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Acquisitions - Narrative (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 01, 2021 USD ($) | Dec. 31, 2023 USD ($) acquisition | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of businesses acquired | acquisition |  | 16 |  |  |
Revenue |  | $ 31,949.0 | $ 30,828.0 | $ 27,746.0 |
Operating income |  | 1,117.0 | 1,512.0 | 1,637.0 |
Net loss |  | 1,277.0 | 1,658.0 | 2,410.0 |
Direct transaction and integration costs |  | 62.0 | $ 40.0 | 44.0 |
Turner & Townsend |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Noncontrolling interest, noncontrolling owners percent | 40.00% |  |  |  |
Turner & Townsend |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and deferred consideration | $ 723.0 |  |  |  |
Equity interest percentage | 60.00% |  |  |  |
Deferred consideration, gross | $ 591.2 |  |  |  |
Deferred consideration, discount | 96.9 |  |  |  |
Goodwill deductible amount | $ 0.0 |  |  |  |
Revenue |  |  |  | 194.0 |
Operating income |  |  |  | 0.5 |
Net loss |  |  |  | (0.5) |
Direct transaction and integration costs |  |  |  | 44.6 |
Noncontrolling interest, fair value calculation, percentage of equity interest used in calculation | 100.00% |  |  |  |
Increased amortization expense |  |  |  | 81.3 | $ 97.5
Increased depreciation expense |  |  |  | $ 5.5 | $ 6.6
Turner & Townsend | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contractual payment date period | 3 years |  |  |  |
Turner & Townsend | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contractual payment date period | 4 years |  |  |  |
Raleigh Joint Venture |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and deferred consideration |  | $ 311.5 |  |  |
Equity interest percentage |  | 50.00% |  |  |

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