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Segment Information Classified Based on Geographic Location (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                      
Net sales $ 264.4us-gaap_SalesRevenueNet $ 219.3us-gaap_SalesRevenueNet $ 234.6us-gaap_SalesRevenueNet $ 200.2us-gaap_SalesRevenueNet $ 219.6us-gaap_SalesRevenueNet $ 209.3us-gaap_SalesRevenueNet $ 222.6us-gaap_SalesRevenueNet $ 199.8us-gaap_SalesRevenueNet $ 918.5us-gaap_SalesRevenueNet $ 851.3us-gaap_SalesRevenueNet $ 803.2us-gaap_SalesRevenueNet
Long-lived assets (excluding intangibles) 73.2fss_AssetsNoncurrentExcludingIntangibleAssets       68.4fss_AssetsNoncurrentExcludingIntangibleAssets       73.2fss_AssetsNoncurrentExcludingIntangibleAssets 68.4fss_AssetsNoncurrentExcludingIntangibleAssets 71.8fss_AssetsNoncurrentExcludingIntangibleAssets
U.S.                      
Segment Reporting Information [Line Items]                      
Net sales                 593.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
550.2us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
492.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
Long-lived assets (excluding intangibles) 53.5fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= country_US
      46.1fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= country_US
      53.5fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= country_US
46.1fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= country_US
54.5fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= country_US
Europe/Other                      
Segment Reporting Information [Line Items]                      
Net sales                 257.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= fss_EuropeOtherMember
244.6us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= fss_EuropeOtherMember
259.0us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= fss_EuropeOtherMember
Europe                      
Segment Reporting Information [Line Items]                      
Long-lived assets (excluding intangibles) 19.3fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
      21.9fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
      19.3fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
21.9fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
16.8fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Canada                      
Segment Reporting Information [Line Items]                      
Net sales                 67.1us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA
56.5us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA
51.5us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA
Other                      
Segment Reporting Information [Line Items]                      
Long-lived assets (excluding intangibles) $ 0.4fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AllOtherSegmentsMember
      $ 0.4fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AllOtherSegmentsMember
      $ 0.4fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AllOtherSegmentsMember
$ 0.4fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AllOtherSegmentsMember
$ 0.5fss_AssetsNoncurrentExcludingIntangibleAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AllOtherSegmentsMember