Hanover Insurance Group, Inc. (The) operates in the Fire, marine, and casualty insurance sector. The Hanover Insurance Group, Inc. (THG) is a holding company. Its business operations include insurance products and services in three property and casualty operating segments. These segments are Commercial Lines, Personal Lines, and Other Property and Casualty. Its Property and Casualty group manages its operations through three segments: Commercial Lines, Personal Lines and Other Property and Casualty. Its Other Property and Casualty segment consists of Opus Investment Management, Inc. (Opus), which markets investment management services to institutions, pension funds and other organizations. In Commercial Lines, it is segmenting its business into industry groups and coverage, which require underwriting and claims expertise and specialized coverage forms. In Personal Lines, it is focusing on account business. In January 2010, it acquired Benchmark Professional Insurance Services, Inc. (Benchmark). In March 2010, it acquired Campania Holding Company, Inc. In our complete report available for purchase the company is compared to: Mercury General Corporation, Arch Capital Group Ltd. and Unitrin, Inc..