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CLEARING OPERATIONS - Narrative (Details) - EuroCCP | 6 Months Ended
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Jun. 30, 2021 Counterparty item
Clearing Operations [Line Items] |
Number of European Markets | item | 18
Number of central counterparties | Counterparty | 2
Default and liquid waterfalls regulatory capital | 25.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | cboe_ClearingOperationsLineItems
Namespace Prefix: | cboe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percent of own regulatory capital is used for clearing the default and liquid waterfalls participants. + References No definition available. + Details
Name: | cboe_DefaultAndLiquidWaterfallsOwnClearingPercentRegulatoryCapital
Namespace Prefix: | cboe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of other central counterparties with whom interoperable arrangements are made. + References No definition available. + Details
Name: | cboe_NumberOfCentralCounterpartiesWithWhomInteroperableArrangementsAreMade
Namespace Prefix: | cboe_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of european markets in which equity is cleared. + References No definition available. + Details
Name: | cboe_NumberOfEuropeanMarketsInWhichEquityIsCleared
Namespace Prefix: | cboe_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=cboe_EuroCCPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |