NEW YORK (Standard&Poor's) Sept. 26, 2011--Standard&Poor's Ratings Services said today it is assigning its 'A' rating to Archer Daniels Midland Co.'s (ADM) newly extended $527.7 million senior unsecured debentures due 2042. The face value of the debentures reflects the sum total of tendered extensions (including any premiums) of various principal amounts outstanding under a series of existing ADM debentures, following the expiration of the early participation date of the exchange offer on Sept. 23, 2011. The current outstanding balance of the newly rated 2042 debentures may increase, contingent upon any additional tendered amounts until the final expiration of the exchange offer on Oct. 5, 2011. The ratings on Decatur, Ill.-based ADM reflect a strong business risk