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Commitments and Contingencies, Contractual Obligations (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Scheduled maturities of debt obligations [Abstract]    
2013 $ 1,546.6  
2014 1,150.0  
2015 1,300.0  
2016 750.0  
2017 800.0  
Thereafter 10,632.7  
Total 16,179.3 14,482.7
Estimated cash interest payments [Abstract]    
2013 840.4  
2014 765.2  
2015 706.2  
2016 682.3  
2017 668.1  
Thereafter 13,410.5  
Total 17,072.7  
Operating lease obligations [Abstract]    
2013 51.3  
2014 44.1  
2015 42.8  
2016 37.5  
2017 33.3  
Thereafter 154.0  
Total 363.0  
Natural Gas [Member]
    
Estimated payment obligations:    
2013 911.8  
2014 733.4  
2015 667.2  
2016 614.2  
2017 338.7  
Thereafter 761.9  
Total 4,027.2  
Underlying major volume commitments:    
2013 321,000,000,000,000  
2014 260,000,000,000,000  
2015 237,000,000,000,000  
2016 220,000,000,000,000  
2017 128,000,000,000,000  
Thereafter 276,000,000,000,000  
Total 1,442,000,000,000,000  
NGLs [Member]
    
Estimated payment obligations:    
2013 1,136.3  
2014 447.1  
2015 121.4  
2016 0  
2017 0  
Thereafter 0  
Total 1,704.8  
Underlying major volume commitments:    
2013 27  
2014 13  
2015 4  
2016 0  
2017 0  
Thereafter 0  
Total 44  
Crude Oil [Member]
    
Estimated payment obligations:    
2013 386.1  
2014 0  
2015 0  
2016 0  
2017 0  
Thereafter 0  
Total 386.1  
Underlying major volume commitments:    
2013 5  
2014 0  
2015 0  
2016 0  
2017 0  
Thereafter 0  
Total 5  
Petrochemicals And Refined Products [Member]
    
Estimated payment obligations:    
2013 1,519.7  
2014 366.0  
2015 119.1  
2016 117.0  
2017 0  
Thereafter 0  
Total 2,121.8  
Underlying major volume commitments:    
2013 20  
2014 5  
2015 2  
2016 2  
2017 0  
Thereafter 0  
Total 29  
Estimated Payment Obligations Other [Member]
    
Estimated payment obligations:    
2013 83.9  
2014 7.6  
2015 7.2  
2016 6.9  
2017 6.3  
Thereafter 15.8  
Total 127.7  
Service Payment Commitments [Member]
    
Estimated payment obligations:    
2013 114.5  
2014 97.2  
2015 98.7  
2016 91.9  
2017 86.1  
Thereafter 257.1  
Total 745.5  
Capital Expenditure Commitments [Member]
    
Estimated payment obligations:    
2013 1,754.0  
2014 0  
2015 0  
2016 0  
2017 0  
Thereafter 0  
Total $ 1,754.0