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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 FIN 48 [Member] | Sep. 30, 2013 FIN 48 reserve, net of tax [Member] | Sep. 30, 2013 Federal operating loss [Member]
Income Tax Reconciliation, Tax Contingencies, State and Local |  | $ 7.8 | $ 5.1 |
Reduction in income tax expense related to the Midstream Partnership | 3.9 |  |  |
Increase in income tax expense related to deconsolidation | 3.9 |  |  |
Net Operating Loss Carryforwards Utilized |  |  |  | 122.0
Deferred Income Tax Expense (Benefit) | $ 17.1 |  |  |

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