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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Assets:    
U.S. Treasury securities $ 23.6 $ 20.8
Deferred compensation plan assets 35.2 36.7
Digital assets - safeguarded assets 93.3 51.3
Digital assets held 0.1 0.1
Total assets 152.2 108.9
Liabilities:    
Contingent consideration liabilities 8.8 11.8
Deferred compensation plan liabilities 35.2 36.7
Digital assets - safeguarded liabilities 93.3 51.3
Cboe Digital restricted common units liability 18.4 18.7
Cboe Digital warrant liability 5.8 5.9
Debt 1,301.6 1,305.7
Total liabilities 1,463.1 1,430.1
Level 1    
Assets:    
U.S. Treasury securities 23.6 20.8
Deferred compensation plan assets 35.2 36.7
Digital assets held 0.1 0.1
Total assets 58.9 57.6
Liabilities:    
Deferred compensation plan liabilities 35.2 36.7
Total liabilities 35.2 36.7
Level 2    
Assets:    
Digital assets - safeguarded assets 93.3 51.3
Total assets 93.3 51.3
Liabilities:    
Digital assets - safeguarded liabilities 93.3 51.3
Debt 1,301.6 1,305.7
Total liabilities 1,394.9 1,357.0
Level 3    
Liabilities:    
Contingent consideration liabilities 8.8 11.8
Cboe Digital restricted common units liability 18.4 18.7
Cboe Digital warrant liability 5.8 5.9
Total liabilities $ 33.0 $ 36.4