CHICAGO–(BUSINESS WIRE)–Fitch Ratings has affirmed Marsh & McLennan Companies, Inc.’s (MMC) Long-Term Issuer Default Rating (IDR) and existing senior unsecured debt ratings at ‘A-‘ and short-term ratings at ‘F2’. The Rating Outlook is Stable. A full list of ratings follows at the end of this release. KEY RATING DRIVERS The ratings affirmation reflects MMC’s continued strong balance sheet, financial flexibility and excellent operating performance. Fitch expects that MMC’s key credit ratios