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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Commitments Disclosure [Line Items] |  |
Amount outstanding standby letters of credit | $ 47.2 us-gaap_LettersOfCreditOutstandingAmount |
Provisions to expense | 8.8 fss_ProvisionsToExpense | 10.1 fss_ProvisionsToExpense
Reserves related to environmental remediation | 1.3 us-gaap_LiabilitiesSubjectToCompromiseEnvironmentalContingencies | 1.4 us-gaap_LiabilitiesSubjectToCompromiseEnvironmentalContingencies
Minimum |  |
Commitments Disclosure [Line Items] |  |
Warranty Maturity Periods | 1 year |
Maximum |  |
Commitments Disclosure [Line Items] |  |
Warranty Maturity Periods | 5 years |
Environmental Solutions |  |
Commitments Disclosure [Line Items] |  |
Provisions to expense | $ 1.3 fss_ProvisionsToExpense / us-gaap_StatementBusinessSegmentsAxis = fss_EnvironmentalSolutionsMember | $ 0.8 fss_ProvisionsToExpense / us-gaap_StatementBusinessSegmentsAxis = fss_EnvironmentalSolutionsMember

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- Definition Provisions To Expense. + References No definition available. + Details
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- Definition Warranty maturity periods. + References No definition available. + Details
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- Definition The amount of environmental remediation liabilities included in liabilities subject to compromise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55717-112764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56015-112765 + Details
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