Arch Capital Group Ltd. provides insurance, reinsurance and mortgage insurance. The Company provides a range of property, casualty and mortgage insurance and reinsurance lines. The Company operates in five segments: insurance, reinsurance, mortgage, other and corporate. The insurance segment's product lines include construction and national accounts; excess and surplus casualty; lenders products; professional lines; programs; property, energy, marine and aviation; travel, accident and health, and other. The reinsurance segment's product lines include casualty; marine and aviation; other specialty; property catastrophe; property excluding property catastrophe, and other. The mortgage segment includes the results of Arch Mortgage Insurance Company and Arch Mortgage Insurance Designated Activity Company, which are providers of mortgage insurance products and services to the United States and European markets. The other segment includes the results of Watford Holdings Ltd.