Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

The following tables present revenues, gross profit, operating income and amortization by segment (in millions):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Apex
Revenues	$	596.1	$	644.1	$	1,802.1	$	1,878.7
Gross profit	173.0		192.2		528.1		555.4
Operating income	69.4		79.2		202.3		213.1
Amortization	5.7		4.0		16.5		15.5
Oxford
Revenues	$	127.2	$	152.5	$	396.1	$	455.3
Gross profit	52.1		61.9		157.8		183.3
Operating income	12.1		13.6		31.0		36.3
Amortization	0.2		1.0		0.5		3.0
ECS
Revenues	$	288.6	$	206.1	$	741.0	$	564.7
Gross profit	45.9		37.3		126.8		101.8
Operating income	16.7		12.7		44.3		30.5
Amortization	7.0		6.9		20.6		20.3
Consolidated
Revenues	$	1,011.9	$	1,002.7	$	2,939.2	$	2,898.7
Gross profit	271.0		291.4		812.7		840.5
Operating income(1)	80.9		90.9		227.8		226.9
Amortization	12.9		11.9		37.6		38.8
___________________ (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 following table presents segment revenues by type (in millions):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Apex
Assignment	$	492.2	$	544.7	$	1,502.3	$	1,598.0
Consulting	96.6		85.1		271.5		237.0
Permanent placement	7.3		14.3		28.3		43.7
	596.1		644.1		1,802.1		1,878.7
Oxford
Assignment	$	95.8	$	115.3	$	306.9	$	350.0
Consulting	14.1		15.0		38.4		41.1
Permanent placement	17.3		22.2		50.8		64.2
	127.2		152.5		396.1		455.3
ECS
Firm-fixed-price	$	82.0	$	64.4	$	201.2	$	153.8
Time and materials	80.8		68.4		234.6		200.6
Cost reimbursable	125.8		73.3		305.2		210.3
	288.6		206.1		741.0		564.7
Consolidated	$	1,011.9	$	1,002.7	$	2,939.2	$	2,898.7

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				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Department of Defense and Intelligence Agencies	$	172.0	$	112.6	$	414.4	$	316.2
Federal Civilian	96.2		82.0		276.1		213.5
Other	20.4		11.5		50.5		35.0
	$	288.6	$	206.1	$	741.0	$	564.7