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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, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | $ 239.0 | $ 236.8
Interest expense | 75.7 | 75.8
Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 28.1 | 25.9
Interest expense | 11.8 | 11.3
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 45.2 | 42.4
Interest expense | 4.8 | 4.4
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 32.1 | 33.5
Interest expense | 43.7 | 44.2
Limited-pay whole life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 7.2 | 8.1
Interest expense | 2.6 | 2.4
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 120.3 | 121.2
Interest expense | 8.4 | 9.1
SPIA (life contingent) |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 6.1 | 5.7
Interest expense | $ 4.4 | $ 4.4

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