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Segments - Schedule of Reconciliation of Reportable Segment Operating Profit to Net Income (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net income attributable to CBRE Group, Inc.	$ 225.0		$ 191.0	$ 481.0	$ 509.0
Net income attributable to non-controlling interests	20.0		10.0	54.0	23.0
Net income	245.0		201.0	535.0	532.0
Adjustments to increase (decrease) net income:
Depreciation and amortization	178.0		149.0	497.0	465.0
Interest expense, net of interest income	64.0		38.0	163.0	110.0
Provision for income taxes	67.0		31.0	70.0	114.0
Costs associated with efficiency and cost-reduction initiatives	41.0		4.0	137.0	145.0
Charges related to indirect tax audit / settlement	25.0		0.0	39.0	0.0
Carried interest incentive compensation (reversal) expense to align with the timing of associated revenue	(4.0)		(8.0)	12.0	(2.0)
Costs incurred related to legal entity restructuring	0.0		4.0	2.0	4.0
Integration and other costs related to acquisitions	22.0		5.0	30.0	60.0
Provision associated with Telford’s fire safety remediation efforts	33.0		0.0	33.0	0.0
Impact of fair value non-cash adjustments related to unconsolidated equity investments	9.0		0.0	9.0	0.0
Total reportable segment operating profit	$ 368.0		$ 269.0	819.0	613.0
Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration]	Total reportable segment operating profit		Total reportable segment operating profit
Transaction and business realignment costs		$ 18.0
Offset by reversal of over-accrued amount		$ 22.0
Corporate and other loss, including eliminations
Adjustments to increase (decrease) net income:
Total reportable segment operating profit	$ 119.0		$ 111.0	412.0	319.0
Operating Segments
Adjustments to increase (decrease) net income:
Total reportable segment operating profit	$ 799.0		$ 535.0	$ 1,939.0	$ 1,747.0

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