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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Intangible Assets    
Balance at beginning of the period $ 1,561.5  
Amortization (26.2) $ (30.9)
Changes in foreign currency exchange rates (8.6)  
Balance at end of the period 1,526.7  
Options    
Intangible Assets    
Balance at beginning of the period 134.1  
Amortization (2.5)  
Balance at end of the period 131.6  
North American Equities    
Intangible Assets    
Balance at beginning of the period 935.3  
Amortization (13.7)  
Changes in foreign currency exchange rates (1.7)  
Balance at end of the period 919.9  
Europe and Asia Pacific    
Intangible Assets    
Balance at beginning of the period 352.5  
Amortization (4.6)  
Changes in foreign currency exchange rates (6.9)  
Balance at end of the period 341.0  
Global FX    
Intangible Assets    
Balance at beginning of the period 56.2  
Amortization (3.6)  
Balance at end of the period 52.6  
Digital    
Intangible Assets    
Balance at beginning of the period 83.4  
Amortization (1.8)  
Balance at end of the period $ 81.6