Annual report pursuant to Section 13 and 15(d)

Business Segment Information - Additional Information (Details)

v3.20.4
Business Segment Information - Additional Information (Details) - Sales Revenue, Net - Customer Concentration Risk
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Various Governments      
Segment Reporting Information [Line Items]      
Concentration risk percentage 71.00% 71.00% 71.00%
U.S. Federal Government      
Segment Reporting Information [Line Items]      
Concentration risk percentage 36.60% 33.20% 31.30%