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Document and Entity Information Document
Sep. 30, 2019
Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Sep. 30, 2019
Entity Registrant Name Jones Lang LaSalle Incorporated
Entity Central Index Key 0001037976
Amendment Flag false
Entity Incorporation, State or 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
Entity Emerging Growth Company false
Common Class A [Member]  
Entity Information [Line Items]  
Title of 12(b) Security Common Stock, par value $0.01
NEW YORK STOCK EXCHANGE, INC. [Member] | Common Class A [Member]  
Entity Information [Line Items]  
Trading Symbol JLL
Security Exchange Name NYSE