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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Total net sales $ 186.7 $ 179.7 $ 531.8 $ 581.6  
Total operating income 13.5 25.2 43.9 78.9  
Interest expense 0.6 0.6 1.4 1.8  
Debt settlement charges 0.0 0.0 0.3 0.0  
Other (income) expense, net (0.3) 0.3 (1.3) 1.5  
Income before income taxes 13.2 24.3 43.5 75.6  
Total assets 648.6   648.6   $ 666.5
Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 646.4   646.4   559.4
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total assets 2.2   2.2   107.1
Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (5.5) (5.6) (18.0) (18.9)  
Corporate and Eliminations | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 49.6   49.6   99.2
Environmental Solutions | Operating Segments          
Segment Reporting Information [Line Items]          
Total net sales 134.3 123.0 369.1 409.8  
Total operating income 12.5 21.5 43.9 74.6  
Environmental Solutions | Operating Segments | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 391.2   391.2   250.6
Safety & Security Systems | Operating Segments          
Segment Reporting Information [Line Items]          
Total net sales 52.4 56.7 162.7 171.8  
Total operating income 6.5 $ 9.3 18.0 $ 23.2  
Safety & Security Systems | Operating Segments | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets $ 205.6   $ 205.6   $ 209.6