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Pensions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Contributions to certain multiemployer pension plans $ 0.2 $ 0.3 $ 0.3
Amortization of actuarial loss 5.2    
Cost of defined contribution pension plans 7.0 6.3 5.8
Defined Benefit Postretirement Health Coverage
      
Defined Benefit Plan Disclosure [Line Items]      
Eligible age for pension plan benefits 60 years    
Minimum service period to be eligible for pension plan benefits 15 years    
Accumulated postretirement benefit liabilities 0.5 1.0  
Federal Signal common stock
      
Defined Benefit Plan Disclosure [Line Items]      
Equity securities, common stock (shares) 0.9    
Equity securities, common stock 13.6 7.1  
U.S. Benefit Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Funded status 29.9 67.5  
Expected contribution to defined benefit plan 8.8    
Accumulated postretirement benefit liabilities 157.3 177.2  
U.S. Benefit Plans | Equity Securities
      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 40.00%    
Maximum target allocation 60.00%    
U.S. Benefit Plans | Fixed Income Securities
      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 25.00%    
Maximum target allocation 38.00%    
U.S. Benefit Plans | Other Investments [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 15.00%    
Maximum target allocation 25.00%    
U.S. Benefit Plans | Maximum
      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average target return of pension plans 7.60%    
Non-U.S. Benefit Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Funded status (1.4) 10.8  
Expected contribution to defined benefit plan 1.3    
Accumulated postretirement benefit liabilities 60.4 65.6  
Non-U.S. Benefit Plan | Equity Securities
      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 50.00%    
Maximum target allocation 70.00%    
Non-U.S. Benefit Plan | Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 30.00%    
Maximum target allocation 50.00%    
Foreign benefit plan underfunded [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Funded status $ 1.1