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EMPLOYEE BENEFIT PLANS (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
SMART Plan
Defined Contribution Plan
Total assets in the trust			$ 26,200,000		$ 24,500,000
Company contribution amount	$ 3,600,000	$ 4,000,000.0	8,600,000	$ 8,100,000
Cboe Europe Employee Selected Stakeholder Contribution Plan
Defined Contribution Plan
Company contribution amount	300,000	200,000	800,000	600,000
EuroCCP
Defined Contribution Plan
Company contribution amount	200,000	$ 200,000	600,000	$ 200,000
Cboe Canadian Retirement Plan
Defined Contribution Plan
Company contribution amount	27,600		$ 100,000
Chi-X Asia Pacific Plans
Defined Contribution Plan
Company contribution amount	$ 200,000

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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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