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Long-Duration Insurance Contracts - Reconciliation of LFPB to Balance Sheet (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | $ 1,635.7 | $ 1,622.8
Whole life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | 279.7 | 275.2
Term life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | 138.4 | 131.8
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | 749.9 | 746.6
Limited-Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | 53.7 | 52.1
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | 203.0 | 203.5
SPIA (life contingent) |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | 97.2 | 97.3
Limited-pay whole life DPL |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | 5.5 | 5.2
SPIA (life contingent) DPL |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | 1.4 | 1.5
Reconciling items |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net liability for future policy benefits | $ 106.9 | $ 109.6

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