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Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details) - Fair Value [Member] $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) $ / gal $ / bbl | Dec. 31, 2014 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 | 44.47 |
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 | 50.74 |
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] | Maximum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / gal | 0.50 |
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] | Minimum [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] | Maximum [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Fair value inputs, forward commodity price (in dollars per unit) | $ / gal | 1.00 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | $ 242.8 | $ 226.6
Commodity liability derivatives | 197.1 | 147.4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | 1.0 | 1.0
Commodity liability derivatives | 17.0 | $ 0.6
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 | 1.3 |
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Propane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity liability derivatives | 0.1 |
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 | 15.6 |
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 | 0.7 |
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 | $ 0.3 |

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