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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

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