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Segment Information by Geographic Area (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net sales [Abstract]    
Consolidated net sales $ 785.8us-gaap_SalesRevenueGoodsNet $ 873.4us-gaap_SalesRevenueGoodsNet
United States [Member]    
Net sales [Abstract]    
Consolidated net sales 472.9us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_US		 500.8us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_US
United Kingdom [Member]    
Net sales [Abstract]    
Consolidated net sales 99.4us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 148.8us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_GB
France    
Net sales [Abstract]    
Consolidated net sales 91.4us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_FR		 96.4us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_FR
Other Europe [Member]    
Net sales [Abstract]    
Consolidated net sales 81.8us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= syx_OthereuropeMember		 77.8us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= syx_OthereuropeMember
Other North America [Member]    
Net sales [Abstract]    
Consolidated net sales $ 40.3us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= syx_OtherNorthAmericaMember		 $ 49.6us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= syx_OtherNorthAmericaMember