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Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Reconciliation to Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | $ 351.4 |  | $ 347.2 |  |  |
Whole Life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 24.6 | $ 24.1 | 23.8 | $ 23.0 | $ 22.6 | $ 22.3
Term Life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 34.8 | 34.5 | 34.2 | 33.5 | 32.9 | 32.6
Experience life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 5.4 | 5.4 | 5.5 | 5.6 | 5.7 | 5.7
Limited-Pay Whole Life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 8.1 | 8.0 | 8.0 | 7.7 | 7.5 | 7.4
Indexed Universal Life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 20.3 | 19.8 | 19.2 | 17.8 | 17.1 | 16.8
Supplemental health |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 12.1 | 11.2 | 10.6 | 9.3 | 8.7 | 8.2
Total Annuities |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 209.4 | $ 210.4 | 211.4 | $ 212.4 | $ 212.9 | $ 214.0
Reconciling items |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | $ 36.7 |  | $ 34.5 |  |  |

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