A.M. Best Co. reiterated the issuer credit ratings (ICR) of “bbb-” and all existing debt ratings of  Montpelier Re Holdings Ltd. (NYSE:MRH). The rating agency upgraded the outlook to positive from stable. Subsequently, A.M. Best also affirmed the financial strength rating (FSR) of A- (Excellent) and ICR of “a-” of Montpelier Reinsurance Ltd. and its [...]