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Cover Document
 6 Months Ended
Jun. 30, 2019
Document Information [Line Items]  
Document Transition Report false
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Small Business false
Title of 12(b) Security Common Stock, par value $0.01
Entity File Number 1-13145
Document Type 10-Q
Entity Incorporation, State or Country Code MD
Entity Tax Identification Number 36-4150422
Entity Address, Address Line One 200 East Randolph Dr,
Entity Address, City or Town Chicago,
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60601
City Area Code (312)
Local Phone Number 782-5800
Trading Symbol JLL
Security Exchange Name NYSE
Entity Shell Company false
Entity Emerging Growth Company false
Document Quarterly Report true