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Segments - Summarized Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 7,411,114	$ 7,332,933
Total reportable segment operating profit	630,886	835,442
Corporate, other and eliminations
Segment Reporting Information [Line Items]
Revenue	(4,322)	(4,888)
Total reportable segment operating profit	124,514	239,743
Advisory Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,853,868	2,248,448
Total reportable segment operating profit	269,722	465,654
Global Workplace Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenue	5,337,722	4,805,616
Total reportable segment operating profit	229,666	202,736
Real Estate Investments | Operating Segments
Segment Reporting Information [Line Items]
Revenue	223,846	283,757
Total reportable segment operating profit	$ 131,498	$ 167,052

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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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