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Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) $ / bbl $ / gal | Dec. 31, 2016 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 | 44.84 |
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 | 47.60 |
Asset Commodity derivatives - Ethane [Member] | Liability Commodity Derivatives - Ethane [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 - Ethane [Member] | Liability Commodity Derivatives - Ethane [Member] | Level 3 [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / gal | 0.26 |
Asset Commodity derivatives - Ethane [Member] | Liability Commodity Derivatives - Ethane [Member] | Level 3 [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / gal | 0.32 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | $ 40.9 | $ 541.4
Commodity liability derivatives | 48.9 | 739.4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | 0.5 | 1.7
Commodity liability derivatives | 0.3 | $ 0.3
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 | 0.2 |
Fair Value, Measurements, Recurring [Member] | Liability Commodity Derivatives - Ethane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity liability derivatives | 0.1 |
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 | 0.3 |
Fair Value, Measurements, Recurring [Member] | Asset Commodity derivatives - Ethane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | $ 0.2 |

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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 + Details
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