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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, 2023
Mar. 31, 2022
Intangible Assets    
Balance at beginning of the period $ 1,662.8  
Dispositions (0.8)  
Amortization (30.9) $ (30.6)
Changes in foreign currency exchange rates 5.4  
Balance at end of the period 1,636.5  
Options    
Intangible Assets    
Balance at beginning of the period 146.1  
Amortization (3.1)  
Balance at end of the period 143.0  
North American Equities    
Intangible Assets    
Balance at beginning of the period 992.8  
Amortization (15.5)  
Changes in foreign currency exchange rates 0.1  
Balance at end of the period 977.4  
Europe and Asia Pacific    
Intangible Assets    
Balance at beginning of the period 359.9  
Amortization (6.1)  
Changes in foreign currency exchange rates 5.3  
Balance at end of the period 359.1  
Global FX    
Intangible Assets    
Balance at beginning of the period 72.8  
Amortization (4.5)  
Balance at end of the period 68.3  
Digital    
Intangible Assets    
Balance at beginning of the period 91.2  
Dispositions (0.8)  
Amortization (1.7)  
Balance at end of the period $ 88.7