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Basis of Presentation (Details) - USD ($) $ in Millions	Jun. 12, 2019	Apr. 26, 2019
KeyW Holding Corporation
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired	100.00%
Consideration transferred	$ 902.6
Business combination consideration paid in cash	604.2
Business combination prepayment penalty	$ 298.4
ECR Business
Business Acquisition [Line Items]
Business combination consideration paid in cash		$ 2,800.0
Business combination consideration equity issued		58.2
CH2M HILL Companies, Ltd.
Business Acquisition [Line Items]
Integration related activities		$ 3,400.0

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