109) |  |  | $ | (188,436) |  |  | $ | (20,197) |  |  | $ | 4,939 |  |  | $ | (144,035) |  |  | $ | (753) |  |  | $ | (160,047) |
(1)All amounts are net of tax and NCI. Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income. (2)Represents the changes in fair value attributable to instrument-specific credit risk of liabilities for which the fair value option is elected.
Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income | The following table details the significant amounts reclassified from each component of accumulated other comprehensive income, shown in the above rollforward tables, for the affected periods:
Details about Accumulated Other Comprehensive Income Components |  | Amount Reclassified from Accumulated Other Comprehensive Income |  | Affected Line Item in the Consolidated Statement of Total Comprehensive Income
| Year Ended December 31, |
| 2024 |  | 2023 |
Unrealized Gains (Losses) on Available-for-Sale Securities (1) |  |  |  |  |  |
|  | $ | (3,919) |  |  | $ | 22,489 |  |  | Net realized investment gains (losses)
|  | (603) |  |  | (1,928) |  |  | Provision for income taxes
|  | $ | (4,522) |  |  | $ | 20,561 |  |  | Net of tax and NCI
Amortization of Postretirement Benefit |  |  |  |  |  |
Prior service cost |  | $ | (210) |  |  | $ | (963) |  |  | Other income
Actuarial gains (losses) |  | (67) |  |  | (519) |  |  | Other income
Curtailment gain |  | (4,662) |  |  | — |  |  | Other income
|  | (4,939) |  |  | (1,482) |  |  | Total before tax
|  | — |  |  | — |  |  | Provision for income taxes
|  | $ | (4,939) |  |  | $ | (1,482) |  |  | Net of tax and NCI
Credit Risk Changes of Fair Value Option Liabilities |  |  |  |  |  |
|  | $ | (474) |  |  | $ | 89 |  |  | Credit risk changes of fair value option liabilities
|  | 118 |  |  | (177) |  |  | Provision for income taxes
|  | (356) |  |  | (88) |  |  | Net of tax and NCI
Total reclassifications for the period |  | $ | (9,817) |  |  | $ | 18,991 |  |  | Net of tax and NCI
(1)Net unrealized investment gains (losses) on available for sale securities are included in Ambac's Consolidated Statements of Comprehensive Income as a component of Accumulated Other Comprehensive Income. Changes in these amounts include reclassification adjustments to exclude from "Other comprehensive income (loss)" those items that are included as part of "Net income" for a period that has been part of "Other comprehensive income (loss)" in earlier periods.

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