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CLEARING OPERATIONS - Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended
Sep. 30, 2021
market
Jun. 30, 2025
USD ($)
market
item
Counterparty
form
Dec. 31, 2024
USD ($)
Clearing Operations      
Number of clearing houses operated | item   2  
Number of European markets | market 10 18  
Restricted cash, current   $ 30.2 $ 0.0
Cboe Clear Europe Credit Facility      
Clearing Operations      
Number of central counterparties with whom interoperable agreements are held | Counterparty   2  
Number of forms utilized for default waterfalls | form   2  
Default and liquidity waterfalls regulatory capital, scenario one   25.00%  
Cboe Clear Europe Credit Facility | Minimum      
Clearing Operations      
Default and liquidity waterfalls regulatory capital   35.00%  
Default and liquidity waterfalls regulatory capital, scenario two   10.00%  
Cboe Clear Europe Credit Facility | Maximum      
Clearing Operations      
Default and liquidity waterfalls regulatory capital   50.00%  
Default and liquidity waterfalls regulatory capital, scenario two   25.00%  
Cboe Clear U.S.      
Clearing Operations      
Restricted cash, current   $ 25.0