OREANDA-NEWS. A.M. Best has revised the outlooks to negative from stable and affirmed the financial strength rating (FSR) of A+ (Superior) and the issuer credit ratings (ICR) of “aa-” of the insurance entities within the Mercury Casualty Group (Mercury). Additionally, A.M. Best has affirmed the FSR of A- (Excellent) and the ICRs of “a-” of the insurance entities within the American Mercury Insurance Group (AMI). The outlook for each AMI rating is stable.