v3.25.2
Acquisitions - Schedule of Pro Forma Information (Details) - Christie's International Real Estate - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Business Combination [Line Items]      
Revenue, actuals $ 274.2    
Net income (loss), actuals $ 10.0    
Revenue, pro forma   $ 3,424.0 $ 3,001.9
Net income (loss), pro forma   $ (17.0) $ (117.9)