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Employee Benefit Plans - Bonuses Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Defined benefit plan	$ 696.6	$ 843.1	$ 871.7

X

- Definition

Bonus expense paid to employees of the reporting entity during the period.

+ References

No definition available.

+ Details

Name:	cbre_BonusExpense
Namespace Prefix:	cbre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration