FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Aug. 31, 2024	Jun. 30, 2024	May 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag				total fair value of the liabilities
Contingent consideration liabilities					$ 11.8
Reduction in contingent consideration liability					14.4
Fair Value, Recurring
Segment Reporting Information
Contingent consideration liabilities					$ 11.8
Cboe Canada
Segment Reporting Information
Contingent consideration liabilities				$ 0.0
Gain (loss) on settlement of contingent consideration	$ 1.0
Cboe Asia Pacific and Cboe Canada
Segment Reporting Information
Payment of contingent consideration				(13.9)
Gain (loss) on settlement of contingent consideration				$ (2.0)
Cboe Japan
Segment Reporting Information
Payment of contingent consideration			$ 5.7
Cboe Asia Pacific
Segment Reporting Information
Gain (loss) on settlement of contingent consideration		$ 2.7