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Basis of Presentation (Details) - USD ($) $ in Millions | Jun. 12, 2019 | Apr. 26, 2019
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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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