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STOCK-BASED COMPENSATION - Cboe Digital Restricted Common Units And Cboe Digital Warrants (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2023	Nov. 18, 2022	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Cboe Digital Restricted Common Units
Stock-based Compensation
Interest rate (as a percent)		5.00%
Adjustment to contra-revenue balance	$ 0.1
Contra-revenue recognized			$ 0.8	$ 1.6
Contra-revenue is expected to be recognized			$ 12.5	12.5	$ 14.0
Change in fair value of option				$ 0.0
Vesting period		5 years
Risk-free interest rate, minimum				3.67%
Risk-free interest rate, Maximum				3.78%
Expected dividend rate				0.00%
Number of shares
Beginning balance (in shares)				185
Granted (in shares)		185
Ending balance of Outstanding and exercisable (in shares)			185	185	185
Weighted average grant date fair value
Beginning balance (in USD per share)				$ 0.3
Ending balance of Outstanding and exercisable (in USD per share)			$ 0.3	$ 0.3	$ 0.3
Weighted average remaining contractual term of Outstanding and exercisable (in years)				5 years	6 years
Cboe Digital Restricted Common Units | Minimum
Stock-based Compensation
Expected volatility				60.00%
Expected term (in years)				4 years 6 months
Cboe Digital Restricted Common Units | Maximum
Stock-based Compensation
Expected volatility				65.00%
Expected term (in years)				6 years 6 months
Cboe Digital Warrants
Stock-based Compensation
Contra-revenue recognized			$ 0.3	$ 0.6
Contra-revenue is expected to be recognized			$ 5.3	5.3
Number of units called by warrants		80
Warrants vested (in shares)		0
Change in fair value of warrants				$ 0.0
Vesting period		2 years
Risk-free interest rate					3.77%
Expected dividend rate					0.00%
Expected volatility					65.00%
Expected term (in years)					4 years 7 months 6 days
Number of shares
Beginning balance (in shares)				80
Ending balance of Outstanding and exercisable (in shares)			80	80	80
Weighted average grant date fair value
Beginning balance (in USD per share)				$ 0.2
Ending balance of Outstanding and exercisable (in USD per share)			$ 0.2	$ 0.2	$ 0.2

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