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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended | 21 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023
Cash flows from operating activities: |  |  |  |
Net income | $ 5.0 | $ 522.0 | $ (16.0) |
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments | (15.0) | (11.0) | (13.0) |
Net investment gains (losses), including impairments | 22.0 | (31.0) | (7.0) |
Share-based compensation | 17.0 | 17.0 | 14.0 |
Proceeds from Contributions from Affiliates | 8.0 | 6.0 | 6.0 |
Other, net | 13.0 | (196.0) | (56.0) |
Net cash provided by operating activities | 200.0 | 1,335.0 | (131.0) |
Cash flows from investing activities: |  |  |  |
Proceeds from matured bonds | 74.0 | 206.0 | 698.0 |
Purchases of bonds | (415.0) | (403.0) | (343.0) |
Change in short-term investments | 118.0 | (52.0) | 98.0 |
Proceeds from Sale and Maturity of Other Investments | 209.0 | 166.0 | 39.0 |
Payments for (Proceeds from) Other Investing Activities | 6.0 | 9.0 | (5.0) |
Net cash provided by investing activities | 435.0 | 866.0 | 776.0 |
Cash flows from financing activities: |  |  |  |
Net Cash Provided by (Used in) Financing Activities | (423.0) | (2,163.0) | (657.0) |
Cash and cash equivalents at beginning of period | 31.0 | 17.0 |  |
Cash and cash equivalents end of period | 16.0 | 31.0 | 17.0 | $ 16.0
Cash paid during the period for: |  |  |  |
Income taxes | 11.0 | 6.0 | 15.0 |
Payments to Acquire Businesses, Net of Cash Acquired | 7.0 | 18.0 | 0.0 |
Payments for Repurchase of Common Stock | 5.0 | 14.0 |  | 19.0
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |
Cash flows from operating activities: |  |  |  |
Net income | 4.0 | 522.0 | (17.0) |
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |
Equity in undistributed net (income) loss of non-debtor subsidiaries | (15.0) | (542.0) | 1.0 |
Accretion (Amortization) of Discounts and Premiums, Investments | 0.0 | (7.0) | (9.0) |
Net investment gains (losses), including impairments | 0.0 | 14.0 | 5.0 |
Decrease in current income taxes payable | (2.0) | (1.0) | 1.0 |
Share-based compensation | 9.0 | 12.0 | 14.0 |
Decrease in other assets | (5.0) | 41.0 | (5.0) |
Other, net | 2.0 | 1.0 | (6.0) |
Net cash provided by operating activities | 2.0 | 46.0 | (10.0) |
Cash flows from investing activities: |  |  |  |
Proceeds from matured bonds | 0.0 | 68.0 | 33.0 |
Purchases of bonds | (1.0) | (1.0) | (34.0) |
Change in short-term investments | 20.0 | (51.0) | 105.0 |
Proceeds from Sale and Maturity of Other Investments | (3.0) | (4.0) | (8.0) |
Net cash provided by investing activities | 16.0 | 12.0 | 95.0 |
Capital Contribution to Subsidiaries | (16.0) | (42.0) | (92.0) |
Cash flows from financing activities: |  |  |  |
Net Cash Provided by (Used in) Financing Activities | (21.0) | (57.0) | (92.0) |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect | (2.0) | 1.0 | (6.0) |
Cash and cash equivalents at beginning of period | 3.0 | 1.0 | 7.0 |
Cash and cash equivalents end of period | 0.0 | 3.0 | 1.0 | $ 0.0
Cash paid during the period for: |  |  |  |
Income taxes | 0.0 | 0.0 | $ 0.0 |
Payments for Repurchase of Common Stock | $ (5.0) | $ (14.0) |  |

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