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Turner & Townsend Acquisition - Summary of Pro Forma Results Prepared for Comparative Purposes (Details) - Turner & Townsend - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Revenue	$ 28,545,833	$ 24,715,787
Operating income	1,705,982	944,102
Net income attributable to CBRE Group, Inc.	$ 1,873,426	$ 705,375
Basic income per share:
Net income per share attributable to CBRE Group, Inc. (in USD per share)	$ 5.59	$ 2.10
Weighted average shares outstanding for basic income per share (in shares)	335,232,840	335,196,296
Diluted income per share:
Net income per share attributable to CBRE Group, Inc. (in USD per share)	$ 5.51	$ 2.08
Weighted average shares outstanding for diluted income per share (in shares)	339,717,401	338,392,210

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