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v3.25.3

Investments - Held-to-maturity Security - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Investment, Type [Extensible Enumeration] | Deposit Asset Underlying10 Insurance Agreement [Member] | Deposit Asset Underlying10 Insurance Agreement [Member] | Deposit Asset Underlying10 Insurance Agreement [Member]
Held-to-maturity debt security estimated unrealized holding loss | $ (23,600,000) |  |
Held-to-maturity debt security Credit losses | $ 0 | $ 0 |
LLC Note [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Debt instrument, maturity date | Dec. 31, 2030 |  |
Debt instrument, interest rate, stated percentage | 4.50% |  |
Surplus Note [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Debt instrument, maturity date | Dec. 31, 2030 |  |
Debt instrument, interest rate, stated percentage | 4.50% |  |

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