Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal									$ 76.1us-gaap_CurrentFederalTaxExpenseBenefit	$ 265.8us-gaap_CurrentFederalTaxExpenseBenefit	$ 237.3us-gaap_CurrentFederalTaxExpenseBenefit
State									16.6	21.5	25.4
Total current									92.7us-gaap_CurrentIncomeTaxExpenseBenefit	287.3us-gaap_CurrentIncomeTaxExpenseBenefit	262.7us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal									8.3	(93.5)	(39.8)
State									(3.3)	(10.1)	2.7
Total deferred									5.0us-gaap_DeferredIncomeTaxExpenseBenefit	(103.6)us-gaap_DeferredIncomeTaxExpenseBenefit	(37.1)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense	$ (21.0)us-gaap_IncomeTaxExpenseBenefit	$ 4.2us-gaap_IncomeTaxExpenseBenefit	$ 45.2us-gaap_IncomeTaxExpenseBenefit	$ 69.4us-gaap_IncomeTaxExpenseBenefit	$ (39.1)us-gaap_IncomeTaxExpenseBenefit	$ 29.5us-gaap_IncomeTaxExpenseBenefit	$ 99.5us-gaap_IncomeTaxExpenseBenefit	$ 93.8us-gaap_IncomeTaxExpenseBenefit	$ 97.7us-gaap_IncomeTaxExpenseBenefit	$ 183.7us-gaap_IncomeTaxExpenseBenefit	$ 225.6us-gaap_IncomeTaxExpenseBenefit