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Commitments and Contingencies Crude Oil Releases (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Haynesville Crude Oil Release [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental Remediation Expense |  | $ 1.0 | $ 0.2 | $ 1.0
Fouke Junction Crude Oil Release [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental Remediation Expense | $ 0.0 |  | 0.0 |
Accrual for Environmental Loss Contingencies | $ 1.6 |  | $ 1.6 |

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