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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Operating lease obligations: |  |  |
Lease and rental expense included in costs and expenses | $ 25.6 | $ 26.2 |
Litigation matters [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Litigation accruals on an undiscounted basis | 4.5 |  | $ 4.5
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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