SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) customer segment item shares	Dec. 31, 2023 USD ($) customer	Dec. 31, 2022 USD ($) customer
Summary of Significant Accounting Policies
Number of reportable segments | segment	6
Goodwill	$ 3,124.2	$ 3,140.6	$ 3,122.8
Impairment of goodwill	0.0	0.0	460.9
Impairment of intangible assets	81.0	0.0	0.0
Revenues	$ 4,094.5	$ 3,773.5	$ 3,958.5
Options to renew	true
Option to terminate period (in years)	1 year
Indefinite-Lived Intangible Assets, Excluding Digital Intangible Assets
Summary of Significant Accounting Policies
Impairment of intangible assets	$ 0.0
Cboe Digital Restricted Common Units
Summary of Significant Accounting Policies
Term of incentive program (in years)	2 years
Minimum
Summary of Significant Accounting Policies
Useful life (in years)	3 years
Renewal term (in years)	1 year
Maximum
Summary of Significant Accounting Policies
Useful life (in years)	7 years
Renewal term (in years)	5 years
Option to terminate period (in years)	1 year
Maximum | Cboe Digital Restricted Common Units
Summary of Significant Accounting Policies
Number of shares of common stock made available for purchase to employees | shares	20
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Major Customer
Summary of Significant Accounting Policies
Number of customers | customer	1	1	1
Concentration risk (as a percent)	10.00%	10.00%	10.00%
Revenues	$ 403.1	$ 389.4	$ 415.3
Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Summary of Significant Accounting Policies
Number of members | item	2