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Operating Results of Discontinued Operations (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Discontinued Operations [Line Items]      
Income tax benefit $ (0.8) $ (3.6) $ (2.0)
Federal Signal Technologies
      
Discontinued Operations [Line Items]      
Net sales   87.0 106.9
Interest allocated to discontinued operations   4.8 0
Goodwill and intangible assets impairment   0.6 20.6
Costs and expenses   100.0 116.2
Loss before income taxes   (18.4) (29.9)
Income tax benefit   3.6 2.0
Loss from discontinued operations   (14.8) (27.9)
China Wofe
      
Discontinued Operations [Line Items]      
Net sales      0.2
Costs and expenses      0.5
Loss before income taxes      (0.3)
Income tax benefit     0
Loss from discontinued operations      $ (0.3)