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Organization (Details) $ in Millions, ft² in Billions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) ft² employee | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of employees | employee | 98,000 |  |
Number of employees whose costs are reimbursed by clients | employee | 44,500 |  |
Portfolio of property and corporate facility management (in square feet) | ft² | 5.4 |  |
Assets under management by LaSalle Investment Management | $ 76,600.0 |  |
Product Information [Line Items] |  |  |
Revenue: | 19,367.0 | $ 16,589.9 | $ 17,983.2
Real Estate Services: Leasing [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue: | 2,794.0 | 1,884.2 | 2,524.0
Real Estate Services: Capital Markets and Hotels [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue: | 2,193.5 | 1,407.4 | 1,542.2
Real Estate Services: Property & Facilities Management [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue: | 10,222.7 | 9,485.4 | 9,364.7
Real Estate Services: Project & Development Services [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue: | 2,684.9 | 2,530.1 | 3,121.5
Real Estate Services: Advisory, Consulting and Other [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue: | 971.8 | 861.0 | 904.7
LaSalle Investment Management [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue: | $ 500.1 | $ 421.8 | $ 526.1

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