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Employee Benefit Plans - Bonuses Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Defined benefit plan	$ 871.7	$ 557.6	$ 554.6

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

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- References

No definition available.

+ Details

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