CLEARING OPERATIONS - Clearing participant (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Clearing Operations
Cboe Clear Europe central bank account	$ 1,690.7	$ 772.4
Cboe Clear Europe reverse repurchase and other	342.8	62.4
Cboe Clear Digital customer bank deposits	5.5	14.0
Total cash margin deposits, clearing funds, and interoperability funds	2,039.0	848.8
Cboe Clear Europe non-cash contributions	980.9	930.6
Margin Deposits
Clearing Operations
Cboe Clear Europe central bank account	1,262.2	361.3
Cboe Clear Europe reverse repurchase and other	63.8	2.7
Cboe Clear Digital customer bank deposits	5.5	14.0
Total cash margin deposits, clearing funds, and interoperability funds	1,331.5	378.0
Cboe Clear Europe non-cash contributions	621.8	637.0
Clearing Funds
Clearing Operations
Cboe Clear Europe central bank account	186.8	140.1
Cboe Clear Europe reverse repurchase and other	0.0	4.1
Cboe Clear Digital customer bank deposits	0.0	0.0
Total cash margin deposits, clearing funds, and interoperability funds	186.8	144.2
Cboe Clear Europe non-cash contributions	80.2	65.6
Interoperability Funds
Clearing Operations
Cboe Clear Europe central bank account	241.7	271.0
Cboe Clear Europe reverse repurchase and other	279.0	55.6
Cboe Clear Digital customer bank deposits	0.0	0.0
Total cash margin deposits, clearing funds, and interoperability funds	520.7	326.6
Cboe Clear Europe non-cash contributions	$ 278.9	$ 228.0