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Commitments And Contingencies (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) property	Sep. 30, 2015 USD ($)
Trading Activity, Gains and Losses, Net [Line Items]
Lease expenses	$ 9.1	$ 8.0	$ 27.2	$ 24.8
Contracted future purchases	383.7		$ 383.7
Acquisition Of Fairmont, Minnesota and Wood River, Nebraska Ethanol Plants [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Number of ethanol plants | property			2
Previously accrued contingent liabilities that no longer represent probable losses	6.3		$ 6.3
Gain contingency	$ 5.5		$ 5.5

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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