NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded its long-term Issuer Default Rating (IDR) on Best Buy Co., Inc. (Best Buy) to 'BBB-' from 'BB'. The Rating Outlook is Stable. A full list of rating actions follows at the end of this release. KEY RATING DRIVERS The upgrade reflects Fitch's expectation that management's successful focus on higher margined products and services, coupled with expense reductions, will allow annualized EBITDA to remain at or above $2 billion. At this level, lever