XL Group Ltd, through its subsidiaries, operates as an insurance and reinsurance company worldwide. The company’s Insurance segment offers primary and excess casualty, environmental liability, professional liability, property, excess and surplus lines, U.S. program/facilities, and construction business products.It also provides property and casualty products,construction-related products and risk engineering services.In June 2007, the company opened an office in Houston, Texas to focus on the energy sector.