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Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Finite-Lived Intangible Assets, Net $ 677.1  
Indefinite-lived Intangible Assets (Excluding Goodwill) 47.0  
Goodwill [Roll Forward]    
Goodwill 4,587.4 $ 4,528.0
Goodwill Additions, net of adjustments 64.0 18.7
Goodwill, Written off Related to Sale of Business Unit   (0.6)
Goodwill, Foreign Currency Translation Gain (Loss) (40.1) 41.3
Goodwill 4,611.3 4,587.4
Markets Advisory    
Goodwill [Roll Forward]    
Goodwill 1,759.3 1,742.9
Goodwill Additions, net of adjustments 17.7 0.0
Goodwill, Written off Related to Sale of Business Unit   (0.4)
Goodwill, Foreign Currency Translation Gain (Loss) (16.4) 16.8
Goodwill 1,760.6 1,759.3
Capital Markets [Member]    
Goodwill [Roll Forward]    
Goodwill 1,986.4 1,949.2
Goodwill Additions, net of adjustments 3.4 18.7
Goodwill, Written off Related to Sale of Business Unit   (0.2)
Goodwill, Foreign Currency Translation Gain (Loss) (18.3) 18.7
Goodwill 1,971.5 1,986.4
Work Dynamics    
Goodwill [Roll Forward]    
Goodwill 537.7 532.6
Goodwill Additions, net of adjustments 40.5 0.0
Goodwill, Written off Related to Sale of Business Unit   0.0
Goodwill, Foreign Currency Translation Gain (Loss) (5.0) 5.1
Goodwill 573.2 537.7
JLL Technologies    
Goodwill [Roll Forward]    
Goodwill 247.7 247.7
Goodwill Additions, net of adjustments 2.4 0.0
Goodwill, Written off Related to Sale of Business Unit   0.0
Goodwill, Foreign Currency Translation Gain (Loss) 0.0 0.0
Goodwill 250.1 247.7
LaSalle Investment Management [Member]    
Goodwill [Roll Forward]    
Goodwill 56.3 55.6
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) (0.4) 0.7
Goodwill $ 55.9 $ 56.3