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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 898.5 |  | $ 707.9 | $ 768.0
Operating income | 67.1 |  | 57.7 | 103.2
Interest expense | 7.3 |  | 1.9 | 2.3
Debt settlement charges | 0.0 |  | 0.3 | 0.0
Other (income) expense, net | (1.2) |  | (1.3) | 1.0
Income before income taxes | 61.0 |  | 56.8 | 99.9
Total depreciation and amortization | 30.0 |  | 19.1 | 12.3
Total assets | 992.3 |  | 643.2 | 666.5
Total capital expenditures | 8.0 |  | 6.1 | 9.6
Environmental Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 692.6 |  | 490.7 | 534.1
Operating income | 72.4 |  | 54.1 | 96.9
Total depreciation and amortization | 25.7 |  | 14.5 | 7.3
Total assets | 746.4 |  | 393.3 | 250.6
Total capital expenditures | 5.2 |  | 3.7 | 4.5
Safety And Security Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 205.9 |  | 217.2 | 233.9
Operating income | 27.0 |  | 27.0 | 32.3
Total depreciation and amortization | 4.1 |  | 4.4 | 4.8
Total assets | 211.8 |  | 200.1 | 209.6
Total capital expenditures | 2.2 |  | 1.8 | 3.9
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | (32.3) | [1] | (23.4) | (26.0)
Total depreciation and amortization | 0.2 |  | 0.2 | 0.2
Total assets | 33.6 |  | 48.7 | 99.2
Total capital expenditures | 0.6 |  | 0.6 | 1.2
Segment, Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | 991.8 |  | 642.1 | 559.4
Segment, Discontinued Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | $ 0.5 |  | $ 1.1 | $ 107.1
[1] | Corporate operating expenses in the year ended December 31, 2017 include pension settlement charges of $6.1 million, as disclosed in Note 9 – Pensions.

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