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The threshold amount transferred to (or secured in favor of) any provider of settlement or custody services under the debt instrument arrangement.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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DEBT (Details) € in Millions, $ in Millions													6 Months Ended		12 Months Ended
DEBT (Details) € in Millions, $ in Millions	Jun. 21, 2023 USD ($)	May 12, 2023 USD ($)	Dec. 27, 2022 USD ($)	Dec. 01, 2022 USD ($)	Nov. 01, 2022 USD ($)	Sep. 22, 2022 USD ($)	Aug. 25, 2022 USD ($)	May 31, 2022 USD ($)	Apr. 29, 2022 USD ($)	Feb. 25, 2022 USD ($) subsidiary	Jun. 25, 2021 USD ($)	Jul. 01, 2020 USD ($)	Jun. 30, 2023 USD ($) subsidiary	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2023 EUR (€) subsidiary	Mar. 16, 2022 USD ($)	Dec. 15, 2020 USD ($)	Jul. 01, 2020 EUR (€)	Mar. 22, 2018 USD ($)	Jan. 12, 2017 USD ($)
Debt Instrument
Proceeds from long-term debt														$ 663.6
Repayments of outstanding indebtedness													$ 140.0
Borrowings outstanding													1,603.1		$ 1,742.0
Amended term loan agreement
Debt Instrument
Proceeds from long-term debt											$ 110.0
Repayments of outstanding indebtedness	$ 75.0	$ 65.0	$ 30.0	$ 50.0	$ 40.0	$ 50.0	$ 50.0						$ 140.0		220.0
Amended term loan agreement \| Prime Rate
Debt Instrument
Interest rate margin (as a percent)													0.50%
Amended term loan agreement \| Secured Overnight Financing Rate ("SOFR")
Debt Instrument
Interest rate margin (as a percent)													0.65%
Term Loan Agreement
Debt Instrument
Debt instrument face amount																				$ 300.0
Minimum consolidated interest ratio													4.00
Maximum consolidated leverage ratio													3.50			3.50
Maximum consolidated leverage ratio, scenario one													4.25			4.25
Maximum consolidated leverage ratio, scenario two													4.00			4.00
Borrowings outstanding													$ 164.9		304.7
3.650% Senior Notes due January 2027
Debt Instrument
Debt instrument face amount													$ 650.0		$ 650.0						$ 650.0
Interest rate (as a percent)													3.65%		3.65%	3.65%					3.65%
Borrowings outstanding													$ 647.6		$ 647.3
1.625% Senior Notes due December 2030
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%
Borrowings outstanding													$ 494.4		$ 494.0
3.000% Senior Notes due March 2032
Debt Instrument
Debt instrument face amount													$ 300.0		$ 300.0		$ 300.0
Interest rate (as a percent)													3.00%		3.00%	3.00%	3.00%
Borrowings outstanding													$ 296.2		$ 296.0
Senior Notes
Debt Instrument
Redemption price													101.00%
Revolving Credit Agreement
Debt Instrument
Minimum consolidated interest ratio													4.00
Maximum consolidated leverage ratio													3.50			3.50
Minimum consolidated interest ratio, scenario one													4.25
Minimum consolidated interest ratio, scenario two													4.00
Credit agreement, maximum borrowing capacity										$ 400.0
Term of agreement										3 years
Maximum borrowing capacity, increase limit										$ 200.0
Maximum borrowing capacity, total with increase										$ 600.0
Number of subsidiaries designated as additional borrowers \| subsidiary													0			0
Borrowings outstanding													$ 0.0
Borrowing capacity available													$ 400.0
Revolving Credit Agreement \| Minimum
Debt Instrument
Interest rate margin (as a percent)													0.75%
Number of subsidiaries that may be designated as additional borrowers \| subsidiary										1
Revolving Credit Agreement \| Maximum
Debt Instrument
Interest rate margin (as a percent)													1.25%
Revolving Credit Agreement \| Prime Rate \| Minimum
Debt Instrument
Interest rate margin (as a percent)													0.00%
Revolving Credit Agreement \| Prime Rate \| Maximum
Debt Instrument
Interest rate margin (as a percent)													0.25%
Revolving Credit Agreement \| Floor Rate
Debt Instrument
Interest rate margin (as a percent)													1.00%
Revolving Credit Agreement \| Dollars SFOR
Debt Instrument
Interest rate margin (as a percent)													0.10%
Revolving Credit Agreement \| Sterling SONIA
Debt Instrument
Interest rate margin (as a percent)													0.0326%
Revolving Credit Agreement \| Euros EURIBOR
Debt Instrument
Interest rate margin (as a percent)													0.00%
Revolving Credit Agreement \| Swing Line Sub-Facility
Debt Instrument
Credit agreement, maximum borrowing capacity										$ 25.0
Cboe Clear Europe Credit Facility
Debt Instrument
Debt instrument face amount \| €																			€ 1,250
Maximum borrowing capacity, increase limit \| €																			500
Maximum borrowing capacity, total with increase \| €																			1,750
Borrowings outstanding \| €																€ 0
Borrowing capacity available \| €																€ 1,250
Debt instrument, threshold amount transferred to provider of settlement or custody services \| €																			500
Percentage of commitment fee												0.275%
Debt instrument, threshold net worth on each drawdown												$ 1,750.0
Debt instrument, amount to meet minimum liquidity regulations \| €																			€ 30
Cboe Clear Europe Credit Facility \| Base Rate
Debt Instrument
Interest rate margin (as a percent)												1.60%
Cboe Clear Europe Credit Facility \| Federal Funds Effective Rate
Debt Instrument
Interest rate margin (as a percent)												0.50%
Cboe Digital \| Amended term loan agreement
Debt Instrument
Proceeds from long-term debt									$ 190.0
Cboe Canada \| Amended term loan agreement
Debt Instrument
Proceeds from long-term debt								$ 175.0