{"cik":947484,"taxonomy":"us-gaap","tag":"CommonStockDividendsPerShareDeclared","label":"Common Stock, Dividends, Per Share, Declared","description":"Aggregate dividends declared during the period for each share of common stock outstanding.","entityName":"Arch Capital Group Ltd.","units":{"USD/shares":[{"start":"2024-01-01","end":"2024-12-31","val":5,"accn":"0000947484-25-000017","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-27","frame":"CY2024"},{"start":"2025-01-01","end":"2025-12-31","val":5,"accn":"0000947484-26-000017","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-26","frame":"CY2025"}]}}