RIO DE JANEIRO--(BUSINESS WIRE)--Fitch Ratings has affirmed Caixa Economica Federal's (Caixa) Issuer Default Ratings (IDRs), National Ratings, Support Rating (SR) and Support Rating Floor (SRF). The Rating Outlook is Negative. A full list of rating actions is at the end of this rating action commentary. KEY RATING DRIVERS IDRS, NATIONAL RATINGS AND SENIOR DEBT Caixa's IDRs, National and senior debt ratings are driven by sovereign support and equal to Brazil's sovereign ratings. The Negative Out