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Discontinued Operations - Operating Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income tax benefit $ 0.1 $ (0.8) $ 3.4
Fire Rescue      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income tax benefit     4.6
Fire Rescue | Discontinued Operations, Held-for-sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net sales [1]     4.2
Cost of sales [1]     3.9
Gross profit [1]     0.3
Selling, engineering, general and administrative expenses [1]     1.1
Operating loss [1]     (0.8)
Other income, net [1]     0.0
Loss before income taxes [1]     (0.8)
Income tax benefit [1]     (0.2)
Net loss from operations [1]     $ (0.6)
[1] Only includes activity in the period up to the completion of the sale on January 29, 2016.