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Document and Entity Information
Jun. 22, 2020
Cover [Abstract]  
Entity Registrant Name JONES LANG LASALLE INC
Amendment Flag false
Entity Central Index Key 0001037976
Document Type 8-K
Document Period End Date Jun. 22, 2020
Entity Incorporation State Country Code MD
Entity File Number 001-13145
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
City Area Code 312
Local Phone Number 782-5800
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.01
Trading Symbol JLL
Security Exchange Name NYSE
Entity Emerging Growth Company false