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COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2024
Jan. 29, 2024
Trading registrations and licenses | Minimum    
Commitments, Contingencies and Guarantees    
Year 1 $ 17.1  
Year 2 17.1  
Year 3 17.1  
Year 4 17.1  
Year 5 17.1  
Trading registrations and licenses | Maximum    
Commitments, Contingencies and Guarantees    
Year 1 18.1  
Year 2 18.1  
Year 3 18.1  
Year 4 18.1  
Year 5 18.1  
Trading registrations and licenses | Cloud services provider | Minimum    
Commitments, Contingencies and Guarantees    
Year 1   $ 5.3
Year 2   5.3
Year 3   5.3
Year 4   5.3
Year 5   5.3
Trading registrations and licenses | Cloud services provider | Maximum    
Commitments, Contingencies and Guarantees    
Year 1   6.9
Year 2   6.9
Year 3   6.9
Year 4   6.9
Year 5   $ 6.9
Developed Technology Rights | Cboe Canada    
Commitments, Contingencies and Guarantees    
Contractual obligations $ 0.6  
Contractual obligation term (in years) 1 year