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Long-Duration Insurance Contracts - Amounts Recognized in the Statement of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | $ 57.7 | $ 59.1 | $ 116.9 | $ 118.2
Interest expense | 18.8 | 18.9 | 37.7 | 37.9
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 6.9 | 6.7 | 13.8 | 13.3
Interest expense | 3.0 | 2.9 | 6.0 | 5.8
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 11.0 | 11.4 | 22.2 | 22.2
Interest expense | 1.3 | 1.2 | 2.6 | 2.4
Experience Life Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 7.7 | 7.9 | 15.4 | 16.1
Interest expense | 10.8 | 10.9 | 21.6 | 21.9
Limited Pay Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 1.6 | 1.7 | 3.4 | 3.3
Interest expense | 0.7 | 0.7 | 1.4 | 1.3
Supplemental health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 30.0 | 30.0 | 60.4 | 59.7
Interest expense | 1.9 | 2.1 | 3.9 | 4.3
Life Contingent SPIA Retirement Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Gross premiums or assessments | 0.5 | 1.4 | 1.7 | 3.6
Interest expense | $ 1.1 | $ 1.1 | $ 2.2 | $ 2.2

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