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Income Taxes - Components of Consolidated Income Tax Provision (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax provision (benefit) -
U.S. Federal	$ 185.1us-gaap_CurrentFederalTaxExpenseBenefit	$ 129.6us-gaap_CurrentFederalTaxExpenseBenefit	$ 27.1us-gaap_CurrentFederalTaxExpenseBenefit
State and local	33.1us-gaap_CurrentStateAndLocalTaxExpenseBenefit	12.7us-gaap_CurrentStateAndLocalTaxExpenseBenefit	6.4us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	0.9us-gaap_CurrentForeignTaxExpenseBenefit	0.3us-gaap_CurrentForeignTaxExpenseBenefit	0us-gaap_CurrentForeignTaxExpenseBenefit
Total current provision for taxes	219.1us-gaap_CurrentIncomeTaxExpenseBenefit	142.6us-gaap_CurrentIncomeTaxExpenseBenefit	33.5us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred -
U.S. Federal	(5.0)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(160.5)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	179.1us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local	7.6us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	0.3us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	1.9us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	0us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(0.1)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred provision (benefit) for taxes	2.6us-gaap_DeferredIncomeTaxExpenseBenefit	(160.3)us-gaap_DeferredIncomeTaxExpenseBenefit	181.0us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision (benefit) for taxes	$ 221.7us-gaap_IncomeTaxExpenseBenefit	$ (17.7)us-gaap_IncomeTaxExpenseBenefit	$ 214.5us-gaap_IncomeTaxExpenseBenefit

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

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