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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
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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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