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Segment Reporting Revenue by Customer Type (details) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from External Customer [Line Items]        
Revenues $ 936.8 $ 972.3 $ 1,927.3 $ 1,896.0
Department of Defense and Intelligence Agencies        
Revenue from External Customer [Line Items]        
Revenues 127.1 107.6 242.0 203.6
Federal Civilian        
Revenue from External Customer [Line Items]        
Revenues 96.0 71.3 180.6 131.5
Other        
Revenue from External Customer [Line Items]        
Revenues 16.6 11.7 29.8 23.5
ECS        
Revenue from External Customer [Line Items]        
Revenues $ 239.7 $ 190.6 $ 452.4 $ 358.6