Derivatives (Details Textuals) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Derivatives (Textuals) [Abstract]
Maximum period in which contracts for the sale of grain to processors or other consumers extend	1 year
Estimated fair value of inventory	$ 89.3	$ 27.3	$ 1.6