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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2021
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | Management evaluates the performance of each segment primarily based on revenues, gross profit and operating income derived directly from internal financial reporting of the segments used for corporate management purposes, which is presented below by segment (in millions):
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Commercial |  |  |  |  |  |
Revenues |  | $ | 2,927.1 |  |  | $ | 2,497.9 |  |  | $ | 2,617.4 |
Gross profit |  | 934.9 |  |  | 778.3 |  |  | 830.4 |
Operating income |  | 355.9 |  |  | 284.5 |  |  | 297.8 |
Depreciation |  | 13.9 |  |  | 14.4 |  |  | 14.6 |
Amortization |  | 25.7 |  |  | 22.9 |  |  | 23.2 |
Federal Government |  |  |  |  |  |
Revenues |  | $ | 1,082.4 |  |  | $ | 1,004.2 |  |  | $ | 798.2 |
Gross profit |  | 207.6 |  |  | 168.9 |  |  | 141.1 |
Operating income |  | 76.1 |  |  | 58.0 |  |  | 43.4 |
Depreciation |  | 8.5 |  |  | 9.0 |  |  | 13.3 |
Amortization |  | 30.0 |  |  | 28.1 |  |  | 27.1 |
Consolidated |  |  |  |  |  |
Revenues |  | $ | 4,009.5 |  |  | $ | 3,502.1 |  |  | $ | 3,415.6 |
Gross profit |  | 1,142.4 |  |  | 947.2 |  |  | 971.5 |
Operating income |  | 350.9 |  |  | 281.2 |  |  | 276.2 |
Depreciation |  | 28.0 |  |  | 28.3 |  |  | 28.0 |
Amortization |  | 55.7 |  |  | 51.0 |  |  | 50.3 |
___________________ Consolidated operating income includes corporate operating expenses, which are not allocated to the segments. These include stock-based compensation expense, depreciation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses and public company expenses.
Disaggregation of Revenue [Table Text Block] | Revenues by segment and by type are as follows (in millions):
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Commercial |  |  |  |  |  |
Assignment |  | $ | 2,285.9 |  |  | $ | 2,117.0 |  |  | $ | 2,288.3 |
Consulting |  | 641.2 |  |  | 380.9 |  |  | 329.1 |
|  | 2,927.1 |  |  | 2,497.9 |  |  | 2,617.4 |
Federal Government |  |  |  |  |  |
Firm-fixed-price |  | 295.6 |  |  | 272.0 |  |  | 214.0 |
Time and materials |  | 399.0 |  |  | 322.6 |  |  | 267.8 |
Cost reimbursable |  | 387.8 |  |  | 409.6 |  |  | 316.4 |
|  | 1,082.4 |  |  | 1,004.2 |  |  | 798.2 |
Consolidated |  | $ | 4,009.5 |  |  | $ | 3,502.1 |  |  | $ | 3,415.6 |
Revenue from External Customers by Products and Services [Table Text Block] | Federal Government Segment revenues by customer type are as follows (in millions):
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Department of Defense and Intelligence Agencies |  | $ | 589.7 |  |  | $ | 558.5 |  |  | $ | 453.9 |
Federal Civilian |  | 421.8 |  |  | 370.6 |  |  | 293.6 |
Other |  | 70.9 |  |  | 75.1 |  |  | 50.7 |
|  | $ | 1,082.4 |  |  | $ | 1,004.2 |  |  | $ | 798.2 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 + Details
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