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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
segment
item
customer
Dec. 31, 2022
USD ($)
customer
Dec. 31, 2021
USD ($)
customer
Sep. 30, 2022
USD ($)
Summary of Significant Accounting Policies        
Number of reportable segments | segment 6      
Revenues $ 3,773.5 $ 3,958.5 $ 3,494.8  
Goodwill 3,140.6 $ 3,122.8 $ 3,025.4  
Goodwill impairment from annual impairment test 0.0      
Intangible assets impairment loss $ 0.0      
Options to renew true      
Option to terminate period 1 year      
Minimum        
Summary of Significant Accounting Policies        
Useful life (in years) 3 years      
Renewal term 1 year      
Maximum        
Summary of Significant Accounting Policies        
Useful life (in years) 7 years      
Renewal term 5 years      
Option to terminate period 1 year      
Cboe Digital        
Summary of Significant Accounting Policies        
Goodwill       $ 0.0
Transaction fees | Customer Risk        
Summary of Significant Accounting Policies        
Number of members | item 2      
Revenue | Customer Risk | Major Customer        
Summary of Significant Accounting Policies        
Number of customers | customer 1 1 1  
Revenues $ 389.4 $ 415.3 $ 376.2  
Concentration risk (as a percent) 11.00% 11.00% 11.00%