The Hanover Insurance Group, Inc., through its subsidiaries, provides various property and casualty insurance products and services in the United States. The company operates through four segments: Core Commercial, Specialty, Personal Lines, and Other. It offers commercial multiple peril, workers' compensation, commercial automobile, and other commercial lines coverage; and professional and executive lines, marine, and surety and other, as well as specialty property and casualty comprising Hanover program business, excess and surplus business, Hanover specialty industrial, and specialty general liability business coverage. The company also provides personal automobile; and homeowners and other personal lines, including residences and personal property, liability claims, personal umbrella, inland marine, fire, personal watercraft, personal cyber, and other miscellaneous coverages. It markets its products and services through independent agents and brokers. The company was formerly known as Allmerica Financial Corp. and changed its name to The Hanover Insurance Group, Inc. in December 2005. The Hanover Insurance Group, Inc. was founded in 1852 and is headquartered in Worcester, Massachusetts.