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Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details) - Fair Value [Member] $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) $ / bbl $ / gal | Dec. 31, 2015 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 | 36.30 |
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 | 43.03 |
Asset commodity derivatives - Propane [Member] | Liability commodity derivatives - Propane [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 - Propane [Member] | Liability commodity derivatives - Propane [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 | 0.91 |
Asset commodity derivatives - Propane [Member] | Liability commodity derivatives - Propane [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 | 0.93 |
Asset commodity derivatives - Natural gasoline [Member] | Liability commodity derivatives - Natural gasoline [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 - Natural gasoline [Member] | Liability commodity derivatives - Natural gasoline [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 | 0.48 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | $ 231.0 | $ 255.6
Commodity liability derivatives | 289.2 | 143.0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | 2.3 | 0.9
Commodity liability derivatives | 1.7 | $ 2.5
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 | 1.4 |
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Propane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity liability derivatives | 0.3 |
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Natural gasoline [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity liability derivatives | 0.0 |
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 | 1.6 |
Fair Value, Measurements, Recurring [Member] | Asset commodity derivatives - Propane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | 0.0 |
Fair Value, Measurements, Recurring [Member] | Asset commodity derivatives - Natural gasoline [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | $ 0.7 |

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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=36462937&loc=d3e19207-110258 + Details
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