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Description of Business and Basis of Presentation - Basis of Presentation, Acquisition Narrative (Details) - USD ($) shares in Millions, $ in Millions	Jun. 12, 2019	Apr. 26, 2019	Dec. 15, 2017
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, cash acquired	29.1
Business combinatin, short term debt	22.6
Business combination assumed revolving credit facility and second lien notes	$ 275.8
CH2M HILL Companies, Ltd.
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired			100.00%
Business combination consideration paid in cash			$ 1,800.0
Business combination, cash acquired			315.2
Business combination consideration equity issued			$ 1,400.0
Business combination consideration equity issued, shares			20.7
Business combination, Integration related costs		$ 3,400.0
Business combination assumed revolving credit facility and second lien notes			$ 706.0
ECR Business
Business Acquisition [Line Items]
Business combination consideration paid in cash		2,800.0
Business combination consideration equity issued		$ 58.2
Revolving Credit Facility and Second Lien Notes | CH2M HILL Companies, Ltd.
Business Acquisition [Line Items]
Business combinatin, short term debt			20.0
Business combination assumed revolving credit facility and second lien notes			$ 700.0

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