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EMPLOYEE BENEFIT PLAN (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
SMART Plan
Defined Contribution Plan
Total assets in the trust			$ 25,600,000		$ 24,500,000
Company contribution amount	$ 2,800,000	$ 2,600,000	5,000,000.0	$ 4,100,000
Cboe Europe Employee Selected Stakeholder Contribution Plan
Defined Contribution Plan
Company contribution amount	100,000	$ 200,000	500,000	$ 400,000
EuroCCP
Defined Contribution Plan
Company contribution amount	200,000		400,000
Cboe Canadian Retirement Plan
Defined Contribution Plan
Company contribution amount	$ 31,400		$ 60,100

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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