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Segment Information - Summary of Net Sales, Operating Income (Loss), and Total Assets by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Total net sales $ 273.8 $ 249.7  
Total operating income 25.8 19.6  
Interest expense 2.0 2.5  
Other expense, net 0.4 0.1  
Income before income taxes 23.4 17.0  
Total assets 1,070.2   $ 1,023.8
Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets 1,069.8   1,023.4
Discontinued Operations      
Segment Reporting Information [Line Items]      
Total assets 0.4   0.4
Environmental Solutions      
Segment Reporting Information [Line Items]      
Total net sales 219.5 196.6  
Total operating income 25.7 20.6  
Environmental Solutions | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets 825.7   775.2
Safety and Security Systems      
Segment Reporting Information [Line Items]      
Total net sales 54.3 53.1  
Total operating income 8.7 6.1  
Safety and Security Systems | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets 216.9   211.5
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Total operating income (8.6) $ (7.1)  
Corporate And Eliminations | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets $ 27.2   $ 36.7