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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible Assets by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Intangible Assets        
Balance at beginning of the period     $ 1,376.9  
Sales     (0.6)  
Amortization $ (17.2) $ (20.7) (52.8) $ (68.2)
Changes in foreign currency exchange rates     25.7  
Impairment     (18.9)  
Balance at end of the period 1,330.3   1,330.3  
Options        
Intangible Assets        
Balance at beginning of the period     126.4  
Sales     0.0  
Amortization     (4.8)  
Changes in foreign currency exchange rates     0.0  
Impairment     0.0  
Balance at end of the period 121.6   121.6  
North American Equities        
Intangible Assets        
Balance at beginning of the period     879.6  
Sales     (0.6)  
Amortization     (30.0)  
Changes in foreign currency exchange rates     2.2  
Impairment     0.0  
Balance at end of the period 851.2   851.2  
Europe and Asia Pacific        
Intangible Assets        
Balance at beginning of the period     326.7  
Sales     0.0  
Amortization     (10.7)  
Changes in foreign currency exchange rates     23.5  
Impairment     (18.9)  
Balance at end of the period 320.6   320.6  
Global FX        
Intangible Assets        
Balance at beginning of the period     44.2  
Sales     0.0  
Amortization     (7.3)  
Changes in foreign currency exchange rates     0.0  
Impairment     0.0  
Balance at end of the period $ 36.9   $ 36.9