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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Goodwill by Segment (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Goodwill  
Balance at beginning of the period $ 3,124.2
Changes in foreign currency exchange rates 22.7
Balance at end of the period 3,146.9
Options  
Goodwill  
Balance at beginning of the period 306.0
Changes in foreign currency exchange rates 0.0
Balance at end of the period 306.0
North American Equities  
Goodwill  
Balance at beginning of the period 1,990.8
Changes in foreign currency exchange rates 4.9
Balance at end of the period 1,995.7
Europe and Asia Pacific  
Goodwill  
Balance at beginning of the period 560.0
Changes in foreign currency exchange rates 17.8
Balance at end of the period 577.8
Global FX  
Goodwill  
Balance at beginning of the period 267.4
Changes in foreign currency exchange rates 0.0
Balance at end of the period $ 267.4