Losses, Claims and Settlement Expenses - General (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Supplementary Insurance Information, by Segment
Short-Duration Insurance Contract, Discounted Liability, Discount	$ 179,900,000	$ 184,700,000
Interest Accretion Amount	25,600,000	9,600,000	$ 42,000,000.0
General liability insurance face amount	10,000,000.0
Retention payable	500,000
Losses, claims, and settlement expenses, gross	130,600,000	121,300,000
Losses, claims, and settlement expenses	$ 87,500,000	$ 84,000,000.0
Average five year survival ratio, gross	6 years 7 months 6 days	6 years 4 months 24 days
Average five year survival ratio, net	7 years 4 months 24 days	7 years 7 months 6 days
5 Year average A&E reserves to ORGIG reserves	0.60%
Minimum [Member]
Supplementary Insurance Information, by Segment
Workers' compensation discount, percent	3.00%
General liability insurance face amount	$ 1,000,000.0
Maximum [Member]
Supplementary Insurance Information, by Segment
Workers' compensation discount, percent	3.50%
General liability insurance face amount	$ 2,000,000.0