Enstar Group Limited acquires and manages insurance and reinsurance companies in run-off and portfolios of insurance and reinsurance business in run-off. It operates in four segments: Non-Life Run-Off, Atrium, Torus, and Life and Annuities. The Non-Life Run-Off segment engages in the running off property and casualty, and other non-life lines of businesses. It also provides consulting services, including claims inspection, claims validation, and reinsurance asset collection, as well as IT consulting and other services to the insurance and reinsurance industry. The Atrium segment is involved in underwriting various classes, including accident and health, aviation, marine, property, liability, reinsurance, upstream energy, and war and terrorism. The Torus segment is involved in underwriting general property, marine, onshore and offshore energy, construction, power and utility, aviation, space, casualty, healthcare, and workers compensation risks, as well as professional liability and management liability. The life and Annuities segment manages the closed-block of life and annuity business. Enstar Group Limited operates in Bermuda, the United States, the United Kingdom, Continental Europe, Australia, and other international locations. The company was formerly known as Castlewood Holdings Limited and changed its name to Enstar Group Limited as a result of its merger with The Enstar Group, Inc. in January 2007. Enstar Group Limited was founded in 2001 and is headquartered in Hamilton, Bermuda.