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Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

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

Segment information is as follows (in millions):

						Year Ended December 31, 2024
						Commercial						Federal Government						Total
Revenues
Consulting						$	1,128.2					$	1,231.0					$	2,359.2
Assignment						1,740.5						—						1,740.5
						2,868.7						$	1,231.0					4,099.7
Costs of services						1,935.8						980.2						2,916.0
Gross profit						932.9						250.8						1,183.7
Segment depreciation and other amortization						29.6						5.0						34.6
Other segment expenses						588.3						121.0						709.3
Segment SG&A expenses						617.9						126.0						743.9
Amortization of intangible assets						28.5						29.6						58.1
Segment operating income						286.5						95.2						381.7
Corporate SG&A expenses																		77.3
Operating income																		304.4
Interest expense, net																		64.3
Income before taxes																		$	240.1

						Year Ended December 31, 2023
						Commercial						Federal Government						Total
Revenues
Consulting						$	1,095.5					$	1,276.2					$	2,371.7
Assignment						2,078.9						—						2,078.9
						3,174.4						1,276.2						4,450.6
Costs of services						2,156.8						1,013.8						3,170.6
Gross profit						1,017.6						262.4						1,280.0
Segment depreciation and other amortization						20.3						4.3						24.6
Other segment expenses						618.4						122.0						740.4
Segment SG&A expenses						638.7						126.3						765.0
Amortization of intangible assets						34.8						36.9						71.7
Segment operating income						344.1						99.2						443.3
Corporate SG&A expenses																		79.2
Operating income																		364.1
Interest expense, net																		66.4
Income before taxes																		$	297.7

						Year Ended December 31, 2022
						Commercial						Federal Government						Total
Revenues
Consulting						$	959.6					$	1,145.4					$	2,105.0
Assignment						2,476.1						—						2,476.1
						3,435.7						1,145.4						4,581.1
Costs of services						2,309.5						902.0						3,211.5
Gross profit						1,126.2						243.4						1,369.6
Segment depreciation and other amortization						16.4						4.5						20.9
Other segment expenses						667.4						116.0						783.4
Segment SG&A expenses						683.8						120.5						804.3
Amortization of intangible assets						31.3						33.8						65.1
Segment operating income						411.1						89.1						500.2
Corporate SG&A expenses																		90.7
Operating income																		409.5
Interest expense, net																		45.9
Income before taxes																		$	363.6

______

Disaggregation of Revenue [Table Text Block]

						Year Ended December 31,
						2024						2023						2022
FFP						$	367.7					$	386.7					$	331.6
T&M						522.0						504.9						456.3
Cost reimbursable						341.3						384.6						357.5
						1,231.0						1,276.2						1,145.4

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,
						2024						2023						2022
Department of Defense and Intelligence Agencies						$	560.1					$	614.6					$	606.3
Federal Civilian						627.4						621.6						503.4
Other						43.5						40.0						35.7
						$	1,231.0					$	1,276.2					$	1,145.4

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

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-Topic 606
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-Name Accounting Standards Codification
-Section 50
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Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.

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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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