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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
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Short-term borrowings	$ 2.8us-gaap_ShortTermBorrowings		$ 0us-gaap_ShortTermBorrowings
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent	50.1fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent		50.2fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
Long term debt and capital lease obligations	6.2us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent		6.2us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Short-term Debt [Member]
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Short-term borrowings	2.8us-gaap_ShortTermBorrowings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermDebtMember		0us-gaap_ShortTermBorrowings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermDebtMember
Short-term Debt, Fair Value	2.8us-gaap_ShorttermDebtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermDebtMember		0us-gaap_ShorttermDebtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermDebtMember
Long-term Debt
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent	50.1fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LongTermDebtMember	[1]	50.2fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LongTermDebtMember	[1]
Long-term Debt, Fair Value	$ 50.1us-gaap_LongTermDebtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LongTermDebtMember	[1]	$ 50.2us-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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- Definition

Long term debt and capital lease obligations current and non-current.

+ References

No definition available.

+ Details

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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

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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.

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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

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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.

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