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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 |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Total net sales | $ 249.7 | $ 177.8 |
Total operating income | 19.6 | 11.4 |
Interest expense | 2.5 | 0.6 |
Other expense (income), net | 0.1 | (0.2) |
Income before income taxes | 17.0 | 11.0 |
Total assets | 1,008.1 |  | $ 992.3
Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 1,007.6 |  | 991.8
Discontinued Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 0.5 |  | 0.5
Environmental Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 196.6 | 127.8 |
Total operating income | 20.6 | 10.3 |
Environmental Solutions | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 768.2 |  | 746.4
Safety and Security Systems |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net sales | 53.1 | 50.0 |
Total operating income | 6.1 | 6.4 |
Safety and Security Systems | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 210.5 |  | 211.8
Corporate And Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (7.1) | $ (5.3) |
Corporate And Eliminations | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 28.9 |  | $ 33.6

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