v3.25.2
Acquisitions - Schedule of Fair Value of Identified Intangible Assets And Useful Lives at the Time of Acquisition (Details) - Christie's International Real Estate
$ in Millions
 6 Months Ended
Jun. 30, 2025
USD ($)
Business Combination [Line Items]  
Amount $ 164.1
Trademarks  
Business Combination [Line Items]  
Amount $ 20.3
Trademarks | Minimum  
Business Combination [Line Items]  
Useful Life (in years) 2 years
Trademarks | Maximum  
Business Combination [Line Items]  
Useful Life (in years) 6 years
Acquired technology  
Business Combination [Line Items]  
Amount $ 29.2
Useful Life (in years) 2 years
Agent networks  
Business Combination [Line Items]  
Amount $ 72.3
Useful Life (in years) 7 years
Affiliate network  
Business Combination [Line Items]  
Amount $ 42.3
Useful Life (in years) 6 years