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Debt - Summary of Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Carrying Amounts and Fair Values of Financial Instruments [Line Items] |  |  |  |
Short-term borrowings | $ 2.8 us-gaap_ShortTermBorrowings |  | $ 0 us-gaap_ShortTermBorrowings |
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent | 50.1 fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent |  | 50.2 fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent |
Long term debt and capital lease obligations | 6.2 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |  | 6.2 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |
Short-term Debt [Member] |  |  |  |
Carrying Amounts and Fair Values of Financial Instruments [Line Items] |  |  |  |
Short-term borrowings | 2.8 us-gaap_ShortTermBorrowings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermDebtMember |  | 0 us-gaap_ShortTermBorrowings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermDebtMember |
Short-term Debt, Fair Value | 2.8 us-gaap_ShorttermDebtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermDebtMember |  | 0 us-gaap_ShorttermDebtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermDebtMember |
Long-term Debt |  |  |  |
Carrying Amounts and Fair Values of Financial Instruments [Line Items] |  |  |  |
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent | 50.1 fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LongTermDebtMember | [1] | 50.2 fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LongTermDebtMember | [1]
Long-term Debt, Fair Value | $ 50.1 us-gaap_LongTermDebtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LongTermDebtMember | [1] | $ 50.2 us-gaap_LongTermDebtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LongTermDebtMember | [1]
[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 March 31, 2015 and December 31, 2014, respectively.

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- Details
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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than 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 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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Balance Type: | credit
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_ShorttermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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