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Derivatives - Narrative (Details) $ in Millions	3 Months Ended
	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]

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- Definition

Number Of Counterparties To Open Derivative Contracts

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- Definition

The amount of cash received during the period on settlement of a hedge.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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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

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