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Reinsurance - Narrative (Details) - USD ($) $ in Billions | Jun. 30, 2024 | Dec. 31, 2023
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Effects of Reinsurance [Line Items] |  |
Ceded reserves | $ 3.6 |
Reinsurance recoverables | $ 43.1 | $ 41.4
Investment Grade |  |
Effects of Reinsurance [Line Items] |  |
Reinsurance recoverable (as a percent) | 82.00% | 83.00%
Non-Investment Grade |  |
Effects of Reinsurance [Line Items] |  |
Reinsurance recoverable (as a percent) | 15.00% | 15.00%
Non-Investment Grade | Captive Insurers |  |
Effects of Reinsurance [Line Items] |  |
Reinsurance recoverable (as a percent) | 78.00% | 85.00%
Not Rated |  |
Effects of Reinsurance [Line Items] |  |
Reinsurance recoverable (as a percent) | 3.00% | 2.00%

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- Definition Liability for Future Policy Benefits, Losses, Claims and Loss Expense Reserves Ceded + References No definition available. + Details
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- Definition Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479616/944-310-45-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7A -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7A + Details
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