v3.25.2
Business Combinations, Goodwill by Segment (Details)
$ in Millions
6 Months Ended
Jun. 30, 2025
USD ($)
Goodwill [Roll Forward]  
Goodwill $ 4,611.3
Goodwill Additions, net of adjustments 6.6
Goodwill, Translation Adjustments 97.9
Goodwill 4,715.8
Leasing Advisory  
Goodwill [Roll Forward]  
Goodwill 1,372.6
Goodwill Additions, net of adjustments 0.0
Goodwill, Translation Adjustments 35.4
Goodwill 1,408.0
Capital Markets Services  
Goodwill [Roll Forward]  
Goodwill 1,971.5
Goodwill Additions, net of adjustments 6.6
Goodwill, Translation Adjustments 44.5
Goodwill 2,022.6
Real Estate Management Services  
Goodwill [Roll Forward]  
Goodwill 961.2
Goodwill Additions, net of adjustments 0.0
Goodwill, Translation Adjustments 16.5
Goodwill 977.7
Software and Technology Solutions  
Goodwill [Roll Forward]  
Goodwill 250.1
Goodwill Additions, net of adjustments 0.0
Goodwill, Translation Adjustments (0.1)
Goodwill 250.0
Investment Management  
Goodwill [Roll Forward]  
Goodwill 55.9
Goodwill Additions, net of adjustments 0.0
Goodwill, Translation Adjustments 1.6
Goodwill $ 57.5