SAO PAULO--(BUSINESS WIRE)--Fitch Ratings has affirmed Cosan S.A Industria e Comercio's (Cosan) foreign and local currency Issue Default Ratings (IDRs) at 'BB+', and the company's Long-term National Scale Rating at 'AA(bra)'. Fitch has also affirmed Cosan Luxembourg S.A's senior unsecured notes due 2018 and 2023 and Cosan Overseas Limited's perpetual bond at 'BB+'. Cosan Luxembourg S.A and Cosan Overseas Limited are fully-owned subsidiaries of Cosan and the issuances are unconditionally and irr