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Debt - Summary of Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Carrying Amounts and Fair Values of Financial Instruments [Line Items] |  |  |
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent |  | $ 48.6 | $ 50.2
Long term debt and capital lease obligations |  | 6.2 | 6.2
Long-term Debt |  |  |
Carrying Amounts and Fair Values of Financial Instruments [Line Items] |  |  |
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent | [1] | 48.6 | 50.2
Long-term Debt, Fair Value | [1] | $ 48.6 | $ 50.2
[1] | Long-term borrowings includes current portions of long-term debt and current portions of capital lease obligations of $6.2 million and $6.2 million as of June 30, 2015 and December 31, 2014, respectively.

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- Definition Carrying Amounts and Fair Values of Financial Instruments [Line Items] + References No definition available. + Details
Name: | fss_CarryingAmountsAndFairValuesOfFinancialInstrumentsLineItems
Namespace Prefix: | fss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long term debt and capital lease obligations current and non-current. + References No definition available. + Details
Name: | fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
Namespace Prefix: | fss_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_LongTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |