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Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / bbl $ / gal | Dec. 31, 2017 USD ($) $ / bbl
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 | 37.59 | 60.21
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 | 51.99 | 66.05
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 | 0.28 |
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 | 0.31 |
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 | 0.61 |
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 | 0.66 |
Asset commodity derivatives - Normal butane [Member] | Liability commodity derivatives - Normal butane [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 | 0.66 |
Asset commodity derivatives - Normal butane [Member] | Liability commodity derivatives - Normal butane [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 | 0.72 |
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 | 0.99 |
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 | 1.01 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | $ 161.9 | $ 161.7
Commodity liability derivatives | 162.4 | 176.9
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | 1.3 | 2.9
Commodity liability derivatives | 7.2 | 1.7
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 | 0.8 | 1.7
Fair Value, Measurements, Recurring [Member] | Liability Commodity Derivatives - Ethane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity liability derivatives | 0.6 |
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Normal butane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity liability derivatives | 0.7 |
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 | 4.1 |
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Propane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity liability derivatives | 1.0 |
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 | 0.9 | $ 2.9
Fair Value, Measurements, Recurring [Member] | Asset Commodity derivatives - Ethane [Member] | Level 3 [Member] |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |
Commodity asset derivatives | 0.4 |
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 - Normal butane [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 | $ 0.0 |

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- Definition Fair value as of the balance sheet date of price risk derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets on the balance sheet. + References No definition available. + Details
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