Acquisitions and Dispositions	6 Months Ended
Jun. 30, 2024
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Dispositions	8. ACQUISITONS AND DISPOSTIONS On September 30, 2022, RLI Corp. completed the sale of its equity method investment in Maui Jim, Inc. to Kering Eyewear. During the first quarter of 2023, the payout of the working capital escrow resulted in the recognition of a $14 million gain that was recorded in the net realized gain line item of the statement of earnings.

The entire disclosure for business combinations, including leverage buyout transactions (as applicable), and divestitures. This may include a description of a business combination or divestiture (or series of individually immaterial business combinations or divestitures) completed during the period, including background, timing, and assets and liabilities recognized and reclassified or sold. This element does not include fixed asset sales and plant closings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 805
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/805/tableOfContent

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/205-20/tableOfContent

Name:	us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration