REGULATORY CAPITAL - Subsidiaries with Regulatory Capital Requirements (Details) $ in Millions	Sep. 30, 2024 USD ($)
Cboe Trading
Regulatory Capital Requirement [Line Items]
Actual	$ 11.3
Minimum Requirement	1.0
BIDS Trading
Regulatory Capital Requirement [Line Items]
Actual	10.1
Minimum Requirement	0.4
Cboe Fixed Income
Regulatory Capital Requirement [Line Items]
Actual	4.9
Minimum Requirement	0.1
Cboe Europe
Regulatory Capital Requirement [Line Items]
Actual	67.5
Minimum Requirement	34.7
Cboe Chi-X Europe
Regulatory Capital Requirement [Line Items]
Actual	0.1
Minimum Requirement	0.1
Cboe NL
Regulatory Capital Requirement [Line Items]
Actual	16.7
Minimum Requirement	7.9
Cboe Clear Europe
Regulatory Capital Requirement [Line Items]
Actual	89.1
Minimum Requirement	62.8
CFE
Regulatory Capital Requirement [Line Items]
Actual	60.5
Minimum Requirement	41.2
Cboe SEF
Regulatory Capital Requirement [Line Items]
Actual	2.7
Minimum Requirement	2.0
Cboe Digital Exchange
Regulatory Capital Requirement [Line Items]
Actual	33.6
Minimum Requirement	6.1
Cboe Clear Digital
Regulatory Capital Requirement [Line Items]
Actual	31.0
Minimum Requirement	6.4
Cboe Australia
Regulatory Capital Requirement [Line Items]
Actual	19.2
Minimum Requirement	5.4
Cboe Japan
Regulatory Capital Requirement [Line Items]
Actual	11.4
Minimum Requirement	$ 5.0