XML 38 R40.htm IDEA: XBRL DOCUMENT v2.4.1.9

Stock-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total payments for employees' tax obligations	$ 2.6us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation	$ 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of target shares earned			200.00%fss_PercentageOfTargetShares / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Shares withheld to satisfy tax withholding obligation	0.2us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Total payments for employees' tax obligations	$ 2.6us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember

X

- Definition

Percentage Of Target Shares

+ References

No definition available.

+ Details

Name:	fss_PercentageOfTargetShares
Namespace Prefix:	fss_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: