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Related Party Transactions (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Director
Jun. 30, 2012
Dec. 31, 2012
Related Party Transaction [Line Items]          
Total distributions received from unconsolidated affiliates $ 5.1   $ 13.4    
Percentage of shares acquired from subsidiary (percentage) 100.00%   100.00%    
Voting interest in IANR (percentage)     49.90%    
Voting interest held by the common shareholders (percentage)     50.10%    
Rate of dividends accrued annually (percentage)     14.00%    
Estimated fair value of the Company's investment in IANR 17.7   17.7    
Number of board of directors (directors)     5    
Directors from the Company (directors)     2    
Directors from common shareholders (directors)     2    
Independent director (directors)     1    
Number of board of directors required to take key decision (directors)     4    
Current maximum exposure to loss related to IANR 22.4   22.4    
Investment and unpaid accrued dividends 4.7   4.7    
Revenues recognized for the sale of ethanol 162.8 151.9 308.6 294.9  
Revenues recognized for the sale of corn 200.2 165.3 405.1 344.4  
Related party, Gross asset 8.6 1.1 8.6 1.1 3.2
Related party, Gross liability $ 0.6 $ 1.8 $ 0.6 $ 1.8 $ 0.3
The Andersons Ethanol Investment LLC
         
Related Party Transaction [Line Items]          
Percentage of company ownership interest (percentage) 66.00%   66.00%    
Noncontrolling interest is attributed of all gains and losses of parent (percentage) 34.00%   34.00%    
The Andersons Marathon Ethanol LLC
         
Related Party Transaction [Line Items]          
Percentage of company ownership interest (percentage) 50.00%   50.00%