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Basis of Presentation and Significant Accounting Policies (Policies) | 3 Months Ended
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Mar. 31, 2024
Accounting Policies [Abstract] |
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] | Consolidation: The consolidated financial statements include the accounts of AFG and all other entities in which AFG (directly or through its subsidiaries) has a controlling financial interest, including variable interest entities (“VIEs”) for which AFG or an AFG subsidiary is deemed the primary beneficiary in accordance with the Consolidation Topic of the Accounting Standards Codification ("ASC"). All significant intercompany balances have been eliminated. See Note 9. Variable Interest Entities, for a detailed discussion of Ambac’s involvement in VIEs, Ambac’s methodology for determining whether Ambac is required to consolidate a VIE and the effects of VIEs being consolidated and deconsolidated.
Basis of Presentation and Significant Accounting Policies [Text Block] | Basis of Presentation: The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required by GAAP for annual periods. These consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2023. The accompanying consolidated financial statements have not been audited by an independent registered public accounting firm in accordance with the standards of the Public Company Accounting Oversight Board (U.S.), but in the opinion of management such financial statements include all adjustments necessary for the fair presentation of the Company’s consolidated financial position and results of operations. The results of operations for the three months ended March 31, 2024, may not be indicative of the results that may be expected for the year ending December 31, 2024. The December 31, 2023, consolidated balance sheet was derived from audited financial statements. The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. As additional information becomes available or actual amounts become determinable, the recorded estimates are revised and reflected in operating results.
Foreign Currency Transactions and Translations Policy [Policy Text Block] | Foreign Currency: The impact of non-functional currency transactions and the remeasurement of non-functional currency assets and liabilities into the respective subsidiaries' functional currency (collectively "foreign currency transactions gains/(losses)") are $0 and $(2) for the three months ended March 31, 2024 and 2023, respectively. Foreign currency transactions gains/(losses) are primarily the result of remeasuring Ambac UK's assets and liabilities denominated in currencies (primarily the U.S. dollar and the Euro) other than its functional currency (the British Pound Sterling).
Noncontrolling Interest Disclosure | Redeemable Noncontrolling Interest: The Riverton, All Trans, Capacity Marine and Xchange acquisitions resulted in 80% 85%, 80% and 80%, respectively, ownership of the acquired entities by Ambac. Under the terms of all the acquisition agreements, Ambac has call options to purchase the remaining interests from the minority owners (i.e., noncontrolling interests) and the minority owners have put options to sell their interests to Ambac. Because the exercise of the put options are outside the control of Ambac, in accordance with the Distinguishing Liabilities from Equity Topic of the ASC, Ambac reports redeemable noncontrolling interests in the mezzanine section of its consolidated balance sheet. The redeemable noncontrolling interest is remeasured each period as the greater of: i.the carrying value under ASC 810, which attributes a portion of consolidated net income (loss) to the redeemable noncontrolling interest, and ii.the redemption value of the put option under ASC 480 as if it were exercisable at the end of the reporting period. Any increase (decrease) in the carrying amount of the redeemable noncontrolling interest as a result of adjusting to the redemption value of the put option is recorded as an offset to retained earnings. The impact of such differences on earnings per share are presented in Note 12. Net Income Per Share. Following is a rollforward of redeemable noncontrolling interest.
Three Months Ended March 31, |  | 2024 |  | 2023
Beginning balance |  | $ | 17 |  |  | $ | 20 |
Fair value of redeemable noncontrolling interest at acquisition date |  | — |  |  | — |
Net income attributable to redeemable noncontrolling interest (ASC 810) |  | 1 |  |  | 1 |
Distributions |  | (1) |  |  | — |
Adjustment to redemption value (ASC 480) |  | — |  |  | — |
Ending balance |  | $ | 17 |  |  | $ | 20 |
Reclassifications | Reclassifications and Rounding Reclassifications may have been made to prior years' amounts to conform to the current year's presentation. Certain amounts and tables in the consolidated financial statements and associated notes may not add due to rounding.
New Accounting Pronouncements, Policy [Policy Text Block] | Adopted Accounting Standards: There have been no new accounting standards adopted during 2024. Future Application of Accounting Standards and Required Disclosures:
Noncontrolling Interest Policy | Redeemable Noncontrolling Interest: The Riverton, All Trans, Capacity Marine and Xchange acquisitions resulted in 80% 85%, 80% and 80%, respectively, ownership of the acquired entities by Ambac. Under the terms of all the acquisition agreements, Ambac has call options to purchase the remaining interests from the minority owners (i.e., noncontrolling interests) and the minority owners have put options to sell their interests to Ambac. Because the exercise of the put options are outside the control of Ambac, in accordance with the Distinguishing Liabilities from Equity Topic of the ASC, Ambac reports redeemable noncontrolling interests in the mezzanine section of its consolidated balance sheet. The redeemable noncontrolling interest is remeasured each period as the greater of: i.the carrying value under ASC 810, which attributes a portion of consolidated net income (loss) to the redeemable noncontrolling interest, and ii.the redemption value of the put option under ASC 480 as if it were exercisable at the end of the reporting period. Any increase (decrease) in the carrying amount of the redeemable noncontrolling interest as a result of adjusting to the redemption value of the put option is recorded as an offset to retained earnings. The impact of such differences on earnings per share are presented in Note 12. Net Income Per Share. Following is a rollforward of redeemable noncontrolling interest.
Three Months Ended March 31, |  | 2024 |  | 2023
Beginning balance |  | $ | 17 |  |  | $ | 20 |
Fair value of redeemable noncontrolling interest at acquisition date |  | — |  |  | — |
Net income attributable to redeemable noncontrolling interest (ASC 810) |  | 1 |  |  | 1 |
Distributions |  | (1) |  |  | — |
Adjustment to redemption value (ASC 480) |  | — |  |  | — |
Ending balance |  | $ | 17 |  |  | $ | 20 |

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- Definition The entire disclosure for the basis of presentation and significant accounting policies concepts. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). Accounting policies describe all significant accounting policies of the reporting entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 235 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//235/tableOfContent + Details
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- Definition Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//830/tableOfContent + Details
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- Definition The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 810 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//810/tableOfContent + Details
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- Definition The entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 235 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//235/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 275 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//275/tableOfContent Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 810 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//810/tableOfContent Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 250 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//250/tableOfContent + Details
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- Definition Disclosure of accounting policy for reclassification affecting comparability of financial statement. Excludes amendment to accounting standards, other change in accounting principle, and correction of error. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 205 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483504/205-10-50-1 + Details
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