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Organization (Details) $ in Millions, ft² in Billions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) ft² employee | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) ft² employee | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of employees | employee | 90,000 |  |  |  |  |  |  |  | 90,000 |  |
Number of employees whose costs are reimbursed by clients | employee | 42,200 |  |  |  |  |  |  |  | 42,200 |  |
Portfolio of property and corporate facility management (in square feet) | ft² | 4.6 |  |  |  |  |  |  |  | 4.6 |  |
Assets under management by LaSalle Investment Management | $ 60,500.0 |  |  |  |  |  |  |  | $ 60,500.0 |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue: | $ 4,889.7 | $ 3,969.8 | $ 3,903.7 | $ 3,555.2 | $ 4,343.0 | $ 3,522.2 | $ 3,470.3 | $ 3,117.7 | 16,318.4 | $ 14,453.2 | $ 12,991.2
Real Estate Services: Leasing [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  | 2,372.1 | 2,051.9 | 1,798.4
Real Estate Services: Capital Markets and Hotels [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  | 1,145.4 | 1,149.4 | 980.1
Real Estate Services: Property & Facilities Management [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  | 8,782.8 | 7,821.3 | 7,136.5
Real Estate Services: Project & Development Services [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  | 2,669.0 | 2,344.5 | 2,070.3
Real Estate Services: Advisory, Consulting and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  | 815.2 | 730.3 | 597.8
LaSalle Investment Management [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  | $ 533.9 | $ 355.8 | $ 408.1

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