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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible Assets by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Intangible Assets        
Balance at beginning of the period     $ 1,376.9  
Sales     (0.3)  
Amortization $ (17.2) $ (21.3) (35.6) $ (47.5)
Changes in foreign currency exchange rates     32.3  
Impairment (17.1) (81.0) (17.1) (81.0)
Balance at end of the period 1,356.2   1,356.2  
Options        
Intangible Assets        
Balance at beginning of the period     126.4  
Sales     0.0  
Amortization     (3.2)  
Changes in foreign currency exchange rates     0.0  
Impairment     0.0  
Balance at end of the period 123.2   123.2  
North American Equities        
Intangible Assets        
Balance at beginning of the period     879.6  
Sales     (0.3)  
Amortization     (20.2)  
Changes in foreign currency exchange rates     3.6  
Impairment     0.0  
Balance at end of the period 862.7   862.7  
Europe and Asia Pacific        
Intangible Assets        
Balance at beginning of the period     326.7  
Sales     0.0  
Amortization     (7.3)  
Changes in foreign currency exchange rates     28.7  
Impairment     (17.1)  
Balance at end of the period 331.0   331.0  
Global FX        
Intangible Assets        
Balance at beginning of the period     44.2  
Sales     0.0  
Amortization     (4.9)  
Changes in foreign currency exchange rates     0.0  
Impairment     0.0  
Balance at end of the period $ 39.3   $ 39.3  
Digital        
Intangible Assets        
Impairment   $ (81.0)   $ (81.0)