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Basis of Presentation (Details) - USD ($) shares in Millions, $ in Millions | Oct. 21, 2018 | Dec. 15, 2017
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ECR Business |  |
Business Acquisition [Line Items] |  |
Consideration transferred | $ 3,300.0 |
Business combination consideration paid in cash | 2,600.0 |
Business combination consideration equity issued | $ 58.2 |
CH2M HILL Companies, Ltd. |  |
Business Acquisition [Line Items] |  |
Business combination consideration paid in cash |  | $ 1,800.0
Business combination, cash acquired |  | 315.2
Business combination consideration equity issued |  | $ 1,400.0
Percentage of outstanding shares of common and preferred stock acquired |  | 100.00%
Business combination consideration equity issued, shares |  | 20.7
Business combination assumed revolving credit facility and second lien notes |  | $ 706.0
Revolving Credit Facility and Second Lien Notes | CH2M HILL Companies, Ltd. |  |
Business Acquisition [Line Items] |  |
Business combination prepayment penalty |  | 20.0
Business combination assumed revolving credit facility and second lien notes |  | $ 700.0

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