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Organization (Details) $ in Millions, ft² in Billions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) ft² employee | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of employees | employee | 81,904 |  |
Number of employees whose costs are reimbursed by clients | employee | 39,583 |  |
Portfolio of property and corporate facility management (in square feet) | ft² | 4.6 |  |
Assets under management by LaSalle Investment Management | $ 58,100.0 |  |
Product Information [Line Items] |  |  |
Revenue | 7,932.4 | $ 6,803.8 | $ 5,965.7
Real Estate Services: Leasing [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue | 2,023.3 | 1,759.2 | 1,669.2
Real Estate Services: Capital Markets and Hotels [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue | 1,138.7 | 972.1 | 956.9
Real Estate Services: Property & Facilities Management [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue | 2,381.9 | 1,902.5 | 1,550.6
Real Estate Services: Project & Development Services [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue | 1,348.7 | 1,195.2 | 882.1
Real Estate Services: Advisory, Consulting and Other [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue | 684.5 | 567.0 | 509.9
LaSalle Investment Management [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue | $ 355.3 | $ 407.8 | $ 397.0

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