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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Goodwill by Segment (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2026
USD ($)
Goodwill  
Balance at beginning of the period $ 3,150.5
Reclassified to assets held for sale (91.6)
Changes in foreign currency exchange rates (11.3)
Balance at end of the period 3,047.6
Options  
Goodwill  
Balance at beginning of the period 306.0
Reclassified to assets held for sale 0.0
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 1,998.1
Reclassified to assets held for sale (60.9)
Changes in foreign currency exchange rates (5.7)
Balance at end of the period 1,931.5
Europe and Asia Pacific  
Goodwill  
Balance at beginning of the period 579.0
Reclassified to assets held for sale (30.7)
Changes in foreign currency exchange rates (5.6)
Balance at end of the period 542.7
Global FX  
Goodwill  
Balance at beginning of the period 267.4
Reclassified to assets held for sale 0.0
Changes in foreign currency exchange rates 0.0
Balance at end of the period $ 267.4