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Segment Reporting (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues:        
Revenues $ 974.9 $ 831.9 $ 1,881.9 $ 1,697.3
Gross Profit:        
Total Gross Profit 276.3 227.5 520.0 470.1
Operating Income (Loss):        
Total Operating Income 87.9 69.1 155.3 133.8
Depreciation 7.1 6.5 14.6 13.2
Amortization of intangible assets 12.0 12.4 24.0 24.4
Commercial Business        
Revenues:        
Revenues 712.5 592.2 1,361.7 1,244.9
Gross Profit:        
Total Gross Profit 228.3 183.7 426.9 389.2
Operating Income (Loss):        
Total Operating Income 89.6 65.3 160.1 134.9
Depreciation 3.4 3.6 7.0 7.2
Amortization of intangible assets 5.6 5.4 11.3 10.8
Federal Government Business        
Revenues:        
Revenues 262.4 239.7 520.2 452.4
Gross Profit:        
Total Gross Profit 48.0 43.8 93.1 80.9
Operating Income (Loss):        
Total Operating Income 18.7 16.3 33.4 27.5
Depreciation 2.2 1.9 4.6 4.1
Amortization of intangible assets 6.4 7.0 12.7 13.6
Assignment | Commercial Business        
Revenues:        
Revenues 568.1 506.9 1,099.8 1,070.0
Consulting | Commercial Business        
Revenues:        
Revenues 144.4 85.3 261.9 174.9
Firm-fixed-price | Federal Government Business        
Revenues:        
Revenues 62.0 63.5 122.6 120.5
Time and materials | Federal Government Business        
Revenues:        
Revenues 100.2 81.4 190.9 153.8
Cost reimbursable | Federal Government Business        
Revenues:        
Revenues $ 100.2 $ 94.8 $ 206.7 $ 178.1