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Basis of Presentation and Accounting Policies Discontinued Operations (Details) - Subsequent Event [Member] - Illinois Corn Processing LLC [Member] - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Jul. 03, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax   $ 11.6    
Noncontrolling Interest, Ownership Percentage by Parent       70.00%
Proceeds from Divestiture of Businesses   21.0    
Proceeds from Issuance of Secured Debt   $ 32.7    
London Interbank Offered Rate (LIBOR) [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 8.00% 5.00% 10.00%