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INCOME TAXES (Details) - case	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Aug. 08, 2021	Nov. 29, 2018
INCOME TAXES
Effective tax rate	30.70%	32.70%	33.50%	29.10%
Number of cases before the U.S. Tax Court					2	3

X

- Definition

The number of cases before the U.S. Tax Court.

+ References

No definition available.

+ Details

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Namespace Prefix:	cboe_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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