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CLEARING OPERATIONS - Narrative (Details) $ in Millions | 9 Months Ended |
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Sep. 30, 2025 USD ($) item Counterparty form market | Dec. 31, 2024 USD ($)
Clearing Operations |  |
Number of clearing houses operated | item | 2 |
Number of European and American markets | market | 18 |
Number of European markets | market | 10 |
Restricted cash, current | $ | $ 32.5 | $ 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 |

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