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Liability for Future Policyholder Benefits - Reconciliation of the Net Liability for Future Benefits to Life and Health Insurance Reserves (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Insurance [Abstract] |  |  |  |  |  |
Net Liability for Future Policyholder Benefits, post-flooring | $ 2,730,800 | $ 2,897,500 | $ 2,730,800 | $ 2,897,500 |  |
Deferred Profit Liability | 460,400 | 390,600 | 460,400 | 390,600 | $ 412,100 | $ 337,800
A&H and Other Reserves | 126,400 | 137,700 | 126,400 | 137,700 |  |
Total Life and Health Insurance Reserves | 3,317,600 | 3,425,800 | 3,317,600 | 3,425,800 |  |
Term Life Insurance |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |
Net Liability for Future Policyholder Benefits, post-flooring | 10,167,100 | 10,274,000 | 10,167,100 | 10,274,000 |  |
Expected Future Gross Premiums, undiscounted | 4,010,900 | 4,159,000 | 4,010,900 | 4,159,000 |  |
Expected Future Gross Premiums, discounted | 2,718,200 | 2,853,800 | 2,718,200 | 2,853,800 |  |
Gross Premiums or Assessments | 99,200 | 99,800 | 299,700 | 300,300 |  |
Interest Expense | $ 34,600 | $ 35,000 | $ 103,700 | $ 104,700 |  |
Interest Accretion Rate | 4.53% | 4.54% | 4.53% | 4.54% |  |
Current Discount Rate | 5.57% | 5.17% | 5.57% | 5.17% |  |

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- Definition Current weighted-average discount rate used to measure liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E + Details
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- Definition Amount of gross premium income recognized for liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E + Details
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- Definition Amount of interest expense recognized for liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E + Details
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