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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Intangible Assets        
Balance at beginning of the period     $ 1,561.5  
Additions     1.0  
Amortization $ (21.3) $ (29.3) (47.5) $ (60.2)
Changes in foreign currency exchange rates     (9.3)  
Impairment 81.0   81.0  
Balance at end of the period 1,424.7   1,424.7  
Options        
Intangible Assets        
Balance at beginning of the period     134.1  
Amortization     (4.2)  
Balance at end of the period 129.9   129.9  
North American Equities        
Intangible Assets        
Balance at beginning of the period     935.3  
Additions     1.0  
Amortization     (26.2)  
Changes in foreign currency exchange rates     (2.4)  
Balance at end of the period 907.7   907.7  
Europe and Asia Pacific        
Intangible Assets        
Balance at beginning of the period     352.5  
Amortization     (8.4)  
Changes in foreign currency exchange rates     (6.9)  
Balance at end of the period 337.2   337.2  
Global FX        
Intangible Assets        
Balance at beginning of the period     56.2  
Amortization     (6.4)  
Balance at end of the period 49.8   49.8  
Digital        
Intangible Assets        
Balance at beginning of the period     83.4  
Amortization     (2.3)  
Impairment 81.0   81.0  
Balance at end of the period $ 0.1   $ 0.1