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Segment Information - Summary of Net Sales, Operating Income (Loss), and Total Assets by Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Total net sales $ 221.6us-gaap_Revenues $ 200.2us-gaap_Revenues  
Total operating income 24.8us-gaap_OperatingIncomeLoss 12.8us-gaap_OperatingIncomeLoss  
Interest expense 0.6us-gaap_InterestExpense 1.0us-gaap_InterestExpense  
Other expense, net 0.9us-gaap_OtherNonoperatingIncomeExpense 0us-gaap_OtherNonoperatingIncomeExpense  
Income before income taxes 23.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 11.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest  
Total identifiable assets 649.0us-gaap_Assets   658.7us-gaap_Assets
Discontinued Operations [Member]      
Segment Reporting Information [Line Items]      
Total identifiable assets 4.2us-gaap_Assets
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
  4.2us-gaap_Assets
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Continuing Operations [Member]      
Segment Reporting Information [Line Items]      
Total identifiable assets 644.8us-gaap_Assets
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
  654.5us-gaap_Assets
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Corporate and Eliminations      
Segment Reporting Information [Line Items]      
Total operating income (6.0)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= fss_CorporateAndEliminationsMember
(5.9)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= fss_CorporateAndEliminationsMember
 
Total identifiable assets 57.3us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= fss_CorporateAndEliminationsMember
  68.0us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= fss_CorporateAndEliminationsMember
Environmental Solutions      
Segment Reporting Information [Line Items]      
Total net sales 140.2us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= fss_EnvironmentalSolutionsMember
120.7us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= fss_EnvironmentalSolutionsMember
 
Total operating income 23.9us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= fss_EnvironmentalSolutionsMember
15.2us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= fss_EnvironmentalSolutionsMember
 
Total identifiable assets 273.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fss_EnvironmentalSolutionsMember
  254.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fss_EnvironmentalSolutionsMember
Safety And Security Systems      
Segment Reporting Information [Line Items]      
Total net sales 56.3us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= fss_SafetyAndSecuritySystemsMember
55.0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= fss_SafetyAndSecuritySystemsMember
 
Total operating income 6.6us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= fss_SafetyAndSecuritySystemsMember
4.3us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= fss_SafetyAndSecuritySystemsMember
 
Total identifiable assets 203.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fss_SafetyAndSecuritySystemsMember
  208.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fss_SafetyAndSecuritySystemsMember
Fire Rescue      
Segment Reporting Information [Line Items]      
Total net sales 25.1us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= fss_FireRescueMember
24.5us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= fss_FireRescueMember
 
Total operating income 0.3us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= fss_FireRescueMember
(0.8)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= fss_FireRescueMember
 
Total identifiable assets $ 110.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fss_FireRescueMember
  $ 124.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fss_FireRescueMember