Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2021

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

Management evaluates the performance of each segment primarily based on revenues, gross profit and operating income derived directly from internal financial reporting of the segments used for corporate management purposes, which is presented below by segment (in millions):


	Year Ended December 31,
	2021		2020		2019
Commercial
Revenues	$	2,927.1	$	2,497.9	$	2,617.4
Gross profit	934.9		778.3		830.4
Operating income	355.9		284.5		297.8
Depreciation	13.9		14.4		14.6
Amortization	25.7		22.9		23.2
Federal Government
Revenues	$	1,082.4	$	1,004.2	$	798.2
Gross profit	207.6		168.9		141.1
Operating income	76.1		58.0		43.4
Depreciation	8.5		9.0		13.3
Amortization	30.0		28.1		27.1
Consolidated
Revenues	$	4,009.5	$	3,502.1	$	3,415.6
Gross profit	1,142.4		947.2		971.5
Operating income	350.9		281.2		276.2
Depreciation	28.0		28.3		28.0
Amortization	55.7		51.0		50.3

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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,
	2021		2020		2019
Commercial
Assignment	$	2,285.9	$	2,117.0	$	2,288.3
Consulting	641.2		380.9		329.1
	2,927.1		2,497.9		2,617.4
Federal Government
Firm-fixed-price	295.6		272.0		214.0
Time and materials	399.0		322.6		267.8
Cost reimbursable	387.8		409.6		316.4
	1,082.4		1,004.2		798.2
Consolidated	$	4,009.5	$	3,502.1	$	3,415.6

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,
	2021		2020		2019
Department of Defense and Intelligence Agencies	$	589.7	$	558.5	$	453.9
Federal Civilian	421.8		370.6		293.6
Other	70.9		75.1		50.7
	$	1,082.4	$	1,004.2	$	798.2