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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) segment item customer | Dec. 31, 2022 USD ($) customer | Dec. 31, 2021 USD ($) customer | Sep. 30, 2022 USD ($)
Summary of Significant Accounting Policies |  |  |  |
Number of reportable segments | segment | 6 |  |  |
Revenues | $ 3,773.5 | $ 3,958.5 | $ 3,494.8 |
Goodwill | 3,140.6 | $ 3,122.8 | $ 3,025.4 |
Goodwill impairment from annual impairment test | 0.0 |  |  |
Intangible assets impairment loss | $ 0.0 |  |  |
Options to renew | true |  |  |
Option to terminate period | 1 year |  |  |
Minimum |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Useful life (in years) | 3 years |  |  |
Renewal term | 1 year |  |  |
Maximum |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Useful life (in years) | 7 years |  |  |
Renewal term | 5 years |  |  |
Option to terminate period | 1 year |  |  |
Cboe Digital |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Goodwill |  |  |  | $ 0.0
Transaction fees | Customer Risk |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Number of members | item | 2 |  |  |
Revenue | Customer Risk | Major Customer |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Number of customers | customer | 1 | 1 | 1 |
Revenues | $ 389.4 | $ 415.3 | $ 376.2 |
Concentration risk (as a percent) | 11.00% | 11.00% | 11.00% |

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