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Summary of Continuing Operations by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Total net sales $ 707.9 $ 768.0 $ 779.1
Total operating income 57.7 103.2 88.7
Interest expense 1.9 2.3 3.6
Debt settlement charges 0.3 0.0 0.0
Other (income) expense, net (1.3) 1.0 1.7
Income before income taxes 56.8 99.9 83.4
Total depreciation and amortization 19.1 12.3 11.5
Total identifiable assets 643.2 666.5 658.7
Total capital expenditures 6.1 9.6 13.7
Environmental Solutions [Member]      
Segment Reporting Information [Line Items]      
Total net sales 490.7 534.1 536.6
Total operating income 54.1 96.9 81.9
Total depreciation and amortization 14.5 7.3 6.8
Total identifiable assets 393.3 250.6 254.2
Total capital expenditures 3.7 4.5 6.2
Safety And Security Systems [Member]      
Segment Reporting Information [Line Items]      
Total net sales 217.2 233.9 242.5
Total operating income 27.0 32.3 32.1
Total depreciation and amortization 4.4 4.8 4.5
Total identifiable assets 200.1 209.6 208.3
Total capital expenditures 1.8 3.9 6.3
Corporate      
Segment Reporting Information [Line Items]      
Total operating income (23.4) (26.0) (25.3)
Total depreciation and amortization 0.2 0.2 0.2
Total identifiable assets 48.7 99.2 69.0
Total capital expenditures 0.6 1.2 1.2
Segment, Continuing Operations      
Segment Reporting Information [Line Items]      
Total identifiable assets 642.1 559.4 531.5
Segment, Discontinued Operations      
Segment Reporting Information [Line Items]      
Total identifiable assets $ 1.1 $ 107.1 $ 127.2