LONDON–(BUSINESS WIRE)–AM Best has upgraded the Long-Term Issuer Credit Rating (Long–Term ICR) to “a+” from “a” and affirmed the Financial Strength Rating (FSR) of A (Excellent) of Assicurazioni Generali S.p.A. (Generali) (Italy) and its main rated subsidiaries. The outlook of the Long-Term ICR has been revised to stable from positive while the outlook of the FSR remains stable. AM Best also has upgraded the Long-Term Issue Credit Ratings (Long-Term IRs) of debt instruments issued or guarante