v3.26.1
Document and Entity Information
 6 Months Ended
Jun. 30, 2026
numberOfReportableSegments
shares
Document and Entity Information [Abstract]  
Title of 12(b) Security Common Stock, par value $0.01
Trading Symbol JLL
Security Exchange Name NYSE
Entity Incorporation, State or Country Code MD
Entity Tax Identification Number 36-4150422
Entity Address, Address Line One 200 East Randolph Drive
Entity Address, City or Town Chicago,
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60601
Entity File Number 1-13145
City Area Code (312)
Local Phone Number 782-5800
Document Quarterly Report true
Document Transition Report false
Entity Registrant Name Jones Lang LaSalle Incorporated
Entity Central Index Key 0001037976
Current Fiscal Year End Date --12-31
Entity Shell Company false
Entity Emerging Growth Company false
Entity Small Business false
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding | shares 46,007,703
Document Fiscal Year Focus 2026
Document Fiscal Period Focus Q2
Document Period End Date Jun. 30, 2026
Document Type 10-Q
Amendment Flag false
Number of Reportable Segments | numberOfReportableSegments 4