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Segments - Summarized Financial Information by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 7,868,046 | $ 7,529,546 | $ 22,999,025 | $ 22,633,757
Total reportable segment operating profit | 535,109 | 702,666 | 1,747,250 | 2,551,579
Operating Segments | Advisory Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 2,012,833 | 2,433,801 | 5,908,375 | 7,270,232
Total reportable segment operating profit | 277,225 | 423,802 | 862,400 | 1,410,113
Operating Segments | Global Workplace Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 5,648,687 | 4,843,739 | 16,412,471 | 14,557,500
Total reportable segment operating profit | 251,269 | 219,406 | 713,606 | 640,438
Operating Segments | Real Estate Investments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 210,375 | 257,738 | 689,879 | 818,776
Total reportable segment operating profit | 6,615 | 59,458 | 171,244 | 501,028
Corporate, other and eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (3,849) | (5,732) | (11,700) | (12,751)
Total reportable segment operating profit | $ 111,084 | $ (85,192) | $ 319,631 | $ 303,049

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- Definition Adjusted EBITDA represents earnings before net interest expense, write-off of financing costs on extinguished debt, income taxes, depreciation and amortization, and is further adjusted for the impact of certain cash and non-cash charges related to acquisitions, cost-elimination expenses and certain carried interest incentive compensation (reversal) expense to align with the timing of associated revenue. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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