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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
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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, 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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