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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Operating results of discontinued operations        
Income tax benefit $ (2.9) $ (0.3) $ (3.5) $ (0.3)
Federal Signal Technologies [Member]
        
Operating results of discontinued operations        
Net sales 24.9 26.4 87.0 78.6
Interest allocated to discontinued operations 1.7   4.8  
Other cost and expenses 33.1 27.3 99.9 84.6
Loss before income taxes (9.9) (0.9) (17.7) (6.0)
Income tax benefit 2.9 0.3 3.5 0.3
Loss from discontinued operations (7.0) (0.6) (14.2) (5.7)
China WOFE [Member]
        
Operating results of discontinued operations        
Net sales          0.2
Cost and expenses          (0.5)
Loss before income taxes          (0.3)
Income tax benefit            
Loss from discontinued operations          $ (0.3)