Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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DEBT - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Mar. 16, 2022	Dec. 15, 2020	Jan. 12, 2017
Debt Instrument
Total debt	$ 1,443.8	$ 1,442.9
Line of Credit \| Revolving Credit Agreement
Debt Instrument
Total debt	0.0	0.0
Line of Credit \| Cboe Clear Europe Credit Facility
Debt Instrument
Total debt	0.0	0.0
3.650% Senior Notes
Debt Instrument
Debt instrument face amount	$ 650.0	$ 650.0			$ 650.0
Interest rate (as a percent)	3.65%	3.65%			3.65%
3.650% Senior Notes \| Senior Notes
Debt Instrument
Total debt	$ 649.6	$ 649.3
1.625% Senior Notes
Debt Instrument
Debt instrument face amount	$ 500.0	$ 500.0		$ 500.0
Interest rate (as a percent)	1.625%	1.625%		1.625%
1.625% Senior Notes \| Senior Notes
Debt Instrument
Total debt	$ 496.7	$ 496.3
3.000% Senior Notes
Debt Instrument
Debt instrument face amount	$ 300.0	$ 300.0	$ 300.0
Interest rate (as a percent)	3.00%	3.00%	3.00%
3.000% Senior Notes \| Senior Notes
Debt Instrument
Total debt	$ 297.5	$ 297.3