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Long-Duration Insurance Contracts - Amounts Recognized in the Statement of Operations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | $ 237.0 | $ 239.0
Interest expense | 75.2 | 75.7
Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 28.1 | 28.1
Interest expense | 12.2 | 11.8
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 45.9 | 45.2
Interest expense | 5.3 | 4.8
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 30.6 | 32.1
Interest expense | 43.0 | 43.7
Limited-Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 7.2 | 7.2
Interest expense | 2.8 | 2.6
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 121.6 | 120.3
Interest expense | 7.6 | 8.4
SPIA (life contingent) |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 3.6 | 6.1
Interest expense | $ 4.3 | $ 4.4

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