Short- Duration Insurance Contracts - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Property & Casualty
Net Amount at Risk by Product and Guarantee [Line Items]
Increase (decrease) in estimated reserves for claims occurring in prior periods	$ (5,300,000)	$ 0
Favorable (unfavorable) development of total reserves for claims occurring in prior years	5,300,000	0
Group Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Increase (decrease) in estimated reserves for claims occurring in prior periods	400,000	$ (6,100,000)
Favorable (unfavorable) development of total reserves for claims occurring in prior years	$ (400,000)