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Discontinued Operations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended
Sep. 04, 2012
Jun. 21, 2012
May 31, 2012
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2010
Jun. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Federal Signal Technologies
Dec. 31, 2010
Federal Signal Technologies
Dec. 31, 2011
Trade Names
Federal Signal Technologies
Dec. 31, 2010
Trade Names
Federal Signal Technologies
Sep. 04, 2012
Working Capital Adjustment
Sep. 04, 2012
Cash
Sep. 04, 2012
Escrow
Dec. 31, 2013
Other current assets [Member]
Dec. 31, 2012
Deferred charges and other assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                                  
Loss on discontinued operations and disposal       $ (0.4) $ 0.8 $ 0.3 $ (0.5) $ 0.1 [1] $ 19.1 [2] $ 26.1 $ 4.2 [3]     $ 0.2 $ 49.5 $ 27.3                  
Severance costs                           0.6                      
Proceeds from sale agreement 110.0 110.0                                     5.9 82.1 22.0    
Assets held for sale carrying value   121.1                                              
Fair value less cost to sell   97.6                                              
Asset held for sale fair value   101.0                                              
Cost to sell assets held for sale   3.4                                              
Impairment charges                   0.6     23.5                        
Escrow receivable                 5.0                             7.8 8.0
Increase in carrying value of asset held for sale                 0.8                                
Transaction cost                 0.5                                
Total loss on disposal                 12.2           34.7                    
Escrow identified for general representations and warranties period                           18 months                      
Remaining general escrow fund to be held                           36 months                      
Subsequent claim by buyer       0.8                   0.8                      
Escrow release       7.0                   7.0                      
Goodwill impairment charges                                 14.8 67.1              
Impairment charges of intangible assets                                     7.4 11.8          
Goodwill adjustment                       1.6                          
Gain on discontinued operations related to the liquidation of the assets of the China WOFE business                             0.4                    
Loss from discontinued operations, costs associated with wind down of business                               0.5                  
Proceed from sale of Pearland     0.9                                            
Pre tax gain     0.4                                            
Environmental remediation at the Pearland, Texas facility       1.4       1.8           1.4 1.8                    
Estimated product liability obligations       $ 3.6       $ 4.6           $ 3.6 $ 4.6                    
[1] Income from continuing operations includes $0.6 million of restructuring charges.
[2] Income from continuing operations includes $1.9 million of debt settlement charges associated with a prior debt refinancing.
[3] Income from continuing operations includes $1.6 million of debt settlement charges associated with a prior debt refinancing and $0.9 million of restructuring charges.