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Operating Results of Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations [Line Items]
Loss before income taxes	$ (0.4)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income tax benefit	0.3us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	(0.8)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	(3.6)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Federal Signal Technologies
Discontinued Operations [Line Items]
Net sales			87.0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_StatementBusinessSegmentsAxis = fss_FederalSignalTechnologiesMember
Interest allocated to discontinued operations			4.8us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense / us-gaap_StatementBusinessSegmentsAxis = fss_FederalSignalTechnologiesMember
Costs and expenses			100.6us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = fss_FederalSignalTechnologiesMember
Loss before income taxes			(18.4)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_StatementBusinessSegmentsAxis = fss_FederalSignalTechnologiesMember
Income tax benefit			3.6us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_StatementBusinessSegmentsAxis = fss_FederalSignalTechnologiesMember
Loss from discontinued operations			$ (14.8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_StatementBusinessSegmentsAxis = fss_FederalSignalTechnologiesMember

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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