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Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Reconciliation to Balance Sheet (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | $ 337.3 | $ 336.3 |  |
Whole Life Insurance |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 22.6 | 22.3 | $ 21.2 | $ 20.9
Term Life Insurance |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 32.9 | 32.6 | 30.7 | 30.0
Experience Life Insurance |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 5.7 | 5.7 | 5.8 | 5.8
Limited Pay Whole Life Insurance |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 7.5 | 7.4 | 6.8 | 6.7
Indexed Universal Life Insurance |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 17.1 | 16.8 | 15.7 | 15.4
Supplemental health |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 8.7 | 8.2 | 6.7 | 6.2
Total Annuities |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 212.9 | 214.0 | $ 219.7 | $ 221.1
Reconciling items |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | $ 29.9 | $ 29.3 |  |

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