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Operating Results of Discontinued Operations (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Federal Signal Technologies
Dec. 31, 2011
Federal Signal Technologies
Dec. 31, 2010
Federal Signal Technologies
Dec. 31, 2011
China Wofe
Dec. 31, 2010
China Wofe
Sep. 01, 2010
Riverchase
Dec. 31, 2010
Riverchase
Discontinued Operations [Line Items]                    
Net sales       $ 87.0 $ 106.9 $ 93.4 $ 0.2 $ 1.5    
Interest allocated to discontinued operations       4.8            
Costs and expenses             0.5 3.2   1.3
Goodwill and intangible assets impairment       0.6 20.6 78.9        
Restructuring charges 1.4   4.4     0.6        
Other costs and expenses       100.0 116.2 103.2        
Loss before income taxes       (18.4) (29.9) (89.3) (0.3) (1.7)   (1.3)
Income tax benefit (3.6) (2.0) (2.9) 3.6 2.0 2.9        
Loss from discontinued operations       $ (14.8) $ (27.9) $ (86.4) $ (0.3) $ (1.7) $ 2.1 $ (1.3)