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Segment Reporting (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues:        
Revenues $ 1,197.9 $ 1,073.8 $ 3,430.7 $ 2,955.7
Gross Profit:        
Total Gross Profit 358.9 308.7 1,029.5 828.7
Operating Income (Loss):        
Total Operating Income 108.4 100.1 319.1 255.4
Depreciation 7.2 7.1 19.5 21.7
Amortization of intangible assets 17.9 15.9 45.3 39.9
Commercial Business        
Revenues:        
Revenues 900.0 774.9 2,583.5 2,136.7
Gross Profit:        
Total Gross Profit 297.8 251.1 852.1 678.1
Operating Income (Loss):        
Total Operating Income 108.7 98.5 319.6 258.8
Depreciation 5.0 3.5 12.0 10.4
Amortization of intangible assets 9.9 7.3 21.1 18.6
Federal Government Business        
Revenues:        
Revenues 297.9 298.9 847.2 819.0
Gross Profit:        
Total Gross Profit 61.1 57.6 177.4 150.6
Operating Income (Loss):        
Total Operating Income 23.0 23.3 66.4 56.8
Depreciation 1.3 2.3 4.2 6.8
Amortization of intangible assets 8.0 8.6 24.2 21.3
Assignment | Commercial Business        
Revenues:        
Revenues 631.4 587.3 1,888.0 1,687.2
Consulting | Commercial Business        
Revenues:        
Revenues 268.6 187.6 695.5 449.5
Firm-fixed-price | Federal Government Business        
Revenues:        
Revenues 91.7 94.5 242.9 217.0
Time and materials | Federal Government Business        
Revenues:        
Revenues 113.7 106.0 338.5 296.9
Cost reimbursable | Federal Government Business        
Revenues:        
Revenues $ 92.5 $ 98.4 $ 265.8 $ 305.1