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v3.25.3

Acquisitions - Narrative (Details) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 16, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) acquisition | Sep. 30, 2025 USD ($) business | Jan. 01, 2025
Business Combination [Line Items] |  |  |  |  |
Number of businesses acquired |  |  | 2 | 1 |
Advisory Services |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Number of businesses acquired | business |  |  |  | 1 |
Project Management | Turner & Townsend |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Equity method investments in unconsolidated subsidiaries, variations in ownership percentage |  |  |  |  | 70.00%
Industrious |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Equity interest percentage | 60.00% |  |  |  |
Goodwill deductible amount |  | $ 392 | $ 392 | $ 392 |
Cash and deferred consideration | $ 369 |  |  |  |
Industrious | Global Workplace Solutions |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Equity interest percentage | 100.00% |  |  |  |
Turner & Townsend | Project Management |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Equity interest percentage |  |  |  |  | 10.00%
Estimated based on discounted forecasted cash flows |  | 409 | $ 409 | $ 409 |
Other Acquisitions |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Cash and deferred consideration |  | $ 31 |  |  |

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