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Discontinued Operations - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 11, 2018
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Nov. 30, 2017
6.5% Notes | Senior notes            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Stated interest rate           6.50%
Public Safety & Security | Disposal Group, Held-for-sale, Not Discontinued Operations            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Purchase price, in cash $ 69.0          
Proceeds from divestiture 70.0          
Working capital retained 7.0          
Transaction costs $ 2.7          
Herley | Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impact of revenue       $ 1.8    
Impact of operating results       2.0    
Transaction-related costs   $ 0.0   2.7    
Herley | Disposed of by Sale | Selling, General and Administrative Expenses            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Depreciation and amortization   $ 0.0 $ 0.1 $ 0.1 $ 0.2