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Segment Information - Income Tax Expense (Benefit) Related to Exited Business (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Information: Income tax expense (benefit) |  |  |
Change in fair value of funds withheld embedded derivative | $ (1,085.7) | $ 3,652.8 | $ 0.0
Net realized capital gains on funds withheld assets | 165.0 | 749.4 |
Amortization of reinsurance loss | (17.7) | (19.3) | $ (23.0)
Reconciling Items |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Change in fair value of funds withheld embedded derivative | (228.0) | 767.1 |
Net realized capital gains on funds withheld assets | 34.6 | 157.4 |
Strategic review costs and impacts | (0.9) | 70.3 |
Amortization of reinsurance loss | (14.4) | (12.0) |
Other impacts of reinsured business | (29.4) | (26.4) |
Total income tax expense (benefit) related to exited business | $ (238.1) | $ 956.4 |

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