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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, 2024 | Mar. 31, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | $ 59.2 | $ 59.1
Interest expense | 18.9 | 19.0
Whole Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 6.9 | 6.6
Interest expense | 3.0 | 2.9
Term Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 11.2 | 10.8
Interest expense | 1.3 | 1.2
Experience Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 7.7 | 8.2
Interest expense | 10.8 | 11.0
Limited Pay Whole Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 1.8 | 1.6
Interest expense | 0.7 | 0.6
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 30.4 | 29.7
Interest expense | 2.0 | 2.2
Life Contingent SPIA Retirement Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 1.2 | 2.2
Interest expense | $ 1.1 | $ 1.1

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