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Summary of Continuing Operations by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Total net sales $ 768.0 $ 779.1 $ 712.9
Total operating income 103.2 88.7 61.6
Interest expense 2.3 3.6 8.9
Debt settlement charges 0.0 0.0 8.7
Other expense, net 1.0 1.7 0.1
Income before income taxes 99.9 83.4 43.9
Total depreciation and amortization 12.3 11.5 11.0
Total identifiable assets 666.5 658.7 644.8
Total capital expenditures 9.6 13.7 11.6
Environmental Solutions      
Segment Reporting Information [Line Items]      
Total net sales 534.1 536.6 474.0
Total operating income 96.9 81.9 58.2
Total depreciation and amortization 7.3 6.8 6.1
Total identifiable assets 250.6 254.2 236.0
Total capital expenditures 4.5 6.2 4.5
Safety & Security Systems      
Segment Reporting Information [Line Items]      
Total net sales 233.9 242.5 238.9
Total operating income 32.3 32.1 26.1
Total depreciation and amortization 4.8 4.5 4.2
Total identifiable assets 209.6 208.3 213.4
Total capital expenditures 3.9 6.3 5.4
Corporate      
Segment Reporting Information [Line Items]      
Total operating income (26.0) (25.3) (22.7)
Total depreciation and amortization 0.2 0.2 0.7
Total identifiable assets 99.2 69.0 73.6
Total capital expenditures 1.2 1.2 1.7
Segment, Continuing Operations      
Segment Reporting Information [Line Items]      
Total identifiable assets 559.4 531.5 523.0
Segment, Discontinued Operations      
Segment Reporting Information [Line Items]      
Total identifiable assets $ 107.1 $ 127.2 $ 121.8