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CLEARING OPERATIONS - Narrative (Details) - EuroCCP	6 Months Ended
	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.

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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.

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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.

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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: