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Debt - Summary of Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent	$ 68.6		$ 92.1
Long-term Debt
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent	68.6	[1]	92.1	[1]
Long-term Debt, Fair Value	$ 68.6	[1]	$ 92.1	[1]
[1] Long-term debt includes current portions of long-term debt and current portions of capital lease obligations of $7.9 million and $7.4 million as of September 30, 2014 and December 31, 2013, respectively.

X

- Details

Name:	fss_CarryingAmountsAndFairValuesOfFinancialInstrumentsLineItems
Namespace Prefix:	fss_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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