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Deferred Income Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Deferred tax assets:      
Depreciation and amortization $ 11.1fss_DeferredTaxAssetsDepreciationAndAmortization $ 10.8fss_DeferredTaxAssetsDepreciationAndAmortization  
Accrued expenses 28.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 28.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Net operating loss, capital loss, alternative minimum tax, research and development, and foreign tax credit carryforwards 44.6fss_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards 62.8fss_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards  
Definite lived intangibles 1.6us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 1.7us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Pension benefits 35.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 23.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions  
Other 1.0us-gaap_DeferredTaxAssetsOther 1.1us-gaap_DeferredTaxAssetsOther  
Deferred revenue 0.1us-gaap_DeferredTaxAssetsDeferredIncome 0.1us-gaap_DeferredTaxAssetsDeferredIncome  
Gross deferred tax assets 122.4us-gaap_DeferredTaxAssetsGross 128.6us-gaap_DeferredTaxAssetsGross  
Valuation allowance (3.8)us-gaap_DeferredTaxAssetsValuationAllowance (9.8)us-gaap_DeferredTaxAssetsValuationAllowance (10.4)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 118.6us-gaap_DeferredTaxAssetsNet 118.8us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:      
Depreciation and amortization (5.8)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (3.7)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Expenses capitalized for book (1.4)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts (1.0)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts  
Pension benefits (13.4)fss_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationandBenefitsPensions (11.5)fss_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationandBenefitsPensions  
Intangibles liabilities (57.1)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (56.8)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets  
Deferred Tax Liabilities, Other (0.5)us-gaap_DeferredTaxLiabilitiesOther (0.3)us-gaap_DeferredTaxLiabilitiesOther  
Gross deferred tax liabilities (78.2)us-gaap_DeferredIncomeTaxLiabilities (73.3)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets $ 40.4us-gaap_DeferredTaxAssetsLiabilitiesNet $ 45.5us-gaap_DeferredTaxAssetsLiabilitiesNet