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Stock-Based Compensation (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
yr
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense | $ $ 26.9 $ 22.8 $ 20.4
Stock Options [Member] | U.K. Save As You Earn (SAYE) Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant (in shares) 400,000    
Allocated share-based compensation expense | $ $ 1.4 $ 2.1 1.1
Other Stock Compensation Programs [Abstract]      
Options granted (in shares) 0 76,000  
Exercise price - options granted (in dollars per share) | $ / shares $ 0.00 $ 125.50  
Options exercised (in shares) 20,000 82,000  
Weighted average exercise price (in dollars per share) | $ / shares $ 70.37 $ 58.84  
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant (in shares) 550,000    
Sum of age plus years of service, minimum (in years) | yr 65    
Stock Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense | $ $ 25.5 $ 20.7 $ 19.3
Restricted Stock Units (RSUs) [Member]      
Restricted stock unit activity [Roll Forward]      
Unvested at beginning of period (in shares) 706,000 745,300 1,025,300
Granted (in shares) 299,300 186,300 160,500
Vested (in shares) (203,600) (196,400) (426,600)
Forfeited (in shares) (50,800) (29,200) (13,900)
Unvested at end of period (in shares) 750,900 706,000 745,300
Unvested shares expected to vest (in shares) 750,200    
Restricted stock unit activity, additional disclosures [Abstract]      
Weighted average grant date fair value, beginning of period (in dollars per share) | $ / shares $ 111.78 $ 90.43 $ 73.09
Weighted average grant date fair value, granted (in dollars per share) | $ / shares 107.74 159.30 119.88
Weighted average grant date fair value, vested (in dollars per share) | $ / shares 96.37 78.45 60.14
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares 117.48 94.20 80.74
Weighted average grant date fair value, end of period (in dollars per share) | $ / shares 113.97 $ 111.78 $ 90.43
Weighted average grant date fair value, unvested shares expected to vest (in dollars per share) | $ / shares $ 113.99    
Weighted average remaining contractual life, unvested shares outstanding and expected to vest 1 year 8 months 15 days 2 years 10 days 2 years 4 months 18 days
Weighted average remaining contractual life, unvested shares expected to vest 1 year 8 months 15 days    
Unamortized deferred compensation cost | $ $ 29.6    
Fair value of shares vested | $ 19.6 $ 15.4 $ 25.7
Grant date fair value | $ $ 32.2 $ 29.7 $ 19.2
Stock Options [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]      
Other Stock Compensation Programs [Abstract]      
Discount on purchase price (in hundredths) 15.00%    
Options outstanding (in shares) 128,000 156,000  
Stock Options [Member] | Three year vesting [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]      
Other Stock Compensation Programs [Abstract]      
Options to purchase discounted stock, vesting period (in years) 3 years    
Stock Options [Member] | Five year vesting [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]      
Other Stock Compensation Programs [Abstract]      
Options to purchase discounted stock, vesting period (in years) 5 years