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Commitments and Contingencies (Details)
bbl in Millions, $ in Millions, BTU in Trillions
12 Months Ended
Dec. 31, 2016
USD ($)
BTU
bbl
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Redelivery commitments:      
Redelivery commitments of natural gas | BTU 10.3    
Redelivery commitments of crude oil | bbl 20.0    
Redelivery commitments of NGL and petrochemical products | bbl 45.9    
Operating lease obligations:      
Lease and rental expense included in costs and expenses $ 110.1 $ 104.3 $ 94.2
Liabilities, Other than Long-term Debt, Noncurrent [Abstract]      
Noncurrent portion of AROs 76.5 52.9  
Deferred revenues - non-current portion 137.0 87.8  
Liquidity option agreement 269.6 245.1  
Derivative liabilities 2.7 6.1  
Centennial guarantees 5.3 6.1  
Other 12.8 13.5  
Total 503.9 411.5  
Junior Subordinated Note [Member]      
Debt Instrument [Line Items]      
Debt obligations 1,470.0    
Centennial Pipeline LLC [Member]      
Debt Instrument [Line Items]      
Debt obligations $ 58.6    
Minimum [Member]      
Operating lease obligations:      
Term of material lease agreements 5 years    
Maximum [Member]      
Operating lease obligations:      
Term of material lease agreements 30 years    
Renewal option years for certain leases 20 years    
Litigation matters [Member]      
Loss Contingencies [Line Items]      
Litigation accruals on an undiscounted basis $ 0.3 $ 4.6  
Litigation matters [Member] | ETP Lawsuit [Member]      
Loss Contingencies [Line Items]      
Loss contingency, total damages sought     535.8
Loss contingency, damages awarded     319.4
Loss contingency, disgorgement damages sought     150.0
Prejudgment interest     $ 66.4
Post-judgment interest rate     5.00%
Centennial debt guarantee [Member]      
Guarantor Obligations [Line Items]      
Percentage of debt obligations guaranteed 50.00%    
Guarantee of debt obligations $ 29.3    
Fair value of debt guarantee 4.3    
Centennial cash call guarantee [Member]      
Guarantor Obligations [Line Items]      
Cash call guarantee 50.0    
Fair value of cash call guarantee $ 1.9