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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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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.

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