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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, 2023 | Mar. 31, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | $ 59.1 | $ 59.5
Interest expense | 19.0 | 19.0
Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 6.6 | 6.1
Interest expense | 2.9 | 2.7
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 10.8 | 9.9
Interest expense | 1.2 | 1.1
Experience Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 8.2 | 8.5
Interest expense | 11.0 | 11.1
Limited Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 1.6 | 1.8
Interest expense | 0.6 | 0.6
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 29.7 | 30.7
Interest expense | 2.2 | 2.4
SPIA (life contingent) |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Gross premiums or assessments | 2.2 | 2.5
Interest expense | $ 1.1 | $ 1.1

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