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Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Finite-Lived Intangible Assets, Net $ 735.4  
Indefinite-lived Intangible Assets (Excluding Goodwill) 49.6  
Goodwill [Roll Forward]    
Goodwill 4,528.0 $ 4,611.6
Goodwill Additions, net of adjustments 18.7 13.5
Goodwill, Written off Related to Sale of Business Unit (0.6)  
Goodwill, Foreign Currency Translation Gain (Loss) 41.3 (97.1)
Goodwill 4,587.4 4,528.0
Markets Advisory    
Goodwill [Roll Forward]    
Goodwill 1,742.9 1,782.9
Goodwill Additions, net of adjustments 0.0 0.0
Goodwill, Written off Related to Sale of Business Unit (0.4)  
Goodwill, Foreign Currency Translation Gain (Loss) 16.8 (40.0)
Goodwill 1,759.3 1,742.9
Capital Markets [Member]    
Goodwill [Roll Forward]    
Goodwill 1,949.2 1,983.9
Goodwill Additions, net of adjustments 18.7 8.5
Goodwill, Written off Related to Sale of Business Unit (0.2)  
Goodwill, Foreign Currency Translation Gain (Loss) 18.7 (43.2)
Goodwill 1,986.4 1,949.2
Work Dynamics    
Goodwill [Roll Forward]    
Goodwill 532.6 539.9
Goodwill Additions, net of adjustments 0.0 4.6
Goodwill, Written off Related to Sale of Business Unit 0.0  
Goodwill, Foreign Currency Translation Gain (Loss) 5.1 (11.9)
Goodwill 537.7 532.6
JLL Technologies    
Goodwill [Roll Forward]    
Goodwill 247.7 247.5
Goodwill Additions, net of adjustments 0.0 0.4
Goodwill, Written off Related to Sale of Business Unit 0.0  
Goodwill, Foreign Currency Translation Gain (Loss) 0.0 (0.2)
Goodwill 247.7 247.7
LaSalle Investment Management [Member]    
Goodwill [Roll Forward]    
Goodwill 55.6 57.4
Goodwill Additions, net of adjustments 0.0 0.0
Goodwill, Written off Related to Sale of Business Unit 0.0  
Goodwill, Foreign Currency Translation Gain (Loss) 0.7 (1.8)
Goodwill $ 56.3 $ 55.6