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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | $ 224.4 | $ 172.3 | $ 402.2 | $ 345.1 |
Total operating income | 18.7 | 14.3 | 30.0 | 30.4 |
Interest expense | 1.3 | 0.4 | 1.9 | 0.8 |
Debt settlement charges | 0.0 | 0.0 | 0.0 | 0.3 |
Other income, net | (0.2) | (0.3) | (0.5) | (1.0) |
Income before income taxes | 17.6 | 14.2 | 28.6 | 30.3 |
Total assets | 997.6 |  | 997.6 |  | $ 643.2
Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 996.5 |  | 996.5 |  | 642.1
Discontinued Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 1.1 |  | 1.1 |  | 1.1
Environmental Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 174.3 | 119.4 | 302.1 | 234.8 |
Total operating income | 21.0 | 14.9 | 31.3 | 31.4 |
Environmental Solutions | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 763.4 |  | 763.4 |  | 393.3
Safety & Security Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 50.1 | 52.9 | 100.1 | 110.3 |
Total operating income | 5.6 | 6.6 | 12.0 | 11.5 |
Safety & Security Systems | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 205.8 |  | 205.8 |  | 200.1
Corporate And Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income | (7.9) | $ (7.2) | (13.3) | $ (12.5) |
Corporate And Eliminations | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | $ 27.3 |  | $ 27.3 |  | $ 48.7

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