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Business Acquired	12 Months Ended
Business Acquired	Dec. 31, 2019
Business Combinations [Abstract]
Business Acquired	Business Acquired Barbican Group Holdings Limited On November 29, 2019, the Company closed the acquisition of Barbican Group Holdings Limited and its subsidiaries (“Barbican”), including Barbican Managing Agency Limited (“BMAL”), Lloyd’s Syndicate 1955 (“Barbican Syndicate 1955”), Castel Underwriting Agencies Limited (“Castel”) and other associated entities. The Ardonagh Group On January 1, 2019, the Company’s U.K. insurance operations entered into a transaction with The Ardonagh Group to acquire renewal rights for a U.K. commercial lines book of business, consisting of commercial property, casualty, motor, professional liability, personal accident and travel business. McNeil On December 6, 2018, the Company closed the acquisition of McNeil & Co. (“McNeil”), a nationwide leader in specialized risk management and insurance programs headquartered in Cortland, New York. Arch MI Asia Limited On July 1, 2017, the Company closed the acquisition of AIG United Guaranty Insurance (Asia) Limited (renamed “Arch MI Asia Limited”) following the payment of $40.0 million to American International Group, Inc. (“AIG”). Arch MI Asia Limited compliments the Company’s existing private mortgage insurance businesses, which have operations in the United States, Europe and Australia.