Short- Duration Insurance Contracts - Narrative (Details) - USD ($)	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Property & Casualty
Net Amount at Risk by Product and Guarantee [Line Items]
Favorable (unfavorable) development of total reserves for claims occurring in prior years	$ 0	$ 0
Group Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Favorable (unfavorable) development of total reserves for claims occurring in prior years	$ 6,100,000	$ 4,900,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479808/944-20-55-15

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Balance Type:	na
Period Type:	duration