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Segment Reporting (Tables)
9 Months Ended
Sep. 30, 2021
Segment Reporting Information [Line Items]  
Schedule of Segment Reporting Information, by Segment
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Commercial
Revenues$774.9 $615.8 $2,136.7 $1,860.7 
Gross profit251.1 190.4 678.1 579.6 
Operating income98.5 72.7 258.8 207.6 
Depreciation3.5 3.7 10.4 10.9 
Amortization7.3 5.7 18.6 16.5 
Federal Government
Revenues$298.9 $288.6 $819.0 $741.0 
Gross profit57.6 45.9 150.6 126.8 
Operating income23.3 16.7 56.8 44.3 
Depreciation2.3 2.5 6.8 6.5 
Amortization8.6 7.0 21.3 20.6 
Consolidated
Revenues$1,073.8 $904.4 $2,955.7 $2,601.7 
Gross profit308.7 236.3 828.7 706.4 
Operating income100.1 73.5 255.4 207.3 
Depreciation7.1 7.5 21.7 20.7 
Amortization15.9 12.7 39.9 37.1 
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Consolidated operating income includes corporate operating expenses, which are not allocated to the segments. These expenses include, among other things, stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses and public company expenses. Consolidated depreciation includes depreciation expense for corporate assets.
Disaggregation of Revenue
Virtually all of the revenues from the Commercial Segment are generated from time-and-materials ("T&M") contracts where payments are based on fixed hourly rates for each direct labor hour expended and reimbursements for allowable material costs and out-of-pocket expenses. Revenues from the Federal Government Segment are generated from: (i) firm-fixed-price, (ii) T&M and (iii) cost reimbursable contracts. Virtually all of the Company's revenues are recognized over time. The following table presents revenues by segment and type (in millions).

Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Commercial
Assignment$587.3 $519.2 $1,687.2 $1,589.2 
Consulting187.6 96.6 449.5 271.5 
774.9 615.8 2,136.7 1,860.7 
Federal Government
Firm-fixed-price94.5 82.0 217.0 201.2 
Time and materials106.0 80.8 296.9 234.6 
Cost reimbursable98.4 125.8 305.1 305.2 
298.9 288.6 819.0 741.0 
Consolidated$1,073.8 $904.4 $2,955.7 $2,601.7 
Revenue from External Customers by Products and Services
The following table presents the Federal Government Segment revenues by customer type (in millions).
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Department of Defense and Intelligence Agencies$166.0 $172.0 $450.8 $414.4 
Federal Civilian112.1 96.2 303.5 276.1 
Other20.8 20.4 64.7 50.5 
$298.9 $288.6 $819.0 $741.0