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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Total net sales $ 224.4 $ 172.3 $ 402.2 $ 345.1  
Total operating income 18.7 14.3 30.0 30.4  
Interest expense 1.3 0.4 1.9 0.8  
Debt settlement charges 0.0 0.0 0.0 0.3  
Other income, net (0.2) (0.3) (0.5) (1.0)  
Income before income taxes 17.6 14.2 28.6 30.3  
Total assets 997.6   997.6   $ 643.2
Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 996.5   996.5   642.1
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total assets 1.1   1.1   1.1
Environmental Solutions          
Segment Reporting Information [Line Items]          
Total net sales 174.3 119.4 302.1 234.8  
Total operating income 21.0 14.9 31.3 31.4  
Environmental Solutions | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 763.4   763.4   393.3
Safety & Security Systems          
Segment Reporting Information [Line Items]          
Total net sales 50.1 52.9 100.1 110.3  
Total operating income 5.6 6.6 12.0 11.5  
Safety & Security Systems | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 205.8   205.8   200.1
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (7.9) $ (7.2) (13.3) $ (12.5)  
Corporate And Eliminations | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets $ 27.3   $ 27.3   $ 48.7