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Basis of Presentation (Details) £ in Millions, shares in Millions, $ in Millions | Mar. 06, 2020 GBP (£) | Mar. 06, 2020 USD ($) | Jun. 12, 2019 USD ($) | Apr. 26, 2019 USD ($) shares
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John Wood Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Enterprise value on debt-free, cash-free basis (USD, GBP) | £ 241 | $ 310.9 |  |
KeyW |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Outstanding shares acquired (as a percent) |  |  | 100.00% |
Consideration transferred |  |  | $ 902.7 |
Consideration paid in cash |  |  | 604.3 |
Debt assumed |  |  | $ 298.4 |
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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