Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2023

Schedule of Segment Reporting Information, by Segment [Table Text Block]


	Year Ended December 31,
	2023		2022		2021
Commercial
Revenues	$	3,174.4	$	3,435.7	$	2,927.1
Gross profit	1,017.6		1,126.2		934.9
Operating income	344.1		411.1		355.9
Depreciation and other amortization	20.3		16.3		13.9
Amortization of intangible assets	34.8		31.3		25.7
Federal Government
Revenues	$	1,276.2	$	1,145.4	$	1,082.4
Gross profit	262.4		243.4		207.6
Operating income	99.2		89.1		76.1
Depreciation and other amortization	5.7		5.5		8.5
Amortization of intangibles assets	36.9		33.8		30.0
Consolidated
Revenues	$	4,450.6	$	4,581.1	$	4,009.5
Gross profit	1,280.0		1,369.6		1,142.4
Operating income	364.1		409.5		350.9
Depreciation and other amortization	28.6		26.3		28.0
Amortization of intangible assets	71.7		65.1		55.7

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Depreciation and other amortization includes $0.7 million amortization related to capitalized cloud-based application implementation costs.

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,
	2023		2022		2021
Commercial
Assignment	$	2,078.9	$	2,476.1	$	2,285.9
Consulting	1,095.5		959.6		641.2
	3,174.4		3,435.7		2,927.1
Federal Government
Firm-fixed-price	386.7		331.6		295.6
Time and materials	504.9		456.3		399.0
Cost reimbursable	384.6		357.5		387.8
	1,276.2		1,145.4		1,082.4
Consolidated	$	4,450.6	$	4,581.1	$	4,009.5

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,
	2023		2022		2021
Department of Defense and Intelligence Agencies	$	614.6	$	606.3	$	589.7
Federal Civilian	621.6		503.4		421.8
Other	40.0		35.7		70.9
	$	1,276.2	$	1,145.4	$	1,082.4