Income Taxes Schedule of Compenents of Income Tax Expense (Benefit) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
United States			$ 239.8	$ 201.9	$ 178.6
Foreign			(2.2)	(1.7)	14.6
Income before income taxes and equity in earnings of investee companies	74.8	162.1	237.6	200.2	193.2
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal			85.1us-gaap_CurrentFederalTaxExpenseBenefit	71.8us-gaap_CurrentFederalTaxExpenseBenefit	32.5us-gaap_CurrentFederalTaxExpenseBenefit
State and Local			21.8	18.9	10.5
Foreign			5.2us-gaap_CurrentForeignTaxExpenseBenefit	4.9us-gaap_CurrentForeignTaxExpenseBenefit	12.0us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit)			112.1us-gaap_CurrentIncomeTaxExpenseBenefit	95.6us-gaap_CurrentIncomeTaxExpenseBenefit	55.0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	(246.4)us-gaap_DeferredIncomeTaxExpenseBenefit	4.7us-gaap_DeferredIncomeTaxExpenseBenefit	(15.5)us-gaap_DeferredIncomeTaxExpenseBenefit	(6.6)us-gaap_DeferredIncomeTaxExpenseBenefit	32.8us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	$ (202.9)us-gaap_IncomeTaxExpenseBenefit	$ 70.5us-gaap_IncomeTaxExpenseBenefit	$ 96.6us-gaap_IncomeTaxExpenseBenefit	$ 89.0us-gaap_IncomeTaxExpenseBenefit	$ 87.8us-gaap_IncomeTaxExpenseBenefit

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

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

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

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

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

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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