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Long-Duration Insurance Contracts - Amounts Recognized in the Statement of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | $ 60.1 | $ 60.1 | $ 177.0 | $ 178.3
Interest expense | 18.8 | 18.9 | 56.5 | 56.8
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 7.1 | 7.2 | 20.9 | 20.5
Interest expense | 3.1 | 3.0 | 9.1 | 8.8
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 11.1 | 11.7 | 33.3 | 33.9
Interest expense | 1.4 | 1.2 | 4.0 | 3.6
Experience Life Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 8.5 | 8.1 | 23.9 | 24.2
Interest expense | 10.7 | 10.9 | 32.3 | 32.8
Limited Pay Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 1.8 | 2.2 | 5.2 | 5.5
Interest expense | 0.7 | 0.6 | 2.1 | 1.9
Supplemental health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 30.3 | 30.0 | 90.7 | 89.7
Interest expense | 1.9 | 2.1 | 5.8 | 6.4
Life Contingent SPIA Retirement Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 1.3 | 0.9 | 3.0 | 4.5
Interest expense | $ 1.0 | $ 1.1 | $ 3.2 | $ 3.3

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