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Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
$ / bbl
Dec. 31, 2018
USD ($)
$ / gal
$ / bbl
Asset commodity derivatives - Crude oil [Member] | Liability commodity derivatives - Crude oil [Member] | Level 3 [Member] | Measurement Input, Commodity Forward Price [Member] | Minimum [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair value inputs, forward commodity price (in dollars per unit) | $ / bbl 61.05 37.59
Asset commodity derivatives - Crude oil [Member] | Liability commodity derivatives - Crude oil [Member] | Level 3 [Member] | Measurement Input, Commodity Forward Price [Member] | Maximum [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair value inputs, forward commodity price (in dollars per unit) | $ / bbl 62.14 51.99
Asset Commodity derivatives - Ethane [Member] | Liability Commodity Derivatives - Ethane [Member] | Level 3 [Member] | Measurement Input, Commodity Forward Price [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] | Measurement Input, Commodity Forward Price [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] | Measurement Input, Commodity Forward Price [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] | Measurement Input, Commodity Forward Price [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] | Measurement Input, Commodity Forward Price [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] | Measurement Input, Commodity Forward Price [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] | Measurement Input, Commodity Forward Price [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] | Measurement Input, Commodity Forward Price [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 $ 127.8 $ 161.9
Commodity liability derivatives 116.2 162.4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Commodity asset derivatives 0.1 1.3
Commodity liability derivatives 0.3 7.2
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Commodity asset derivatives 0.1 1.3
Commodity liability derivatives 0.3 7.2
Fair Value, Measurements, Recurring [Member] | Liability commodity derivatives - Crude oil [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Commodity liability derivatives 0.3 0.8
Fair Value, Measurements, Recurring [Member] | Liability Commodity Derivatives - Ethane [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [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] | Valuation Technique, Discounted Cash Flow [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] | Valuation Technique, Discounted Cash Flow [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] | Valuation Technique, Discounted Cash Flow [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] | Valuation Technique, Discounted Cash Flow [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Commodity asset derivatives $ 0.1 0.9
Fair Value, Measurements, Recurring [Member] | Asset Commodity derivatives - Ethane [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [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] | Valuation Technique, Discounted Cash Flow [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] | Valuation Technique, Discounted Cash Flow [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] | Valuation Technique, Discounted Cash Flow [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Commodity asset derivatives   $ 0.0