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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Total net sales $ 298.3 $ 279.8 $ 911.8 $ 836.0  
Total operating income 34.3 34.0 100.6 97.6  
Interest expense 1.1 1.2 3.3 4.5  
Other (income) expense, net (0.3) (0.1) (1.1) 2.1  
Income before income taxes 33.5 32.9 98.4 91.0  
Total assets 1,313.8   1,313.8   $ 1,208.8
Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 1,313.6   1,313.6   1,208.6
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total assets 0.2   0.2   0.2
Environmental Solutions          
Segment Reporting Information [Line Items]          
Total net sales 249.1 231.0 758.5 678.2  
Total operating income 30.8 33.0 96.4 91.0  
Environmental Solutions | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 1,015.0   1,015.0   926.8
Safety and Security Systems          
Segment Reporting Information [Line Items]          
Total net sales 49.2 48.8 153.3 157.8  
Total operating income 7.6 7.4 22.6 25.2  
Safety and Security Systems | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 220.4   220.4   225.5
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (4.1) $ (6.4) (18.4) $ (18.6)  
Corporate And Eliminations | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets $ 78.2   $ 78.2   $ 56.3