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Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details) - Level 3 [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / bbl $ / gal | Dec. 31, 2014 USD ($) $ / bbl $ / MMBTU
Asset commodity derivatives - Crude oil [Member] | Liability commodity derivatives - Crude oil [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] | Minimum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / bbl | 35.63 | 49.26
Asset commodity derivatives - Crude oil [Member] | Liability commodity derivatives - Crude oil [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / bbl | 43.84 | 53.27
Asset commodity derivatives - Propane [Member] | Liability commodity derivatives - Propane [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] | Minimum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / gal | 0.42 |
Asset commodity derivatives - Propane [Member] | Liability commodity derivatives - Propane [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / gal | 0.44 |
Assets commodity derivatives - Natural gas [Member] | Liability commodity derivatives - Natural gas [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair Value Measurements, Valuation Techniques | Discounted cash flow |
Input description | Forward commodity prices |
Assets commodity derivatives - Natural gas [Member] | Liability commodity derivatives - Natural gas [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / MMBTU |  | 3.05
Assets commodity derivatives - Natural gas [Member] | Liability commodity derivatives - Natural gas [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / MMBTU |  | 4.09
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Financial assets | $ 0.9 | $ 1.0
Financial liabilities | 2.5 | 0.6
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Crude oil [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Financial liabilities | 1.2 | 0.4
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Natural gas [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Financial liabilities |  | 0.2
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Propane [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Financial liabilities | 1.3 |
Fair Value, Measurements, Recurring [Member] | Asset commodity derivatives - Crude oil [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Financial assets | 0.9 | 1.0
Fair Value, Measurements, Recurring [Member] | Asset commodity derivatives - Propane [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Financial assets | $ 0.0 |
Fair Value, Measurements, Recurring [Member] | Assets commodity derivatives - Natural gas [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Financial assets |  | $ 0.0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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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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