CLEARING OPERATIONS - Clearing Participant (Details) $ in Millions	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Clearing Operations
Cboe Clear Europe central bank account	$ 613.2	$ 1,156.5
Cboe Clear Europe reverse repurchase and other	2,829.4	460.5
Cboe Clear U.S. customer bank deposits	1.3	1.2
Total cash margin deposits, default fund, and interoperability fund	3,443.9	1,618.2
Cboe Clear Europe non-cash contributions	$ 1,295.1	949.0
Minimum collateralization, as a percent	1.02
Margin Deposits
Clearing Operations
Cboe Clear Europe central bank account	$ 487.8	755.3
Cboe Clear Europe reverse repurchase and other	1,848.6	137.1
Cboe Clear U.S. customer bank deposits	1.3	1.2
Total cash margin deposits, default fund, and interoperability fund	2,337.7	893.6
Cboe Clear Europe non-cash contributions	837.4	601.3
Default Fund
Clearing Operations
Cboe Clear Europe central bank account	48.1	146.8
Cboe Clear Europe reverse repurchase and other	252.6	135.2
Cboe Clear U.S. customer bank deposits	0.0	0.0
Total cash margin deposits, default fund, and interoperability fund	300.7	282.0
Cboe Clear Europe non-cash contributions	66.5	70.1
Interoperability Fund
Clearing Operations
Cboe Clear Europe central bank account	77.3	254.4
Cboe Clear Europe reverse repurchase and other	728.2	188.2
Cboe Clear U.S. customer bank deposits	0.0	0.0
Total cash margin deposits, default fund, and interoperability fund	805.5	442.6
Cboe Clear Europe non-cash contributions	$ 391.2	$ 277.6