NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the ratings for Brown Brothers Harriman & Co. (BBH) at 'A+' with a Stable outlook. These rating actions were taken in conjunction with Fitch's U.S. trust and processing bank peer review. A full list of rating actions is at the end of this release. KEY RATING DRIVERS IDRS, NATIONAL RATINGS AND SENIOR DEBT Fitch Ratings has affirmed the Long- and Short-term Issuer Default Ratings (IDRs) for Brown Brothers Harriman & Co. (BBH) at 'A+' a