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Components of Provision (Benefit) for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 3.0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ (1.8)us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	0.6us-gaap_CurrentForeignTaxExpenseBenefit	2.4us-gaap_CurrentForeignTaxExpenseBenefit	3.2us-gaap_CurrentForeignTaxExpenseBenefit
State and local	1.3us-gaap_CurrentStateAndLocalTaxExpenseBenefit	1.0us-gaap_CurrentStateAndLocalTaxExpenseBenefit	0.1us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current, Total	4.9us-gaap_CurrentIncomeTaxExpenseBenefit	3.4us-gaap_CurrentIncomeTaxExpenseBenefit	1.5us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	17.8us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(112.1)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	2.1us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign	(2.7)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	0.2us-gaap_DeferredForeignIncomeTaxExpenseBenefit	0.3us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and local	4.3us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	1.3us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred, Total	19.4fss_DeferredIncomeTaxExpenseBenefitContinuingOperations	(110.6)fss_DeferredIncomeTaxExpenseBenefitContinuingOperations	2.4fss_DeferredIncomeTaxExpenseBenefitContinuingOperations
Total income tax provision	$ 24.3us-gaap_IncomeTaxExpenseBenefit	$ (107.2)us-gaap_IncomeTaxExpenseBenefit	$ 3.9us-gaap_IncomeTaxExpenseBenefit

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