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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from External Customer [Line Items] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Apex |  |  |  |  |  |
Revenues |  | $ | 2,421.2 |  |  | $ | 2,520.0 |  |  | $ | 2,300.3 |
Gross profit |  | 710.8 |  |  | 746.0 |  |  | 687.9 |
Operating income |  | 276.6 |  |  | 287.7 |  |  | 262.4 |
Amortization |  | 22.9 |  |  | 20.3 |  |  | 26.2 |
Oxford |  |  |  |  |  |
Revenues |  | $ | 525.2 |  |  | $ | 605.7 |  |  | $ | 606.5 |
Gross profit |  | 209.6 |  |  | 242.9 |  |  | 248.9 |
Operating income |  | 43.9 |  |  | 48.4 |  |  | 54.1 |
Amortization |  | 0.7 |  |  | 3.7 |  |  | 4.2 |
ECS |  |  |  |  |  |
Revenues |  | $ | 1,004.2 |  |  | $ | 798.2 |  |  | $ | 493.0 |
Gross profit |  | 168.9 |  |  | 141.1 |  |  | 86.9 |
Operating income |  | 58.0 |  |  | 42.2 |  |  | 15.5 |
Amortization |  | 28.1 |  |  | 27.1 |  |  | 28.1 |
Consolidated |  |  |  |  |  |
Revenues |  | $ | 3,950.6 |  |  | $ | 3,923.9 |  |  | $ | 3,399.8 |
Gross profit |  | 1,089.3 |  |  | 1,130.0 |  |  | 1,023.7 |
Operating income(1) |  | 310.4 |  |  | 308.6 |  |  | 260.2 |
Amortization |  | 51.7 |  |  | 51.1 |  |  | 58.5 |
___________________ (1) Consolidated operating income includes corporate operating expenses that are not allocated to the segments, 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.
Revenue from External Customers by Geographic Areas [Table Text Block] | The Company operates internationally, with operations in Europe, Canada and Mexico. Most of the Company's revenues are generated in the United States. Revenues from outside the United States accounted for less than 5.0 percent of consolidated revenues for 2020, 2019 and 2018. The following table presents revenues by geographic location (in millions):
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Domestic |  | $ | 3,778.1 |  |  | $ | 3,749.2 |  |  | $ | 3,241.8 |
Foreign |  | 172.5 |  |  | 174.7 |  |  | 158.0 |
|  | $ | 3,950.6 |  |  | $ | 3,923.9 |  |  | $ | 3,399.8 |
Long-lived Assets by Geographic Areas [Table Text Block] | The following table presents long-lived assets by geographic location (in millions):
|  | December 31,
|  | 2020 |  | 2019
Domestic |  | $ | 67.6 |  |  | $ | 71.4 |
Foreign |  | 1.8 |  |  | 2.3 |
|  | $ | 69.4 |  |  | $ | 73.7 |
Disaggregation of Revenue [Table Text Block] | The following table presents disaggregated revenues by type (in millions):
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Apex |  |  |  |  |  |
Assignment |  | $ | 2,040.3 |  |  | $ | 2,190.9 |  |  | $ | 2,050.1 |
Consulting |  | 380.9 |  |  | 329.1 |  |  | 250.2 |
|  | 2,421.2 |  |  | 2,520.0 |  |  | 2,300.3 |
Oxford |  |  |  |  |  |
Assignment |  | 468.6 |  |  | 549.4 |  |  | 558.1 |
Consulting |  | 56.6 |  |  | 56.3 |  |  | 48.4 |
|  | 525.2 |  |  | 605.7 |  |  | 606.5 |
ECS |  |  |  |  |  |
Firm-fixed-price |  | 272.0 |  |  | 214.0 |  |  | 133.1 |
Time and materials |  | 322.6 |  |  | 267.8 |  |  | 143.4 |
Cost reimbursable |  | 409.6 |  |  | 316.4 |  |  | 216.5 |
|  | 1,004.2 |  |  | 798.2 |  |  | 493.0 |
Consolidated |  | $ | 3,950.6 |  |  | $ | 3,923.9 |  |  | $ | 3,399.8 |
ECS |
Revenue from External Customer [Line Items] |
Revenue from External Customers by Products and Services [Table Text Block] | The following table presents the ECS segment revenues by customer type (in millions):
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Department of Defense and Intelligence Agencies |  | $ | 558.5 |  |  | $ | 453.9 |  |  | $ | 311.0 |
Federal Civilian |  | 370.6 |  |  | 293.6 |  |  | 150.9 |
Other |  | 75.1 |  |  | 50.7 |  |  | 31.1 |
|  | $ | 1,004.2 |  |  | $ | 798.2 |  |  | $ | 493.0 |

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