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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 279.4 | $ 269.4 | $ 291.0 | $ 249.7 | $ 247.6 | $ 248.7 | $ 224.4 | $ 177.8 | $ 1,089.5 | $ 898.5 | $ 707.9
Operating income |  |  |  |  |  |  |  |  | 121.5 | 73.6 | 60.8
Interest expense |  |  |  |  |  |  |  |  | 9.3 | 7.3 | 1.9
Debt settlement charges |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.3
Pension settlement charges |  |  |  |  | 6.1 |  |  |  | 0.0 | 6.1 | 0.0
Other expense (income), net |  |  |  |  |  |  |  |  | 0.6 | (0.8) | 1.8
Income before income taxes |  |  |  |  |  |  |  |  | 111.6 | 61.0 | 56.8
Total depreciation and amortization |  |  |  |  |  |  |  |  | 36.4 | 30.0 | 19.1
Total assets | 1,023.8 |  |  |  | 992.3 |  |  |  | 1,023.8 | 992.3 | 643.2
Total capital expenditures |  |  |  |  |  |  |  |  | 14.1 | 8.0 | 6.1
Environmental Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 863.5 | 692.6 | 490.7
Operating income |  |  |  |  |  |  |  |  | 113.0 | 72.4 | 54.5
Total depreciation and amortization |  |  |  |  |  |  |  |  | 32.6 | 25.7 | 14.5
Total assets | 775.2 |  |  |  | 746.4 |  |  |  | 775.2 | 746.4 | 393.3
Total capital expenditures |  |  |  |  |  |  |  |  | 11.1 | 5.2 | 3.7
Safety And Security Systems |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 226.0 | 205.9 | 217.2
Operating income |  |  |  |  |  |  |  |  | 34.1 | 27.0 | 27.9
Total depreciation and amortization |  |  |  |  |  |  |  |  | 3.7 | 4.1 | 4.4
Total assets | 211.5 |  |  |  | 211.8 |  |  |  | 211.5 | 211.8 | 200.1
Total capital expenditures |  |  |  |  |  |  |  |  | 2.0 | 2.2 | 1.8
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (25.6) | (25.8) | (21.6)
Total depreciation and amortization |  |  |  |  |  |  |  |  | 0.1 | 0.2 | 0.2
Total assets | 36.7 |  |  |  | 33.6 |  |  |  | 36.7 | 33.6 | 48.7
Total capital expenditures |  |  |  |  |  |  |  |  | 1.0 | 0.6 | 0.6
Segment, Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets | 1,023.4 |  |  |  | 991.8 |  |  |  | 1,023.4 | 991.8 | 642.1
Segment, Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 0.4 |  |  |  | $ 0.5 |  |  |  | $ 0.4 | $ 0.5 | $ 1.1

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