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