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Segment Information - Summary of Net Sales, Operating Income (Loss), and Total Assets by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Total net sales $ 172.8 $ 196.5  
Total operating income 16.1 24.5  
Interest expense 0.4 0.6  
Debt settlement charges 0.3 0.0  
Other (income) expense, net (0.7) 1.2  
Income before income taxes 16.1 22.7  
Total identifiable assets 583.2   $ 666.5
Discontinued Operations [Member]      
Segment Reporting Information [Line Items]      
Total identifiable assets 8.2   107.1
Continuing Operations [Member]      
Segment Reporting Information [Line Items]      
Total identifiable assets 575.0   559.4
Corporate and Eliminations      
Segment Reporting Information [Line Items]      
Total operating income (5.3) (6.0)  
Total identifiable assets 89.0   99.2
Environmental Solutions      
Segment Reporting Information [Line Items]      
Total net sales 115.4 140.2  
Total operating income 16.5 23.9  
Total identifiable assets 275.3   250.6
Safety And Security Systems      
Segment Reporting Information [Line Items]      
Total net sales 57.4 56.3  
Total operating income 4.9 $ 6.6  
Total identifiable assets $ 210.7   $ 209.6