OLDWICK, N.J.--(BUSINESS WIRE)-- #insurance--AM Best has downgraded the Financial Strength Rating to A- (Excellent) from A (Excellent) and the Long-Term Issuer Credit Rating to "a-†(Excellent) from "a†(Excellent) of Nissan Global Reinsurance, Ltd. (NGRe) (Hamilton, Bermuda). The outlook of these Credit Ratings (ratings) is stable. The ratings reflect NGRe's balance sheet strength, which AM Best assesses as very strong, as well as its adequate operating performance, neutral business profile and appropriate. ...