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Long-Duration Insurance Contracts - Reconciliation of LFPB to Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | $ 1,655.0 | $ 1,761.8
Whole life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 280.0 | 298.8
Term life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 127.8 | 130.2
Experience Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 757.3 | 811.3
Limited Pay Whole Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 53.6 | 57.4
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 220.4 | 245.6
Life Contingent SPIA Retirement Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 98.5 | 104.2
Limited-pay whole life DPL |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 4.5 | 4.1
SPIA (life contingent) DPL |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 1.4 | 1.3
Reconciling items |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | $ 111.5 | $ 108.9

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