Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details) - Level 3 [Member] $ in Millions	12 Months Ended
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

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.

+ Details

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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=36462937&loc=d3e19207-110258

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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