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Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Reconciliation to Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | $ 358.3 |  | $ 347.2 |  |  |
Whole Life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 24.8 | $ 24.6 | 23.8 | $ 23.4 | $ 23.0 | $ 22.3
Term Life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 35.3 | 34.8 | 34.2 | 33.8 | 33.5 | 32.6
Experience life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 5.3 | 5.4 | 5.5 | 5.6 | 5.6 | 5.7
Limited-Pay Whole Life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 8.2 | 8.1 | 8.0 | 7.8 | 7.7 | 7.4
Indexed Universal Life |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 21.4 | 20.3 | 19.2 | 18.3 | 17.8 | 16.8
Supplemental health |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 12.8 | 12.1 | 10.6 | 9.9 | 9.3 | 8.2
Total Annuities |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | 208.8 | $ 209.4 | 211.4 | $ 212.0 | $ 212.4 | $ 214.0
Reconciling items |  |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | $ 41.7 |  | $ 34.5 |  |  |

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