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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
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.