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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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Contractual interest rate for funds borrowed, under the debt agreement.

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