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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible Assets by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Intangible Assets      
Balance at beginning of the period $ 1,376.9    
Sales (0.1)    
Amortization (18.4)   $ (26.2)
Changes in foreign currency exchange rates 9.4    
Balance at end of the period 1,367.8    
Options      
Intangible Assets      
Balance at beginning of the period 126.4    
Sales 0.0    
Amortization (1.7)    
Changes in foreign currency exchange rates 0.0    
Balance at end of the period 124.7    
North American Equities      
Intangible Assets      
Balance at beginning of the period 879.6    
Sales (0.1)    
Amortization (10.4)    
Changes in foreign currency exchange rates 0.1    
Balance at end of the period 869.2    
Europe and Asia Pacific      
Intangible Assets      
Balance at beginning of the period 326.7    
Sales 0.0    
Amortization (3.7)    
Changes in foreign currency exchange rates 9.3    
Balance at end of the period 332.3    
Global FX      
Intangible Assets      
Balance at beginning of the period 44.2    
Sales 0.0    
Amortization (2.6)    
Changes in foreign currency exchange rates 0.0    
Balance at end of the period $ 41.6    
Digital      
Intangible Assets      
Impairment   $ (81.0)