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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

X

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Number of persons employed by the Entity

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The number of employees whose costs are reimbursed by clients.

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Area of a real estate property.

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The carrying amount of assets an investment adviser manages on behalf of investors.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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