NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the Issuer Default Rating (IDR) and senior unsecured rating for Buckeye Partners, L.P. (Buckeye) at 'BBB-'. The Rating Outlook remains Stable. KEY RATING DRIVERS Buckeye's 'BBB-' rating for the IDR and senior unsecured debt is based on the partnership's size, geographic diversity, and ability to invest in growth opportunities which should drive increases in EBITDA and distributable cash flows. Past acquisitions and strategic growth capex ini