Annual report pursuant to Section 13 and 15(d)

Divestiture Activities - Narrative (Details)

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Divestiture Activities - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 12, 2019
Feb. 13, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Held for Sale | First Earnout          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Maximum total earnout proceeds       $ 35,000,000.0  
Held for Sale | Second Earnout          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Maximum total earnout proceeds       0  
Held for Sale | Test Systems          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net Property, Plant and Equipment       1,500,000 $ 3,521,000
Impairment loss         $ 0
Total cash proceeds of divesture   $ 103,800,000      
Gain on sale, net of tax   $ 80,100,000 $ 80,100,000    
Income taxes from divesture     $ 19,700,000 19,700,000  
Disposed of by Sale | Airfield Lighting Product Line          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale $ 1,000,000.0        
Percentage of revenue (as a percentage)         1.00%
Pre-tax loss on sale       $ (1,300,000)