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Pensions - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Contributions to certain multiemployer pension plans $ 0.2 $ 0.2 $ 0.2
Purchases of common stock 10.6 10.3 0.0
Amortization of actuarial loss 6.2    
Cost of defined contribution pension plans 7.5 7.1 7.0
Cash dividends paid to stockholders $ 15.6 5.6 $ 0.0
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 $ 0.5  
Federal Signal common stock      
Defined Benefit Plan Disclosure [Line Items]      
Equity securities, common stock (shares) 0.2    
Equity securities, common stock $ 3.6    
U.S. Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average target return of pension plans 7.80% 7.60% 7.90%
Purchases of common stock $ 3.6    
Funded status 46.2 $ 52.3  
Expected contribution to defined benefit plan 4.8    
Accumulated postretirement benefit liabilities 173.5 $ 184.4  
Cash dividends paid to stockholders $ 0.1    
U.S. Benefit Plans | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 45.00%    
Maximum target allocation 75.00%    
U.S. Benefit Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 15.00%    
Maximum target allocation 45.00%    
U.S. Benefit Plans | Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 0.00%    
Maximum target allocation 20.00%    
U.S. Benefit Plans | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average target return of pension plans 7.80%    
Non-U.S. Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average target return of pension plans 4.70% 5.90% 5.10%
Funded status $ 1.4 $ 3.7  
Expected contribution to defined benefit plan 1.5    
Accumulated postretirement benefit liabilities $ 55.7 $ 62.7  
Non-U.S. Benefit Plan | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 50.00%    
Maximum target allocation 75.00%    
Non-U.S. Benefit Plan | Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation 25.00%    
Maximum target allocation 50.00%