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Long-Duration Insurance Contracts - Reconciliation of LFPB to Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | $ 1,740.9 | $ 1,718.0 |  |
Whole life |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | 289.4 | 279.5 |  |
Term life |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | 120.3 | 112.4 |  |
Experience Life |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | 803.5 | 799.3 | $ 1,098.1 | $ 1,191.3
Limited Pay Whole Life |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | 53.7 | 49.6 | 73.2 | 69.5
Supplemental health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | 254.5 | 264.4 | 359.1 | 415.5
SPIA (life contingent) |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | 103.6 | 103.3 | $ 124.7 | $ 136.5
Limited-pay whole life DPL |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | 3.4 | 3.2 |  |
SPIA (life contingent) DPL |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | 1.0 | 0.8 |  |
Reconciling items |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits | $ 111.5 | $ 105.5 |  |

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