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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Btu
MMBbls
Dec. 31, 2011
Dec. 31, 2010
Redelivery commitments [Abstract]      
Redelivery commitments of natural gas (in Btus) 11,200,000,000,000    
Redelivery commitments of crude oil (in MMBbls) 9.5    
Redelivery commitments of NGL and petrochemical products (in MMBbls) 32.3    
Operating lease obligations [Abstract]      
Minimum term of material lease agreements (in years) 14    
Maximum term of material lease agreements (in years) 20    
Renewal option years for certain leases (in years) 20    
Lease and rental expense included in costs and expenses $ 95.1 $ 86.2 $ 72.9
Other claims [Abstract]      
Claims against various parties related to contractual agreements 45.9    
Claims against us related to contractual agreements 43.1    
Centennial debt guarantee [Member]
     
Guarantor Obligations [Line Items]      
Percentage of debt obligations guaranteed (in hundredths) 50.00%    
Guarantee of debt obligations 46.5    
Fair value of debt guarantee 6.6    
Cash call guarantee 50    
Fair value of cash call guarantee 2.9    
Centennial Pipeline LLC [Member]
     
Debt Instrument [Line Items]      
Debt obligations 93    
Litigation matters [Member]
     
Loss Contingencies [Line Items]      
Litigation accruals on an undiscounted basis $ 4.4 $ 16.5