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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2016
Feb. 20, 2017
Jul. 01, 2016
Document and Entity Information [Abstract]      
Entity Registrant Name JONES LANG LASALLE INC    
Entity Central Index Key 0001037976    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 4,302,579,297
Entity Common Stock, Shares Outstanding   45,248,135  
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus Q4    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2016