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Operating Results of Discontinued Operations (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Discontinued Operations [Line Items]    
Income tax expense $ 0 $ (0.1)
Federal Signal Technologies
    
Discontinued Operations [Line Items]    
Net sales   28.5
Interest allocated to discontinued operations   0.9
Other costs and expenses   31.4
Loss before income taxes   (3.8)
Income tax expense   (0.1)
Loss from discontinued operations   $ (3.9)