Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

	Three Months Ended
	March 31,
	2021		2020
Apex
Revenues	$	630.4	$	629.1
Gross profit	182.0		184.5
Operating income	68.5		67.1
Amortization	5.7		5.3
Oxford
Revenues	$	137.5	$	148.7
Gross profit	54.0		59.3
Operating income	11.3		11.1
Amortization	0.1		0.2
ECS
Revenues	$	257.8	$	212.7
Gross profit	45.0		37.1
Operating income	14.8		11.3
Amortization	6.4		6.6
Consolidated
Revenues	$	1,025.7	$	990.5
Gross profit	281.0		280.9
Operating income(1)	74.8		70.9
Amortization	12.2		12.1

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(1)Consolidated operating income includes corporate operating expenses, which 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.

Disaggregation of Revenue

The Company has three major revenue sources: (i) Assignment, (ii) Consulting and (iii) Federal Government. Permanent placement revenues for full year 2020 were approximately 2.6 percent of total revenues and are no longer significant to our consolidated results for disclosure purposes. Consequently, we no longer present these revenues separately in our financial statements and instead they are included in assignment revenues. For comparability, all prior periods have been recast for this change in presentation. The following table presents disaggregated revenues by type (in millions):

	Three Months Ended
	March 31,
	2021		2020
Apex
Assignment	$	512.8	$	539.5
Consulting	117.6		89.6
	630.4		629.1
Oxford
Assignment	117.4		135.5
Consulting	20.1		13.2
	137.5		148.7
ECS
Firm-fixed-price	60.5		57.0
Time and materials	90.7		72.4
Cost reimbursable	106.6		83.3
	257.8		212.7
Consolidated	$	1,025.7	$	990.5

Revenue from External Customers by Products and Services

The following table presents the ECS Segment (federal government business) revenues by customer type (in millions):

	Three Months Ended
	March 31,
	2021		2020
Department of Defense and Intelligence Agencies	$	143.3	$	114.9
Federal Civilian	92.5		84.6
Other	22.0		13.2
	$	257.8	$	212.7