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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, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Total net sales $ 330.2 $ 278.8  
Total operating income 28.5 27.8  
Interest expense 1.3 1.1  
Other income, net (0.4) (0.5)  
Income before income taxes 27.6 27.2  
Total assets 1,425.1   $ 1,366.1
Environmental Solutions      
Segment Reporting Information [Line Items]      
Total net sales 274.2 228.1  
Total operating income 26.8 27.1  
Environmental Solutions | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets 1,129.6   1,098.2
Safety and Security Systems      
Segment Reporting Information [Line Items]      
Total net sales 56.0 50.7  
Total operating income 7.9 7.2  
Safety and Security Systems | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets 258.5   226.9
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Total operating income (6.2) $ (6.5)  
Corporate And Eliminations | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets $ 37.0   $ 41.0