Loss And Loss Adjustment Expense Reserves - Average Annual Percentage Payout of Incurred Claims by Age (Details)	Dec. 31, 2023
Property insurance product line, automobile
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration insurance contracts, historical claims duration, year one	59.10%
Short-duration insurance contracts, historical claims duration, year two	19.00%
Short-duration insurance contracts, historical claims duration, year three	9.40%
Short-duration insurance contracts, historical claims duration, year four	5.70%
Short-duration insurance contracts, historical claims duration, year five	3.10%
Short-duration insurance contracts, historical claims duration, year six	1.40%
Short-duration insurance contracts, historical claims duration, year seven	0.60%
Short-duration insurance contracts, historical claims duration, year eight	0.30%
Short-duration insurance contracts, historical claims duration, year nine	0.10%
Short-duration insurance contracts, historical claims duration, year ten	0.10%
Property insurance product line, homeowners'
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration insurance contracts, historical claims duration, year one	66.80%
Short-duration insurance contracts, historical claims duration, year two	23.00%
Short-duration insurance contracts, historical claims duration, year three	4.10%
Short-duration insurance contracts, historical claims duration, year four	2.40%
Short-duration insurance contracts, historical claims duration, year five	1.50%
Short-duration insurance contracts, historical claims duration, year six	0.80%
Short-duration insurance contracts, historical claims duration, year seven	0.60%
Short-duration insurance contracts, historical claims duration, year eight	0.30%
Short-duration insurance contracts, historical claims duration, year nine	0.40%
Short-duration insurance contracts, historical claims duration, year ten	0.10%