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v3.19.1

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.

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