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REGULATORY CAPITAL - Subsidiaries with Regulatory Capital Requirements (Details) $ in Millions | Sep. 30, 2025 USD ($)
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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

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