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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