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Subsequent Event (Notes)	12 Months Ended
Subsequent Event (Notes)	Dec. 31, 2019
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Event On January 24, 2020, the Company acquired all of the outstanding equity interests of the federal division of Blackstone Technology Group (“Blackstone Federal”), for $85.0 million in cash. Blackstone Federal is headquartered in Arlington, Virginia. The acquisition expands the Company's capabilities in agile application development, cloud modernization and systems architecture, cybersecurity, user experience design and branding services to government clients. The results of operations of Blackstone Federal, which will be part of the ECS segment, will be included in the consolidated results of the Company the date of its acquisition.