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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Expense $ 80.1 $ 47.5 $ 76.4  
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 $ 0.2 $ 1.2  
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) 531,500 286,800 93,100  
Granted (in shares) 218,900 276,400 196,500  
Vested (in shares) (79,000.0) 0 0  
Forfeited (in shares) (25,400) (31,700) (2,800)  
Unvested at end of period (in shares) 646,000.0 531,500 286,800 93,100
Share-based Payment Arrangement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant (in shares) 1,100,000      
Restricted stock unit activity [Roll Forward]        
Unvested at beginning of period (in shares) 1,627,700 1,819,100 652,700  
Granted (in shares) 554,600 449,500 1,494,500  
Vested (in shares) (550,100) (571,100) (287,700)  
Forfeited (in shares) (73,800) (69,800) (40,400)  
Unvested at end of period (in shares) 1,558,400 1,627,700 1,819,100 652,700
Restricted stock unit activity, additional disclosures [Abstract]        
Weighted average grant date fair value, beginning of period (in dollars per share) $ 137.42 $ 141.51 $ 131.32  
Weighted average grant date fair value, granted (in dollars per share) 189.40 124.98 141.06  
Weighted average grant date fair value, vested (in dollars per share) 145.54 137.99 116.32  
Weighted average grant date fair value, forfeitures (in dollars per share) 148.97 136.00 137.49  
Weighted average grant date fair value, end of period (in dollars per share) $ 152.27 $ 137.42 $ 141.51 $ 131.32
Weighted average remaining contractual life, unvested shares outstanding and expected to vest 1 year 11 months 26 days 1 year 8 months 8 days 2 years 4 months 20 days 2 years 7 days
Unamortized deferred compensation cost $ 101.8      
Fair value of shares vested 80.1 $ 78.8 $ 33.5  
Grant date fair value 105.0 56.2 210.8  
Share-based Payment Arrangement [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Expense 42.4 5.5 13.6  
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 $ 37.7 $ 41.8 $ 61.6  
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) 1,096,200 1,532,300 559,600  
Granted (in shares) 335,700 173,100 1,298,000  
Vested (in shares) (471,100) (571,100) (287,700)  
Forfeited (in shares) (48,400) (38,100) (37,600)  
Unvested at end of period (in shares) 912,400 1,096,200 1,532,300 559,600
Vesting Period One [Member] | Stock Options [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Vesting Period Two [Member] | Stock Options [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
HFF Acquisition [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Granted to Employees in Conjunction with Acquisition     1,111,300  
HFF Acquisition [Member] | Share-based Payment Arrangement [Member]        
Restricted stock unit activity, additional disclosures [Abstract]        
Unamortized deferred compensation cost $ 9.0