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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax [Line Items]              
Deferred tax assets $ 18.8us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent $ 12.4us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent   $ 18.8us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent $ 12.4us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent    
Accumulated undistributed earnings of certain foreign subsidiaries 40.9us-gaap_UndistributedEarningsOfForeignSubsidiaries 59.2us-gaap_UndistributedEarningsOfForeignSubsidiaries   40.9us-gaap_UndistributedEarningsOfForeignSubsidiaries 59.2us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Previously undistributed earnings of foreign subsidiaries to be repatriated in the future 24.3fss_UndistributedEarningsOfForeignSubsidiariesSubjectToRepatriation     24.3fss_UndistributedEarningsOfForeignSubsidiariesSubjectToRepatriation      
Deferred tax liabilities related to previously undistributed earnings of foreign subsidiaries to be repatriated in the future 9.9fss_DeferredIncomeTaxLiabilitiesRepatriationOfForeignEarnings     9.9fss_DeferredIncomeTaxLiabilitiesRepatriationOfForeignEarnings      
Deferred tax asset, federal net operating loss carryforwards 5.1us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 7.5us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic   5.1us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 7.5us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
Deferred tax asset, state net operating loss carryforwards 5.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 7.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal   5.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 7.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
Deferred tax asset, foreign net operating loss carryforwards 3.0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 5.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign   3.0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 5.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign    
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Motor Vehicle Credits 0.2fss_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMotorVehicleCredits 0.2fss_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMotorVehicleCredits   0.2fss_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMotorVehicleCredits 0.2fss_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMotorVehicleCredits    
Deferred tax asset, U.S. research tax credit carryforwards 5.0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 7.9us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch   5.0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 7.9us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch    
Deferred tax asset, U.S. foreign tax credits carryforwards 22.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 31.0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign   22.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 31.0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign    
Deferred tax asset, U.S. alternative minimum tax credits carryforwards 3.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 3.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax   3.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 3.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax    
Deferred tax asset, valuation allowance 3.8us-gaap_DeferredTaxAssetsValuationAllowance 9.8us-gaap_DeferredTaxAssetsValuationAllowance 10.4us-gaap_DeferredTaxAssetsValuationAllowance 3.8us-gaap_DeferredTaxAssetsValuationAllowance 9.8us-gaap_DeferredTaxAssetsValuationAllowance    
Total deferred tax assets 118.6us-gaap_DeferredTaxAssetsNet 118.8us-gaap_DeferredTaxAssetsNet   118.6us-gaap_DeferredTaxAssetsNet 118.8us-gaap_DeferredTaxAssetsNet    
Income taxes paid       8.2us-gaap_IncomeTaxesPaid 4.0us-gaap_IncomeTaxesPaid 2.9us-gaap_IncomeTaxesPaid  
Unrecognized tax benefits 2.8us-gaap_UnrecognizedTaxBenefits 4.8us-gaap_UnrecognizedTaxBenefits   2.8us-gaap_UnrecognizedTaxBenefits 4.8us-gaap_UnrecognizedTaxBenefits 4.0us-gaap_UnrecognizedTaxBenefits 4.3us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that, interests 0.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued   0.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 3.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 4.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   3.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 4.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount         (3.4)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes    
Decrease in valuation allowance 3.5us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 6.7us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 102.4us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount        
Income tax (expense) benefit       24.3us-gaap_IncomeTaxExpenseBenefit (107.2)us-gaap_IncomeTaxExpenseBenefit 3.9us-gaap_IncomeTaxExpenseBenefit  
Effective Income Tax Rate Reconciliation, Percent       27.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations (202.30%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 15.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Unrecognized tax benefits, period increase (decrease)       (1.0)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease      
Change in enacted tax rate       0.4us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate      
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Income Tax [Line Items]              
Deferred tax asset, tax credit carryforwards expiration year       2019      
Internal Revenue Service (IRS)              
Income Tax [Line Items]              
Deferred tax asset, net operating loss carryforwards expiration year       2027      
State and Local Jurisdiction              
Income Tax [Line Items]              
Deferred tax asset, net operating loss carryforwards expiration year       2015      
Foreign Tax Authority              
Income Tax [Line Items]              
Deferred tax asset, tax credit carryforwards expiration year       2017      
Foreign Tax Authority | United Kingdom              
Income Tax [Line Items]              
Income tax (expense) benefit         0.8us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_GB		    
Foreign Tax Authority | Finland              
Income Tax [Line Items]              
Income tax (expense) benefit         (0.8)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_FI		    
Other Noncurrent Liabilities [Member]              
Income Tax [Line Items]              
Deferred tax assets 4.0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		     4.0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		      
Current Deferred Tax Assets [Member]              
Income Tax [Line Items]              
Unrecognized tax benefits, period increase (decrease)       $ (0.3)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_BalanceSheetLocationAxis
= fss_CurrentDeferredTaxAssetsMember