REGULATORY CAPITAL - Narrative (Details)	Mar. 31, 2026 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