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REGULATORY CAPITAL - Subsidiaries with Regulatory Capital Requirements (Details) $ in Millions	Sep. 30, 2025 USD ($)
Cboe Trading
Regulatory Capital Requirement [Line Items]
Actual	$ 14.1
Minimum Requirement	0.9
BIDS Trading
Regulatory Capital Requirement [Line Items]
Actual	3.5
Minimum Requirement	0.2
Cboe Fixed Income
Regulatory Capital Requirement [Line Items]
Actual	3.0
Minimum Requirement	0.1
Cboe Europe
Regulatory Capital Requirement [Line Items]
Actual	73.9
Minimum Requirement	36.5
Cboe Chi-X Europe
Regulatory Capital Requirement [Line Items]
Actual	0.3
Minimum Requirement	0.1
Cboe NL
Regulatory Capital Requirement [Line Items]
Actual	20.1
Minimum Requirement	11.6
Cboe Clear Europe
Regulatory Capital Requirement [Line Items]
Actual	124.2
Minimum Requirement	77.5
CFE
Regulatory Capital Requirement [Line Items]
Actual	182.1
Minimum Requirement	43.5
Cboe SEF
Regulatory Capital Requirement [Line Items]
Actual	16.4
Minimum Requirement	2.3
Cboe Digital Exchange
Regulatory Capital Requirement [Line Items]
Actual	23.7
Minimum Requirement	0.0
Cboe Clear U.S.
Regulatory Capital Requirement [Line Items]
Actual	38.6
Minimum Requirement	12.9
Cboe Australia
Regulatory Capital Requirement [Line Items]
Actual	14.4
Minimum Requirement	5.3
Cboe Japan
Regulatory Capital Requirement [Line Items]
Actual	8.5
Minimum Requirement	$ 4.3

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
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- Definition

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+ References

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