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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Total net sales $ 366.7 $ 334.7 $ 696.9 $ 613.5  
Total operating income 46.2 38.5 74.7 66.3  
Interest expense 1.9 1.1 3.2 2.2  
Other income, net (0.3) (0.3) (0.7) (0.8)  
Income before income taxes 44.6 37.7 72.2 64.9  
Total assets 1,443.8   1,443.8   $ 1,366.1
Environmental Solutions          
Segment Reporting Information [Line Items]          
Total net sales 306.3 281.3 580.5 509.4  
Total operating income 39.1 38.5 65.9 65.6  
Environmental Solutions | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 1,151.4   1,151.4   1,098.2
Safety and Security Systems          
Segment Reporting Information [Line Items]          
Total net sales 60.4 53.4 116.4 104.1  
Total operating income 10.3 7.8 18.2 15.0  
Safety and Security Systems | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 264.2   264.2   226.9
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (3.2) $ (7.8) (9.4) $ (14.3)  
Corporate And Eliminations | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets $ 28.2   $ 28.2   $ 41.0