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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
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net income | $ 522.0 | $ (16.0) | $ (437.0)
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments | (11.0) | (13.0) | (15.0)
Net investment gains (losses), including impairments | (31.0) | (7.0) | (22.0)
Share-based compensation | 17.0 | 14.0 | 11.0
Proceeds from Contributions from Affiliates | 6.0 | 6.0 |
Other, net | (152.0) | (33.0) | 67.0
Net cash provided by (used in) operating activities | 1,335.0 | (131.0) | (175.0)
Cash flows from investing activities: |  |  |
Proceeds from matured bonds | 206.0 | 698.0 | 137.0
Purchases of bonds | (403.0) | (343.0) | (975.0)
Change in short-term investments | (52.0) | 98.0 | 158.0
Proceeds from Sale and Maturity of Other Investments | 166.0 | 39.0 | 374.0
Payments for (Proceeds from) Other Investing Activities | 9.0 | (5.0) | 1.0
Net cash provided by investing activities | 866.0 | 776.0 | 432.0
Cash flows from financing activities: |  |  |
Net Cash Provided by (Used in) Financing Activities | (2,163.0) | (657.0) | (303.0)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect | 38.0 | (12.0) | (46.0)
Cash and cash equivalents at beginning of period | 17.0 | 20.0 |
Cash and cash equivalents end of period | 31.0 | 17.0 | 20.0
Cash paid during the period for: |  |  |
Income taxes | 6.0 | 15.0 | 11.0
Payments to Acquire Businesses, Net of Cash Acquired | (18.0) | 0.0 | (74.0)
Payments for Repurchase of Common Stock | (14.2) |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 522.0 | (17.0) | (437.0)
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |
Equity in undistributed net (income) loss of non-debtor subsidiaries | (542.0) | 1.0 | 423.0
Accretion (Amortization) of Discounts and Premiums, Investments | (7.0) | (9.0) | (6.0)
Net investment gains (losses), including impairments | 14.0 | 5.0 | 1.0
Decrease in current income taxes payable | (1.0) | 1.0 | 30.0
Share-based compensation | 12.0 | 14.0 | 11.0
Decrease in other assets | 41.0 | (5.0) | (1.0)
Other, net | 1.0 | (6.0) | (10.0)
Net cash provided by (used in) operating activities | 46.0 | (10.0) | 11.0
Cash flows from investing activities: |  |  |
Proceeds from matured bonds | 68.0 | 33.0 | 46.0
Purchases of bonds | (1.0) | (34.0) | (45.0)
Change in short-term investments | (51.0) | 105.0 | 89.0
Proceeds from Sale and Maturity of Other Investments | (4.0) | (8.0) | 0.0
Net cash provided by investing activities | 12.0 | 95.0 | 16.0
Capital Contribution to Subsidiaries | (42.0) | (92.0) | (29.0)
Cash flows from financing activities: |  |  |
Net Cash Provided by (Used in) Financing Activities | (57.0) | (92.0) | (29.0)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect | 1.0 | (6.0) | (2.0)
Cash and cash equivalents at beginning of period | 1.0 | 7.0 | 9.0
Cash and cash equivalents end of period | 3.0 | 1.0 | 7.0
Cash paid during the period for: |  |  |
Income taxes | 0.0 | $ 0.0 | $ 0.0
Payments for Repurchase of Common Stock | (14.0) |  |
Parent [Member] |  |  |
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |
Net investment gains (losses), including impairments | $ (4.0) |  |

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