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REGULATORY CAPITAL - Subsidiaries with Regulatory Capital Requirements (Details) $ in Millions	Mar. 31, 2025 USD ($)
Cboe Trading
Regulatory Capital Requirement [Line Items]
Actual	$ 11.0
Minimum Requirement	1.1
BIDS Trading
Regulatory Capital Requirement [Line Items]
Actual	5.7
Minimum Requirement	0.2
Cboe Fixed Income
Regulatory Capital Requirement [Line Items]
Actual	4.0
Minimum Requirement	0.1
Cboe Europe
Regulatory Capital Requirement [Line Items]
Actual	67.1
Minimum Requirement	33.6
Cboe Chi-X Europe
Regulatory Capital Requirement [Line Items]
Actual	0.3
Minimum Requirement	0.1
Cboe NL
Regulatory Capital Requirement [Line Items]
Actual	14.2
Minimum Requirement	8.7
Cboe Clear Europe
Regulatory Capital Requirement [Line Items]
Actual	104.1
Minimum Requirement	63.0
CFE
Regulatory Capital Requirement [Line Items]
Actual	62.6
Minimum Requirement	42.6
Cboe SEF
Regulatory Capital Requirement [Line Items]
Actual	3.8
Minimum Requirement	2.4
Cboe Digital Exchange
Regulatory Capital Requirement [Line Items]
Actual	30.5
Minimum Requirement	1.1
Cboe Clear U.S.
Regulatory Capital Requirement [Line Items]
Actual	31.3
Minimum Requirement	11.9
Cboe Australia
Regulatory Capital Requirement [Line Items]
Actual	15.4
Minimum Requirement	5.0
Cboe Japan
Regulatory Capital Requirement [Line Items]
Actual	10.5
Minimum Requirement	$ 4.7

X

- Definition

Amount of total capital as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of minimum net worth required for mortgage banking as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481586/948-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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