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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Assets:      
U.S. Treasury securities $ 20.8 $ 64.2  
Deferred compensation plan assets 36.7 27.5  
Digital assets - safeguarded assets 51.3 22.9 $ 22.4
Digital assets held 0.1 0.9  
Total assets 108.9 115.5  
Liabilities:      
Contingent consideration liabilities 11.8 39.1  
Deferred compensation plan liabilities 36.7 27.5  
Digital assets - safeguarded liabilities 51.3 22.9 $ 22.4
Cboe Digital restricted common units liability 18.7 15.5  
Cboe Digital warrant liability 5.9 5.9  
Debt 1,305.7 1,573.9  
Total liabilities 1,430.1 1,684.8  
Level 1      
Assets:      
U.S. Treasury securities 20.8 64.2  
Deferred compensation plan assets 36.7 27.5  
Digital assets - safeguarded assets   22.9  
Digital assets held 0.1 0.9  
Total assets 57.6 115.5  
Liabilities:      
Deferred compensation plan liabilities 36.7 27.5  
Digital assets - safeguarded liabilities   22.9  
Total liabilities 36.7 50.4  
Level 2      
Assets:      
Digital assets - safeguarded assets 51.3    
Total assets 51.3    
Liabilities:      
Digital assets - safeguarded liabilities 51.3    
Debt 1,305.7 1,573.9  
Total liabilities 1,357.0 1,573.9  
Level 3      
Liabilities:      
Contingent consideration liabilities 11.8 39.1  
Cboe Digital restricted common units liability 18.7 15.5  
Cboe Digital warrant liability 5.9 5.9  
Total liabilities $ 36.4 $ 60.5