Short- Duration Insurance Contracts - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Property & Casualty
Net Amount at Risk by Product and Guarantee [Line Items]
Decrease in estimated reserves for claims occurring in prior years	$ (6,200,000)	$ 0	$ (6,200,000)	$ 0
Favorable (unfavorable) development of total reserves for claims occurring in prior years	6,200,000	0	6,200,000	0
Group Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Decrease in estimated reserves for claims occurring in prior years	$ (3,300,000)	$ (3,000,000.0)	(9,400,000)	(7,900,000)
Favorable (unfavorable) development of total reserves for claims occurring in prior years			$ 9,400,000	$ 7,900,000