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FAIR VALUE MEASUREMENT - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information
Contingent consideration liabilities	$ 39.1	$ 70.5
Payment of contingent consideration liabilities	38.7	9.1	$ 2.2
Change in contingent consideration	$ 5.2
Number of other stock exchanges | item	3
Hanweck, FT Options, Trade Alert And Cboe Asia Pacific
Segment Reporting Information
Payment of contingent consideration liabilities	$ 38.7
Recurring
Segment Reporting Information
Contingent consideration liabilities	$ 39.1	$ 70.5

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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