Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2022

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


	Year Ended December 31,
	2022		2021		2020
Commercial
Revenues	$	3,435.7	$	2,927.1	$	2,497.9
Gross profit	1,126.2		934.9		778.3
Operating income	411.1		355.9		284.5
Depreciation	16.3		13.9		14.4
Amortization	31.3		25.7		22.9
Federal Government
Revenues	$	1,145.4	$	1,082.4	$	1,004.2
Gross profit	243.4		207.6		168.9
Operating income	89.1		76.1		58.0
Depreciation	5.5		8.5		9.0
Amortization	33.8		30.0		28.1
Consolidated
Revenues	$	4,581.1	$	4,009.5	$	3,502.1
Gross profit	1,369.6		1,142.4		947.2
Operating income	409.5		350.9		281.2
Depreciation	26.3		28.0		28.3
Amortization	65.1		55.7		51.0

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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,
	2022		2021		2020
Commercial
Assignment	$	2,476.1	$	2,285.9	$	2,117.0
Consulting	959.6		641.2		380.9
	3,435.7		2,927.1		2,497.9
Federal Government
Firm-fixed-price	331.6		295.6		272.0
Time and materials	456.3		399.0		322.6
Cost reimbursable	357.5		387.8		409.6
	1,145.4		1,082.4		1,004.2
Consolidated	$	4,581.1	$	4,009.5	$	3,502.1

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,
	2022		2021		2020
Department of Defense and Intelligence Agencies	$	606.3	$	589.7	$	558.5
Federal Civilian	503.4		421.8		370.6
Other	35.7		70.9		75.1
	$	1,145.4	$	1,082.4	$	1,004.2