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Commitments and Contingencies (Details)
bbl in Millions, $ in Millions, BTU in Trillions
12 Months Ended
Dec. 31, 2018
USD ($)
BTU
bbl
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Redelivery commitments:        
Redelivery commitments of natural gas | BTU 7.7      
Redelivery commitments of crude oil | bbl 18.4      
Redelivery commitments of NGL and petrochemical products | bbl 38.5      
Operating lease obligations:        
Renewal option years for certain leases 20 years      
Lease and rental expense included in costs and expenses $ 86.4 $ 103.6 $ 110.1  
Liabilities, Other than Long-term Debt, Noncurrent [Abstract]        
Noncurrent portion of AROs 121.4 81.1    
Deferred revenues - non-current portion 210.3 135.5    
Liquidity option agreement 390.0 333.9    
Derivative liabilities 14.2 10.4    
Centennial guarantees 3.6 4.5    
Other 12.1 13.0    
Total 751.6 578.4    
Junior Subordinated Note [Member]        
Debt Instrument [Line Items]        
Debt obligations 2,670.0      
Centennial Pipeline LLC [Member]        
Debt Instrument [Line Items]        
Debt obligations $ 41.8      
Minimum [Member]        
Operating lease obligations:        
Term of material lease agreements 5 years      
Maximum [Member]        
Operating lease obligations:        
Term of material lease agreements 30 years      
Litigation matters [Member]        
Loss Contingencies [Line Items]        
Litigation accruals on an undiscounted basis $ 0.5 $ 4.5    
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 $ 20.9      
Fair value of debt guarantee 3.1      
Centennial cash call guarantee [Member]        
Guarantor Obligations [Line Items]        
Cash call guarantee 50.0      
Fair value of cash call guarantee $ 1.3