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Segment Reporting (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues:        
Revenues $ 1,073.8 $ 904.4 $ 2,955.7 $ 2,601.7
Gross Profit:        
Total Gross Profit 308.7 236.3 828.7 706.4
Operating Income (Loss):        
Total Operating Income 100.1 73.5 255.4 207.3
Depreciation 7.1 7.5 21.7 20.7
Amortization of intangible assets 15.9 12.7 39.9 37.1
Commercial Business        
Revenues:        
Revenues 774.9 615.8 2,136.7 1,860.7
Gross Profit:        
Total Gross Profit 251.1 190.4 678.1 579.6
Operating Income (Loss):        
Total Operating Income 98.5 72.7 258.8 207.6
Depreciation 3.5 3.7 10.4 10.9
Amortization of intangible assets 7.3 5.7 18.6 16.5
Federal Government Business        
Revenues:        
Revenues 298.9 288.6 819.0 741.0
Gross Profit:        
Total Gross Profit 57.6 45.9 150.6 126.8
Operating Income (Loss):        
Total Operating Income 23.3 16.7 56.8 44.3
Depreciation 2.3 2.5 6.8 6.5
Amortization of intangible assets 8.6 7.0 21.3 20.6
Assignment | Commercial Business        
Revenues:        
Revenues 587.3 519.2 1,687.2 1,589.2
Consulting | Commercial Business        
Revenues:        
Revenues 187.6 96.6 449.5 271.5
Firm-fixed-price | Federal Government Business        
Revenues:        
Revenues 94.5 82.0 217.0 201.2
Time and materials | Federal Government Business        
Revenues:        
Revenues 106.0 80.8 296.9 234.6
Cost reimbursable | Federal Government Business        
Revenues:        
Revenues $ 98.4 $ 125.8 $ 305.1 $ 305.2