Annual report pursuant to Section 13 and 15(d)

Divestiture Activities - Narrative (Details)

v3.20.4
Divestiture Activities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 13, 2021
Jul. 12, 2019
Feb. 13, 2019
Mar. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Held for Sale | First Earnout            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Maximum total earnout proceeds         $ 35.0  
Held for Sale | Test Systems            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Total cash proceeds of divesture     $ 103.8      
Gain on sale, net of tax     80.1 $ 80.1    
Income taxes from divesture     $ 19.7 $ 19.7    
Net property, plant and equipment           $ 1.5
Held for Sale | Test Systems | Subsequent Event            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Contingent earn-outs $ 10.7          
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   $ 1.0        
Percentage of revenue (as a percentage)   1.00%     1.00%  
Pre-tax loss on sale   $ (1.3)     $ (1.3)