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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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