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Segment Information - Pre-tax income (loss) from exited business (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pre-tax income (loss) from exited business: |  |  |
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)
Total pre-tax income (loss) from exited business | (1,129.8) | 4,260.1 |
Operating Segments |  |  |
Pre-tax income (loss) from exited business: |  |  |
Change in fair value of funds withheld embedded derivative | (1,085.7) | 3,652.8 |
Net realized capital gains on funds withheld assets | 165.0 | 749.4 |
Strategic review costs and impacts on pre-tax income (loss) |  | 40.4 |
Amortization of reinsurance loss | (68.7) | (56.7) |
Other impacts of reinsured business | (140.4) | (125.8) |
Total pre-tax income (loss) from exited business | $ (1,129.8) | $ 4,260.1 |

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