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Commitments And Contingencies (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) property	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) property	Jun. 30, 2017 USD ($)
Trading Activity, Gains and Losses, Net [Line Items]
Lease expenses	$ 10.0	$ 11.9	$ 20.7	$ 22.2
Contracted future purchases	$ 481.3		$ 481.3
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		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Previously accrued contingent liabilities that no longer represent probable losses	$ 6.3		$ 6.3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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