OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has downgraded the Financial Strength Rating to A+ (Superior) from A++ (Superior) and the Long-Term Issuer Credit Rating to “aa-” from “aa+” of Tokio Millennium Re AG (TMR) (Switzerland). In addition, A.M. Best has placed these Credit Ratings (ratings) under review with developing implications. The rating actions follow the recent announcement that RenaissanceRe Holdings Ltd (RenRe) (Bermuda) has entered into a definitive agreement with Tokio Marine Hol