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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Scheduled maturities of debt obligations [Abstract] |  |
Principal amount of consolidated debt obligations outstanding | $ 27,115.6 | $ 26,420.6
Litigation matters [Member] |  |
Loss Contingencies [Line Items] |  |
Litigation accruals on an undiscounted basis | 0.5 | $ 0.5
Litigation matters [Member] | ETP Lawsuit [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency, damages awarded | 319.4 |
Loss contingency, total damages sought | 535.8 |
Loss contingency, disgorgement damages sought | 150.0 |
Prejudgment interest | $ 66.4 |
Post-judgment interest rate | 5.00% |
Positive Outcome of Litigation [Member] |  |
Gain Contingencies [Line Items] |  |
Counterclaim settlement awarded | $ 0.8 |

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