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Discontinued Operations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 04, 2012
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Escrow identified for general representations and warranties period 18 months      
Remaining general escrow fund to be held 36 months      
Environmental remediation at the Pearland, Texas facility $ 1.3us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities     $ 1.3us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities
Estimated product liability obligations 3.0us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities     3.0us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities
Loss from discontinued operations and disposal, net of income tax benefit of $0.0 for both periods 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (0.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity    
Escrow Balance, Subsequent Release       7.0fss_EscrowBalanceSubsequentRelease
Escrow Deposit 4.0us-gaap_EscrowDeposit      
Escrow [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (Loss) on Disposition of Business     $ 22.0us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fss_EscrowMember