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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Expense $ 75.3 $ 80.1 $ 47.5  
Stock Options [Member] | U.K. Save As You Earn (SAYE) Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Expense $ 0.0 $ 0.0 $ 0.2  
Number of shares available for grant (in shares) 281,000      
Performance Shares [Member]        
Restricted stock unit activity [Roll Forward]        
Unvested at beginning of period (in shares) 646,000.0 531,500 286,800  
Granted (in shares) 116,500 218,900 276,400  
Vested (in shares) (175,100) (79,000.0) 0  
Forfeited (in shares) (20,400) (25,400) (31,700)  
Unvested at end of period (in shares) 567,000.0 646,000.0 531,500 286,800
Share-based Payment Arrangement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant (in shares) 600,000      
Restricted stock unit activity [Roll Forward]        
Unvested at beginning of period (in shares) 1,558,400 1,627,700 1,819,100  
Granted (in shares) 469,700 554,600 449,500  
Vested (in shares) (570,800) (550,100) (571,100)  
Forfeited (in shares) (49,000.0) (73,800) (69,800)  
Unvested at end of period (in shares) 1,408,300 1,558,400 1,627,700 1,819,100
Restricted stock unit activity, additional disclosures [Abstract]        
Weighted average grant date fair value, beginning of period (in dollars per share) $ 152.27 $ 137.42 $ 141.51  
Weighted average grant date fair value, granted (in dollars per share) 204.05 189.40 124.98  
Weighted average grant date fair value, vested (in dollars per share) 147.78 145.54 137.99  
Weighted average grant date fair value, forfeitures (in dollars per share) 168.92 148.97 136.00  
Weighted average grant date fair value, end of period (in dollars per share) $ 170.78 $ 152.27 $ 137.42 $ 141.51
Weighted average remaining contractual life, unvested shares outstanding and expected to vest 1 year 9 months 14 days 1 year 11 months 26 days 1 year 8 months 8 days 2 years 4 months 20 days
Unamortized deferred compensation cost $ 79.4      
Fair value of shares vested 84.3 $ 80.1 $ 78.8  
Grant date fair value 95.8 105.0 56.2  
Share-based Payment Arrangement [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Expense 26.8 42.4 5.5  
Share-based Payment Arrangement [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Expense $ 48.5 $ 37.7 $ 41.8  
Stock Options [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Discount on purchase price (in hundredths) 15.00%      
Restricted Stock Units (RSUs) [Member]        
Restricted stock unit activity [Roll Forward]        
Unvested at beginning of period (in shares) 912,400 1,096,200 1,532,300  
Granted (in shares) 353,200 335,700 173,100  
Vested (in shares) (395,700) (471,100) (571,100)  
Forfeited (in shares) (28,600) (48,400) (38,100)  
Unvested at end of period (in shares) 841,300 912,400 1,096,200 1,532,300