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Income Taxes - Components of Income Tax Expense (Benefit), Continuing Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income taxes:
U.S. Federal	$ 6.6us-gaap_CurrentFederalTaxExpenseBenefit	$ 13.6us-gaap_CurrentFederalTaxExpenseBenefit	$ 16.2us-gaap_CurrentFederalTaxExpenseBenefit
U.S. State	0.6us-gaap_CurrentStateAndLocalTaxExpenseBenefit	0.9us-gaap_CurrentStateAndLocalTaxExpenseBenefit	1.5us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	10.0us-gaap_CurrentForeignTaxExpenseBenefit	21.2us-gaap_CurrentForeignTaxExpenseBenefit	18.7us-gaap_CurrentForeignTaxExpenseBenefit
Current income taxes	17.2us-gaap_CurrentIncomeTaxExpenseBenefit	35.7us-gaap_CurrentIncomeTaxExpenseBenefit	36.4us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income taxes:
U.S. Federal	3.0us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(0.2)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(4.6)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
U.S. State	(0.8)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(0.4)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	1.1us-gaap_DeferredForeignIncomeTaxExpenseBenefit	17.5us-gaap_DeferredForeignIncomeTaxExpenseBenefit	18.1us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred income taxes	3.3us-gaap_DeferredIncomeTaxExpenseBenefit	17.3us-gaap_DeferredIncomeTaxExpenseBenefit	13.1us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	20.5us-gaap_IncomeTaxExpenseBenefit	53.0us-gaap_IncomeTaxExpenseBenefit	49.5us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations before income taxes from operations outside the United States	$ 77.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	$ 70.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	$ 104.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign

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