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Basis of Presentation (Details) - USD ($) shares in Millions | Nov. 19, 2021 | Mar. 02, 2021 | Nov. 24, 2020 | Apr. 26, 2019 | Oct. 01, 2021
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Worley Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ordinary shares included in purchase price (in shares) |  |  |  | 58.2 |
Worley |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred |  |  |  | $ 3,400,000,000 |
Consideration paid in cash |  |  |  | $ 2,800,000,000 |
Discontinued Operations | Worley |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assets held for sale |  |  |  |  | $ 0
PA Consulting Employees |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership interest of employees |  | 35.00% |  |  |
BlackLynx |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net assets acquired | $ 236,200,000 |  |  |  |
Consideration paid in cash | 234,900,000 |  |  |  |
Contingent consideration | 1,300,000 |  |  |  |
Debt assumed | $ 5,300,000 |  |  |  |
PA Consulting Group Limited |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred |  | $ 1,700,000,000 |  |  |
Net assets acquired |  | $ 1,701,900,000 |  |  |
Percentage of outstanding shares of common and preferred stock acquired |  | 65.00% |  |  |
Consideration received from acquiree |  | $ 261,000,000 |  |  |
Redeemable Noncontrolling interests |  | $ 582,400,000 |  |  |
Buffalo Group |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred |  |  | $ 190,100,000 |  |
Net assets acquired |  |  | 190,100,000 |  |
Consideration paid in cash |  |  | 182,400,000 |  |
Contingent consideration |  |  | 7,700,000 |  |
Debt assumed |  |  | $ 7,700,000 |  |

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