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Basis of Presentation (Details) £ in Millions, shares in Millions, $ in Millions	Nov. 24, 2020 USD ($)	Mar. 06, 2020 USD ($)	Mar. 06, 2020 GBP (£)	Apr. 26, 2019 USD ($) shares
Buffalo Group
Business Acquisition [Line Items]
Consideration transferred	$ 212.8
Consideration paid in cash	181.4
Debt assumed	7.7
Other assumed liabilities	23.7
Cash and cash equivalents	$ 8.4
John Wood Group
Business Acquisition [Line Items]
Enterprise value on debt-free, cash-free basis (USD, GBP)		$ 317.9	£ 246
Cash and cash equivalents		$ 24.3
CH2M HILL Companies, Ltd. | Worley
Business Acquisition [Line Items]
Consideration paid in cash				$ 2,800.0
Purchase price				$ 3,400.0
Consideration paid in shares (in shares) | shares				58.2

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