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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

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