 OLDWICK, N.J.--BUSINESS WIRE-- insurance--AM Best has affirmed the Financial Strength Rating FSR of A Superior and the Long-Term Issuer Credit Ratings Long-Term ICR of aa- Superior of Renaissance Reinsurance Ltd. RenaissanceRe, Renaissance Reinsurance U.S. Inc. Maryland, RenaissanceRe Specialty U.S. Ltd., Renaissance Reinsurance of Europe Unlimited Company Dublin, Ireland and RenaissanceRe Europe AG Zurich, Switzerland formally named Tokio Millennium Re AG. Additionally, AM Best has 