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Segment Information - Summary of Net Sales, Operating Income (Loss), and Total Assets by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Total net sales | $ 172.8 | $ 196.5 |
Total operating income | 16.1 | 24.5 |
Interest expense | 0.4 | 0.6 |
Debt settlement charges | 0.3 | 0.0 |
Other (income) expense, net | (0.7) | 1.2 |
Income before income taxes | 16.1 | 22.7 |
Total identifiable assets | 583.2 |  | $ 666.5
Discontinued Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total identifiable assets | 8.2 |  | 107.1
Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total identifiable assets | 575.0 |  | 559.4
Corporate and Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (5.3) | (6.0) |
Total identifiable assets | 89.0 |  | 99.2
Environmental Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 115.4 | 140.2 |
Total operating income | 16.5 | 23.9 |
Total identifiable assets | 275.3 |  | 250.6
Safety And Security Systems |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 57.4 | 56.3 |
Total operating income | 4.9 | $ 6.6 |
Total identifiable assets | $ 210.7 |  | $ 209.6

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