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Acquisitions - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Jan. 16, 2025 | Jan. 01, 2025
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Project Management | Turner & Townsend |  |  |
Business Acquisition [Line Items] |  |  |
Equity method investments in unconsolidated subsidiaries, variations in ownership percentage |  |  | 70.00%
Industrious |  |  |
Business Acquisition [Line Items] |  |  |
Equity interest percentage |  | 60.00% |
Goodwill deductible amount | $ 395 |  |
Industrious | Building Operations & Experience |  |  |
Business Acquisition [Line Items] |  |  |
Equity interest percentage |  | 100.00% |
Turner & Townsend | Project Management |  |  |
Business Acquisition [Line Items] |  |  |
Equity interest percentage |  |  | 10.00%
Estimated based on discounted forecasted cash flows | $ 371 |  |

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