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CLEARING OPERATIONS - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
Counterparty
market
clearinghouse
form
Dec. 31, 2025
USD ($)
Clearing Operations    
Number of clearing houses operated | clearinghouse 2  
Number of European markets in which equity is cleared | market 19  
Number of European markets in which equity derivatives are cleared | market 10  
Restricted cash, current | $ $ 34.5 $ 34.1
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