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Reinsurance - Funds Withheld (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net assets | $ 18,167.7 |  | $ 18,167.7 |  | $ 18,321.4
Funds withheld payable | 18,010.9 |  | 18,010.9 |  | 18,103.7
Embedded derivative asset | 2,825.2 |  | 2,825.2 |  | 3,014.5
Change in fair value of funds withheld embedded derivative | 20.3 | $ 232.9 | (189.4) | $ 429.9 |
Fixed maturities, available-for-sale |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net assets | 13,865.4 |  | 13,865.4 |  | 13,519.6
Fixed maturities, trading |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net assets | 271.5 |  | 271.5 |  | 299.4
Equity securities |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net assets | 0.3 |  | 0.3 |  | 0.3
Mortgage loans |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net assets | 2,110.6 |  | 2,110.6 |  | 2,212.4
Other investments |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net assets | 1,324.0 |  | 1,324.0 |  | 1,142.8
Cash and cash equivalents |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net assets | 507.9 |  | 507.9 |  | 1,080.1
Accrued interest income |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net assets | 167.8 |  | 167.8 |  | 166.2
Net other assets (liabilities) |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset [Line Items] |  |  |  |  |
Net asset (liability) | $ (79.8) |  | $ (79.8) |  | $ (99.4)

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- Definition Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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