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

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- Definition

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+ References

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Warranty maturity periods.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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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



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-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

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-URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56015-112765

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