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Segment Reporting (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues:        
Revenues $ 1,002.7 $ 906.4 $ 2,898.7 $ 2,470.1
Gross Profit:        
Total Gross Profit 291.4 270.1 840.5 751.7
Operating Income (Loss):        
Total Operating Income 90.9 74.2 226.9 185.6
Amortization of Intangible Assets 11.9 18.6 38.8 44.7
Apex        
Revenues:        
Revenues 644.1 589.6 1,878.7 1,695.7
Gross Profit:        
Total Gross Profit 192.2 177.8 555.4 506.1
Operating Income (Loss):        
Total Operating Income 79.2 71.4 213.1 192.6
Amortization of Intangible Assets 4.0 6.6 15.5 19.7
Oxford        
Revenues:        
Revenues 152.5 152.8 455.3 455.3
Gross Profit:        
Total Gross Profit 61.9 62.7 183.3 187.3
Operating Income (Loss):        
Total Operating Income 13.6 15.2 36.3 39.8
Amortization of Intangible Assets 1.0 1.0 3.0 3.1
ECS        
Revenues:        
Revenues 206.1 164.0 564.7 319.1
Gross Profit:        
Total Gross Profit 37.3 29.6 101.8 58.3
Operating Income (Loss):        
Total Operating Income 12.7 4.3 30.5 8.0
Amortization of Intangible Assets 6.9 11.0 20.3 21.9
Corporate        
Operating Income (Loss):        
Total Operating Income [1] (14.6) (16.7) (53.0) (54.8)
Assignment | Apex        
Revenues:        
Revenues 629.8 575.2 1,835.0 1,653.8
Assignment | Oxford        
Revenues:        
Revenues 130.3 130.4 391.1 386.1
Permanent Placement | Apex        
Revenues:        
Revenues 14.3 14.4 43.7 41.9
Permanent Placement | Oxford        
Revenues:        
Revenues 22.2 22.4 64.2 69.2
Fixed-price Contract | ECS        
Revenues:        
Revenues 64.4 48.2 153.8 93.0
Time and materials Contract | ECS        
Revenues:        
Revenues 68.4 42.1 200.6 91.1
Cost-plus-fixed-fee Contract | ECS        
Revenues:        
Revenues $ 73.3 $ 73.7 $ 210.3 $ 135.0
[1]
Parent company operating expenses consisting of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.