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Income Taxes Income tax rate breakdown (Details) (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, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S. federal									$ (5.0)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	$ 1.3us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	$ 12.6us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State and local									0.3us-gaap_CurrentStateAndLocalTaxExpenseBenefit	1.2us-gaap_CurrentStateAndLocalTaxExpenseBenefit	0.6us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign									1.6us-gaap_CurrentForeignTaxExpenseBenefit	3.3us-gaap_CurrentForeignTaxExpenseBenefit	0.9us-gaap_CurrentForeignTaxExpenseBenefit
Net current tax provision (benefit)									(3.1)us-gaap_CurrentIncomeTaxExpenseBenefit	5.8us-gaap_CurrentIncomeTaxExpenseBenefit	14.1us-gaap_CurrentIncomeTaxExpenseBenefit
U.S federal									(19.5)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	44.6us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(7.3)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local									(1.2)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	2.5us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign									(13.3)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	13.4us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(0.3)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Net valuation allowance increase (decrease)									9.9us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	(25.2)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	0.5us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Deferred income tax expense (benefit)									(24.1)us-gaap_DeferredIncomeTaxExpenseBenefit	35.3us-gaap_DeferredIncomeTaxExpenseBenefit	(7.1)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision (benefit) for income taxes	$ (11.3)us-gaap_IncomeTaxExpenseBenefit	$ (3.6)us-gaap_IncomeTaxExpenseBenefit	$ (6.7)us-gaap_IncomeTaxExpenseBenefit	$ (5.6)us-gaap_IncomeTaxExpenseBenefit	$ (10.5)us-gaap_IncomeTaxExpenseBenefit	$ 4.4us-gaap_IncomeTaxExpenseBenefit	$ 24.3us-gaap_IncomeTaxExpenseBenefit	$ 22.9us-gaap_IncomeTaxExpenseBenefit	$ (27.2)us-gaap_IncomeTaxExpenseBenefit	$ 41.1us-gaap_IncomeTaxExpenseBenefit	$ 7.0us-gaap_IncomeTaxExpenseBenefit

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