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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | $ 248.7 | $ 186.7 | $ 650.9 | $ 531.8 |
Total operating income | 22.2 | 13.5 | 52.2 | 43.9 |
Interest expense | 2.7 | 0.6 | 4.6 | 1.4 |
Debt settlement charges | 0.0 | 0.0 | 0.0 | 0.3 |
Other income, net | (0.5) | (0.3) | (1.0) | (1.3) |
Income before income taxes | 20.0 | 13.2 | 48.6 | 43.5 |
Total assets | 997.2 |  | 997.2 |  | $ 643.2
Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 996.2 |  | 996.2 |  | 642.1
Discontinued Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 1.0 |  | 1.0 |  | 1.1
Environmental Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 198.5 | 134.3 | 500.6 | 369.1 |
Total operating income | 21.2 | 12.5 | 52.5 | 43.9 |
Environmental Solutions | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 761.6 |  | 761.6 |  | 393.3
Safety & Security Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 50.2 | 52.4 | 150.3 | 162.7 |
Total operating income | 6.1 | 6.5 | 18.1 | 18.0 |
Safety & Security Systems | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 206.3 |  | 206.3 |  | 200.1
Corporate And Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income | (5.1) | $ (5.5) | (18.4) | $ (18.0) |
Corporate And Eliminations | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | $ 28.3 |  | $ 28.3 |  | $ 48.7

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