 OLDWICK, N.J.--BUSINESS WIRE--AM Best has affirmed the Financial Strength Rating FSR of A Excellent and the Long-Term Issuer Credit Ratings Long-Term ICR of a Excellent of the propertycasualty subsidiaries of The Hanover Insurance Group, Inc. THG NYSE: THG, which are collectively referred to as The Hanover or the group. Additionally, AM Best has affirmed the Long-Term ICR of bbb Good and all Long-Term Issue Credit Ratings Long-Term IR of THG, which is the parent holding 