REGULATORY CAPITAL - Subsidiaries with Regulatory Capital Requirements (Details) $ in Millions	Dec. 31, 2024 USD ($)
Cboe Trading
Regulatory Capital Requirement [Line Items]
Actual	$ 11.0
Minimum Requirement	1.1
BIDS Trading
Regulatory Capital Requirement [Line Items]
Actual	8.0
Minimum Requirement	0.2
Cboe Fixed Income
Regulatory Capital Requirement [Line Items]
Actual	4.4
Minimum Requirement	0.1
Cboe Europe
Regulatory Capital Requirement [Line Items]
Actual	65.1
Minimum Requirement	32.7
Cboe Chi-X Europe
Regulatory Capital Requirement [Line Items]
Actual	0.1
Minimum Requirement	0.1
Cboe Clear Europe
Regulatory Capital Requirement [Line Items]
Actual	89.2
Minimum Requirement	57.9
CFE
Regulatory Capital Requirement [Line Items]
Actual	60.4
Minimum Requirement	41.4
Cboe SEF
Regulatory Capital Requirement [Line Items]
Actual	2.9
Minimum Requirement	2.0
Cboe Digital Exchange
Regulatory Capital Requirement [Line Items]
Actual	35.1
Minimum Requirement	2.9
Cboe Clear U.S.
Regulatory Capital Requirement [Line Items]
Actual	31.6
Minimum Requirement	10.5
Cboe Australia
Regulatory Capital Requirement [Line Items]
Actual	13.5
Minimum Requirement	5.0
Cboe Japan
Regulatory Capital Requirement [Line Items]
Actual	10.0
Minimum Requirement	4.4
Cboe NL
Regulatory Capital Requirement [Line Items]
Actual	12.5
Minimum Requirement	$ 8.4