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Income Taxes (Components of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal:
Current	$ (11.6)us-gaap_CurrentFederalTaxExpenseBenefit	$ 24.9us-gaap_CurrentFederalTaxExpenseBenefit	$ (23.2)us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	21.1us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(7.8)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(4.2)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State:
Current	(0.9)us-gaap_CurrentStateAndLocalTaxExpenseBenefit	5.6us-gaap_CurrentStateAndLocalTaxExpenseBenefit	3.0us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred	1.3us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(1.4)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(6.6)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign:
Current	5.9us-gaap_CurrentForeignTaxExpenseBenefit	3.9us-gaap_CurrentForeignTaxExpenseBenefit	2.3us-gaap_CurrentForeignTaxExpenseBenefit
Deferred	4.4us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(1.9)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(2.8)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total income tax expense (benefit)	$ 20.2us-gaap_IncomeTaxExpenseBenefit	$ 23.3us-gaap_IncomeTaxExpenseBenefit	$ (31.5)us-gaap_IncomeTaxExpenseBenefit

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

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