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Future Policy Benefits - Narrative (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
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Future policy benefits remeasurement gain (loss) | $ 23,114 | $ 23,019 | $ 32,282 | $ 27,294 |  |
Future policy benefits, changes in cash flow assumptions |  |  |  |  | $ (436,663) | $ (83,975)
Future policy benefits, realized experience variances |  |  |  |  | $ (333,555) | $ (386,512)
Future policy benefits as level percentage | 100.00% | 100.00% | 100.00% | 100.00% |  |
Term Life Insurance Segment [Member] |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Future policy benefits remeasurement gain (loss) | $ 23,000 | $ 28,000 |  |  |  |
Future policy benefits, changes in cash flow assumptions | 18,000 | 28,000 | $ 18,000 | $ 28,000 |  |
Future policy benefits, realized experience variances | 5,000 |  | $ 5,000 |  |  |
Term Life Insurance Segment [Member] | Maximum [Member] |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Future policy benefits, realized experience variances |  | 1,000 |  | $ 1,000 |  |
Corporate and Other Distributed Products Segment [Member] |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Future policy benefits remeasurement gain (loss) | $ (1,000) | $ (5,000) |  |  |  |

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- Definition Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from cash flow assumption change for future cash flows. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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- Definition Amount of remeasurement gain (loss) on liability for future policy benefit from application of revised benefit ratio as of contract issue. Includes, but is not limited to, remeasurement gain (loss) for annuitization insurance benefit, death and other insurance benefits, and traditional and limited-payment contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480112/944-40-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480112/944-40-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480112/944-40-45-4 + Details
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