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Segment Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of operating segments									3us-gaap_NumberOfOperatingSegments
Net sales	$ 264.4us-gaap_SalesRevenueNet	$ 219.3us-gaap_SalesRevenueNet	$ 234.6us-gaap_SalesRevenueNet	$ 200.2us-gaap_SalesRevenueNet	$ 219.6us-gaap_SalesRevenueNet	$ 209.3us-gaap_SalesRevenueNet	$ 222.6us-gaap_SalesRevenueNet	$ 199.8us-gaap_SalesRevenueNet	$ 918.5us-gaap_SalesRevenueNet	$ 851.3us-gaap_SalesRevenueNet	$ 803.2us-gaap_SalesRevenueNet
Outside United States [Member]
Segment Reporting Information [Line Items]
Net sales									324.8us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = fss_OutsideUnitedStatesMember	301.1us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = fss_OutsideUnitedStatesMember	310.5us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = fss_OutsideUnitedStatesMember
Exports From U S To Other Regions [Member]
Segment Reporting Information [Line Items]
Net sales									$ 152.5us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = fss_ExportsFromUSToOtherRegionsMember	$ 131.1us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = fss_ExportsFromUSToOtherRegionsMember	$ 127.9us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = fss_ExportsFromUSToOtherRegionsMember

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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