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Fair Value Disclosures (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Fair value of debt $ 676.5us-gaap_DebtInstrumentFairValue $ 775.7us-gaap_DebtInstrumentFairValue
Book Value Of Debt 672.8gpre_BookValueOfDebt 735.2gpre_BookValueOfDebt
Fair value of accounts receivable 138.1us-gaap_AccountsReceivableFairValueDisclosure 106.8us-gaap_AccountsReceivableFairValueDisclosure
Fair value of accounts payable $ 170.2us-gaap_AccountsPayableFairValueDisclosure $ 112.0us-gaap_AccountsPayableFairValueDisclosure