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REGULATORY CAPITAL (Tables) | 9 Months Ended
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Sep. 30, 2025
REGULATORY CAPITAL [Abstract] |
Schedule of Actual and Minimum Regulatory Capital Requirements of the Subsidiary | The following table presents the Company’s subsidiaries with regulatory capital requirements discussed above, as well as the actual and minimum regulatory capital requirements of the subsidiary as of September 30, 2025 (in millions):
Subsidiary |  | Regulatory Authority |  | Actual |  | Minimum Requirement
Cboe Trading |  | FINRA/SEC |  | $ | 14.1 |  |  | $ | 0.9 |
BIDS Trading |  | FINRA/SEC |  | 3.5 |  |  | 0.2 |
Cboe Fixed Income |  | FINRA/SEC |  | 3.0 |  |  | 0.1 |
Cboe Europe |  | FCA |  | 73.9 |  |  | 36.5 |
Cboe Chi-X Europe |  | FCA |  | 0.3 |  |  | 0.1 |
Cboe NL |  | Dutch Authority for Financial Markets |  | 20.1 |  |  | 11.6 |
Cboe Clear Europe |  | DNB |  | 124.2 |  |  | 77.5 |
CFE |  | CFTC |  | 182.1 |  |  | 43.5 |
Cboe SEF |  | CFTC |  | 16.4 |  |  | 2.3 |
Cboe Digital Exchange |  | CFTC |  | 23.7 |  |  | — |
Cboe Clear U.S. |  | CFTC |  | 38.6 |  |  | 12.9 |
Cboe Australia |  | ASIC |  | 14.4 |  |  | 5.3 |
Cboe Japan |  | JFSA |  | 8.5 |  |  | 4.3 |

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- Definition Tabular disclosure of required and actual net worth amounts for mortgage banking as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 948 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481586/948-10-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 948 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481586/948-10-50-5 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 948 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481586/948-10-50-5 + Details
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