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Summary of Significant Accounting Policies (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]        
Maximum period in which contracts for the sale of grain to processors or other consumers extend   1 year    
Marketing balance payable   $ 2.2 $ 33.9  
Property subject to or available for leases statutory life minimum   40 years    
Property subject to or available for leases statutory life maximum   50 years    
Amortization of capitalized computer software costs   1.1 1.0 1.0
Unamortized computer software   42.8 24.6  
Capitalized interest on major projects 0.4 0.6    
Accounts payable for grain   83.2 113.1  
Accrued compensation liability   10.1 7.8  
Advertising expense   $ 3.9 $ 4.4 $ 4.0
Minimum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Intangible assets estimated useful life   5 years    
Maximum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Intangible assets estimated useful life   10 years    
Land Improvements
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   16 years    
Leasehold Improvements | Minimum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   3 years    
Leasehold Improvements | Maximum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   20 years    
Buildings and Storage Facilities | Minimum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   20 years    
Buildings and Storage Facilities | Maximum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   30 years    
Machinery and Equipment | Minimum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   3 years    
Machinery and Equipment | Maximum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   20 years    
Software | Minimum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   3 years    
Software | Maximum
       
Summary of Significant Accounting Policies (Textual) [Abstract]        
Asset estimated average useful life   10 years