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Derivative Instruments, Hedging Activities and Fair Value Measurements, Level 3 Recurring Valuation Techniques (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
$ / gal
$ / bbl
Dec. 31, 2018
USD ($)
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 59.44  
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 66.48  
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 0.62  
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 0.69  
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 1.18  
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 1.24  
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 0.23  
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 0.26  
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 0.71  
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 0.80  
Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Commodity asset derivatives $ 138.4 $ 161.9
Commodity liability derivatives 108.4 162.4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Commodity asset derivatives 3.9 1.3
Commodity liability derivatives 3.0 $ 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 3.9  
Commodity liability derivatives 3.0  
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 0.1  
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 0.8  
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 0.5  
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 1.3  
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 0.3  
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 3.2  
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 - 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  
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 0.7  
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