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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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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 |

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the cash call agreement for certain unconsolidated affiliates. The cash call agreement has been entered into in lieu of insurance. + References No definition available. + Details
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- Definition Barrels of crude oil to be redelivered to their owners under various agreements. + References No definition available. + Details
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- Definition Natural gas to be redelivered to their owners under various agreements. + References No definition available. + Details
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- Definition As part of our normal business activities we occasionally have claims made against us as a result of disputes related to contractual agreements or other communications. These matters are in various stages of assessment and the ultimate outcome of such disputes cannot be reasonably estimated at this time. However, in our opinion, the likelihood of a material adverse outcome to us resulting from such disputes is remote. + References No definition available. + Details
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