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Basis of Presentation (Details) - USD ($) shares in Millions, $ in Millions	Oct. 21, 2018	Dec. 15, 2017
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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