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Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Reconciliation to Balance Sheet (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | $ 331.6 | $ 330.6 |  |
Whole Life |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 21.2 | 20.9 | $ 19.1 | $ 17.8
Term Life |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 30.7 | 30.0 | 27.5 | 25.6
Experience Life |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 5.8 | 5.8 | 6.0 | 6.2
Limited Pay Whole Life |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 6.8 | 6.7 | 5.6 | 4.4
Indexed Universal Life |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 15.7 | 15.4 | 13.7 | 12.9
Supplemental health |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 6.7 | 6.2 | 4.9 | 4.3
Total Annuities |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | 219.7 | 221.1 | $ 223.3 | $ 223.1
Reconciling items |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred policy acquisition costs | $ 25.0 | $ 24.5 |  |

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