CLEARING OPERATIONS - Cboe Clear Digital (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Clearing Operations
Interest on customer bank deposits	$ 0.1	$ 0.6
Digital assets - safeguarded liabilities	0.0	0.0	$ 51.3
Digital assets - safeguarded assets	0.0	0.0	51.3
Cboe Clear Digital
Clearing Operations
Digital assets - safeguarded assets	$ 0.0	$ 0.0	$ 51.3