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v3.20.1

Segment Reporting (Segment Reporting Information) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenues: |  |  |
Revenues |  | $ 990.5 | $ 923.7
Gross Profit: |  |  |
Total Gross Profit |  | 280.9 | 263.9
Operating Income (Loss): |  |  |
Total Operating Income |  | 70.9 | 62.7
Amortization of Intangible Assets |  | 12.1 | 13.8
Apex |  |  |
Revenues: |  |  |
Revenues |  | 629.1 | 606.1
Gross Profit: |  |  |
Total Gross Profit |  | 184.5 | 175.4
Operating Income (Loss): |  |  |
Total Operating Income |  | 67.1 | 61.0
Amortization of Intangible Assets |  | 5.3 | 6.0
Oxford |  |  |
Revenues: |  |  |
Revenues |  | 148.7 | 149.6
Gross Profit: |  |  |
Total Gross Profit |  | 59.3 | 58.9
Operating Income (Loss): |  |  |
Total Operating Income |  | 11.1 | 11.7
Amortization of Intangible Assets |  | 0.2 | 1.0
ECS |  |  |
Revenues: |  |  |
Revenues |  | 212.7 | 168.0
Gross Profit: |  |  |
Total Gross Profit |  | 37.1 | 29.6
Operating Income (Loss): |  |  |
Total Operating Income |  | 11.3 | 6.9
Amortization of Intangible Assets |  | 6.6 | 6.8
Corporate |  |  |
Operating Income (Loss): |  |  |
Total Operating Income | [1] | (18.6) | (16.9)
Assignment | Apex |  |  |
Revenues: |  |  |
Revenues |  | 615.9 | 592.2
Assignment | Oxford |  |  |
Revenues: |  |  |
Revenues |  | 128.1 | 129.4
Permanent Placement | Apex |  |  |
Revenues: |  |  |
Revenues |  | 13.2 | 13.9
Permanent Placement | Oxford |  |  |
Revenues: |  |  |
Revenues |  | 20.6 | 20.2
Fixed-price Contract | ECS |  |  |
Revenues: |  |  |
Revenues |  | 57.0 | 43.3
Time and materials Contract | ECS |  |  |
Revenues: |  |  |
Revenues |  | 72.4 | 61.4
Cost-plus-fixed-fee Contract | ECS |  |  |
Revenues: |  |  |
Revenues |  | $ 83.3 | $ 63.3
[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.

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