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Segment Reporting (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues:    
Revenues $ 923.7 $ 685.2
Gross Profit:    
Total Gross Profit 263.9 217.7
Operating Income (Loss):    
Total Operating Income 62.7 45.7
Amortization of Intangible Assets 13.8 7.6
Apex    
Revenues:    
Revenues 606.1 538.5
Gross Profit:    
Total Gross Profit 175.4 158.6
Operating Income (Loss):    
Total Operating Income 61.0 56.3
Amortization of Intangible Assets 6.0 6.5
Oxford    
Revenues:    
Revenues 149.6 146.7
Gross Profit:    
Total Gross Profit 58.9 59.1
Operating Income (Loss):    
Total Operating Income 11.7 9.8
Amortization of Intangible Assets 1.0 1.1
ECS    
Revenues:    
Revenues 168.0 0.0
Gross Profit:    
Total Gross Profit 29.6 0.0
Operating Income (Loss):    
Total Operating Income 6.9 0.0
Amortization of Intangible Assets 6.8 0.0
Corporate    
Operating Income (Loss):    
Total Operating Income [1] (16.9) (20.4)
Assignment | Apex    
Revenues:    
Revenues 592.2 524.9
Assignment | Oxford    
Revenues:    
Revenues 129.4 125.4
Permanent Placement | Apex    
Revenues:    
Revenues 13.9 13.6
Permanent Placement | Oxford    
Revenues:    
Revenues 20.2 21.3
Fixed-price Contract | ECS    
Revenues:    
Revenues 43.3 0.0
Time-and-materials Contract | ECS    
Revenues:    
Revenues 61.4 0.0
Cost-plus-fixed-fee Contract | ECS    
Revenues:    
Revenues $ 63.3 $ 0.0
[1] Corporate expenses primarily consist 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.