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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Assets:      
U.S. Treasury securities $ 49.5 $ 64.2  
Deferred compensation plan assets 30.7 27.5  
Digital assets - safeguarded assets 42.0 22.9 $ 22.4
Digital assets held 0.1 0.9  
Total assets 122.3 115.5  
Liabilities:      
Contingent consideration liabilities 34.2 39.1  
Deferred compensation plan liabilities 30.7 27.5  
Digital assets - safeguarded liabilities 42.0 22.9 $ 22.4
Cboe Digital restricted common units liability 15.6 15.5  
Cboe Digital warrant liability 5.9 5.9  
Debt 1,595.7 1,573.9  
Total liabilities 1,724.1 1,684.8  
Level 1      
Assets:      
U.S. Treasury securities 49.5 64.2  
Deferred compensation plan assets 30.7 27.5  
Digital assets - safeguarded assets 42.0 22.9  
Digital assets held 0.1 0.9  
Total assets 122.3 115.5  
Liabilities:      
Deferred compensation plan liabilities 30.7 27.5  
Digital assets - safeguarded liabilities 42.0 22.9  
Total liabilities 72.7 50.4  
Level 2      
Liabilities:      
Debt 1,595.7 1,573.9  
Total liabilities 1,595.7 1,573.9  
Level 3      
Liabilities:      
Contingent consideration liabilities 34.2 39.1  
Cboe Digital restricted common units liability 15.6 15.5  
Cboe Digital warrant liability 5.9 5.9  
Total liabilities $ 55.7 $ 60.5