Reinsurance and Indemnification - Kentucky Earthquake Excess of Loss Catastrophe Reinsurance Contracts (Narrative) (Details) - Kentucky Agreement $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($)
Reinsurance Retention Policy [Line Items]
Limit of aggregate losses under aggregate excess agreement	$ 28
Retention amount for catastrophe reinsurance agreement contracts	$ 2

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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479838/944-20-50-3

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