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REGULATORY CAPITAL - Narrative (Details)	Sep. 30, 2025 USD ($) Test
Cboe Trading and BIDS Trading
Regulatory Capital Requirement [Line Items]
Minimum net capital required to be maintained (in percent)	6.67%
Minimum net capital required to be maintained, amount | $	$ 100,000
Cboe Fixed Income
Regulatory Capital Requirement [Line Items]
Minimum net capital required to be maintained (in percent)	6.67%
Minimum net capital required to be maintained, amount | $	$ 5,000.0
Cboe Chi-X Europe
Regulatory Capital Requirement [Line Items]
Capital resources requirement | $	$ 100,000
CFE
Regulatory Capital Requirement [Line Items]
Number of capital adequacy tests required to be met | Test	2
Cboe SEF
Regulatory Capital Requirement [Line Items]
Number of capital adequacy tests required to be met | Test	2
Cboe Clear U.S.
Regulatory Capital Requirement [Line Items]
Number of capital adequacy tests required to be met | Test	2
Cboe Japan
Regulatory Capital Requirement [Line Items]
Minimum required regulatory capital ratio (as a percent)	120.00%

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- Definition

Capital Resources Requirement

+ References

No definition available.

+ Details

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X

- Definition

Amount of minimum net capital required to be maintained.

+ References

No definition available.

+ Details

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- Definition

Amount of minimum net capital required to be maintained based on percentage of aggregate indebtedness items.

+ References

No definition available.

+ Details

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- Definition

Minimum amount of regulatory capital required by Japanese Financial Services Agency ("JFSA") and the Japan Securities Dealers Association ("JSDA").

+ References

No definition available.

+ Details

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- Definition

The number of capital adequacy tests required to be met.

+ References

No definition available.

+ Details

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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
-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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