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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, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Intangible Assets          
Balance at beginning of the period       $ 1,561.5  
Additions       1.0  
Sales       (0.1)  
Amortization $ (20.7)   $ (28.2) (68.2) $ (88.4)
Changes in foreign currency exchange rates       11.5  
Impairment 0.0   $ 0.0 (81.0) $ 0.0
Balance at end of the period 1,424.7     1,424.7  
Options          
Intangible Assets          
Balance at beginning of the period       134.1  
Additions       0.0  
Amortization       (6.0)  
Changes in foreign currency exchange rates       0.0  
Impairment       0.0  
Balance at end of the period 128.1     128.1  
North American Equities          
Intangible Assets          
Balance at beginning of the period       935.3  
Additions       1.0  
Amortization       (38.6)  
Changes in foreign currency exchange rates       (1.7)  
Impairment       0.0  
Balance at end of the period 896.0     896.0  
Europe and Asia Pacific          
Intangible Assets          
Balance at beginning of the period       352.5  
Additions       0.0  
Amortization       (12.2)  
Changes in foreign currency exchange rates       13.2  
Impairment       0.0  
Balance at end of the period 353.5     353.5  
Global FX          
Intangible Assets          
Balance at beginning of the period       56.2  
Additions       0.0  
Amortization       (9.1)  
Changes in foreign currency exchange rates       0.0  
Impairment       0.0  
Balance at end of the period 47.1     47.1  
Digital          
Intangible Assets          
Balance at beginning of the period       83.4  
Additions       0.0  
Sales       (0.1)  
Amortization       (2.3)  
Changes in foreign currency exchange rates       0.0  
Impairment   $ (81.0)   (81.0)  
Balance at end of the period $ 0.0     $ 0.0