Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended
Jun. 30, 2013	Jun. 30, 2013 FIN 48 [Member]	Jun. 30, 2013 FIN 48 reserve, net of tax [Member]	Jun. 30, 2013 Federal operating loss [Member]	Jun. 30, 2013 State 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				227.0	42.0
Net Operating Loss Carryforwards Utilized, Net of Tax				$ 147.6	$ 39.6

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in state and local income tax contingency.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration