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Long-Duration Insurance Contracts - Amounts Recognized in the Statement of Operations (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | $ 59.4 | $ 59.2
Interest expense | 18.8 | 18.9
Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 7.0 | 6.9
Interest expense | 3.1 | 3.0
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 11.7 | 11.2
Interest expense | 1.4 | 1.3
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 7.4 | 7.7
Interest expense | 10.6 | 10.8
Limited-Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 1.8 | 1.8
Interest expense | 0.8 | 0.7
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 30.9 | 30.4
Interest expense | 1.8 | 2.0
SPIA (life contingent) |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 0.6 | 1.2
Interest expense | $ 1.1 | $ 1.1

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