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Long-Duration Insurance Contracts - Reconciliation of LFPB to Balance Sheet (Details) - USD ($) $ in Millions | Mar. 31, 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 | $ 1,702.1 | $ 1,761.8
Whole life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 288.3 | 298.8
Term life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 128.3 | 130.2
Experience Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 780.6 | 811.3
Limited Pay Whole Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 55.3 | 57.4
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 231.8 | 245.6
Life Contingent SPIA Retirement Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 101.3 | 104.2
Limited-pay whole life DPL |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 4.3 | 4.1
SPIA (life contingent) DPL |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 1.3 | 1.3
Reconciling items |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | $ 110.9 | $ 108.9

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