Comprehensive Income (Tables)

12 Months Ended

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.