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Commitments and Contingencies (Details) bbl in Millions, $ in Millions, BTU in Trillions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) BTU bbl | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Redelivery commitments: |  |  |  |
Redelivery commitments of natural gas | BTU | 9.0 |  |  |
Redelivery commitments of crude oil | bbl | 15.8 |  |  |
Redelivery commitments of NGL and petrochemical products | bbl | 39.3 |  |  |
Operating lease obligations: |  |  |  |
Lease and rental expense included in costs and expenses | $ 103.6 | $ 110.1 | $ 104.3 |
Liabilities, Other than Long-term Debt, Noncurrent [Abstract] |  |  |  |
Noncurrent portion of AROs | 81.1 | 76.5 |  |
Deferred revenues - non-current portion | 135.5 | 137.0 |  |
Liquidity option agreement | 333.9 | 269.6 |  |
Derivative liabilities | 10.4 | 2.8 |  |
Centennial guarantees | 4.5 | 5.3 |  |
Other | 13.0 | 12.7 |  |
Total | 578.4 | 503.9 |  |
Junior Subordinated Note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt obligations | 3,170.0 |  |  |
Centennial Pipeline LLC [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt obligations | $ 50.0 |  |  |
Minimum [Member] |  |  |  |
Operating lease obligations: |  |  |  |
Term of material lease agreements | 5 years |  |  |
Maximum [Member] |  |  |  |
Operating lease obligations: |  |  |  |
Term of material lease agreements | 30 years |  |  |
Renewal option years for certain leases | 20 years |  |  |
Litigation matters [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation accruals on an undiscounted basis | $ 4.5 | $ 0.3 |  |
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 | $ 25.0 |  |  |
Fair value of debt guarantee | 3.7 |  |  |
Centennial cash call guarantee [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash call guarantee | 50.0 |  |  |
Fair value of cash call guarantee | $ 1.6 |  |  |

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