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Discontinued Operations - Operating Results of Discontinued Operations (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax benefit $ (0.3) $ (2.9) $ (0.1) $ (3.5)
Federal Signal Technologies
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net sales   24.9   87.0
Interest allocated to discontinued operations   1.7   4.8
Other costs and expenses   33.1   99.9
Loss before income taxes   (9.9)   (17.7)
Income tax benefit   2.9   3.5
Loss from discontinued operations   $ (7.0)   $ (14.2)