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Commitments and Contingencies (Details)
bbl in Millions, $ in Millions, BTU in Trillions
12 Months Ended
Dec. 31, 2015
USD ($)
BTU
bbl
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Redelivery commitments [Abstract]      
Redelivery commitments of natural gas (in TBtus) | BTU 10.2    
Redelivery commitments of crude oil (in MMBbls) | bbl 18.7    
Redelivery commitments of NGL and petrochemical products (in MMBbls) | bbl 37.5    
Operating lease obligations [Abstract]      
Minimum term of material lease agreements (in years) 5 years    
Maximum term of material lease agreements (in years) 30 years    
Renewal option years for certain leases (in years) 20 years    
Lease and rental expense included in costs and expenses $ 104.3 $ 94.2 $ 87.6
Liabilities, Other than Long-term Debt, Noncurrent [Abstract]      
Noncurrent portion of AROs 52.9 83.2  
Deferred revenues - non-current portion 78.3 73.0  
Liquidity Option Agreement 245.1 219.7  
Centennial guarantees 6.1 7.0  
Other 29.1 28.2  
Total 411.5 411.1  
Junior Subordinated Note [Member]      
Debt Instrument [Line Items]      
Debt obligations 1,470.0    
Centennial Pipeline LLC [Member]      
Debt Instrument [Line Items]      
Debt obligations 67.2    
Litigation matters [Member]      
Loss Contingencies [Line Items]      
Litigation accruals on an undiscounted basis 4.6 $ 2.4  
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 (in hundredths) 5.00%    
Centennial debt guarantee [Member]      
Guarantor Obligations [Line Items]      
Percentage of debt obligations guaranteed (in hundredths) 50.00%    
Guarantee of debt obligations $ 33.6    
Fair value of debt guarantee 4.9    
Centennial cash call guarantee [Member]      
Guarantor Obligations [Line Items]      
Cash call guarantee 50.0    
Fair value of cash call guarantee $ 2.1