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Derivatives - Narrative (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($) institution | Mar. 31, 2016 USD ($)
Derivative Instruments and Hedging Activities Disclosure |  |
Number of counterparties to open derivative contracts | institution | 6 |
Commodity Derivatives |  |
Derivative Instruments and Hedging Activities Disclosure |  |
Gain on derivative contracts | $ 34.2 | $ 2.8
Cash payments (receipts), upon settlement of derivative contract | $ 0.6 | $ (25.5)

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- Definition Derivative Instruments and Hedging Activities Disclosure [Line Items] + References No definition available. + Details
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- Definition Number Of Counterparties To Open Derivative Contracts + References No definition available. + Details
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- Definition The amount of cash received during the period on settlement of a hedge. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Details
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