Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($) $ / bbl	Dec. 31, 2017 USD ($)
Asset commodity derivatives - Crude oil [Member] \| Liability commodity derivatives - Crude oil [Member] \| Level 3 [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Techniques	Discounted cash flow
Input description	Forward commodity prices
Asset commodity derivatives - Crude oil [Member] \| Liability commodity derivatives - Crude oil [Member] \| Level 3 [Member] \| Minimum [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Fair value inputs, forward commodity price (in dollars per unit) \| $ / bbl	65.01
Asset commodity derivatives - Crude oil [Member] \| Liability commodity derivatives - Crude oil [Member] \| Level 3 [Member] \| Maximum [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Fair value inputs, forward commodity price (in dollars per unit) \| $ / bbl	76.84
Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Commodity asset derivatives	$ 191.6	$ 161.7
Commodity liability derivatives	459.4	176.9
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Commodity asset derivatives	4.8	2.9
Commodity liability derivatives	3.5	$ 1.7
Fair Value, Measurements, Recurring [Member] \| Liability commodity derivatives - Crude oil [Member] \| Level 3 [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Commodity liability derivatives	3.5
Fair Value, Measurements, Recurring [Member] \| Asset commodity derivatives - Crude oil [Member] \| Level 3 [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Commodity asset derivatives	$ 4.8

The forward commodity price (in dollars per unit of measure), used as an input to measure fair value.

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- Definition

The input used for the valuation of unobservable input.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Fair value as of the balance sheet date of price risk derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets on the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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- Definition

Fair value as of the balance sheet date of price risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities on the balance sheet.

+ References

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