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STOCK-BASED COMPENSATION - Cboe Digital Restricted Common Units And Cboe Digital Warrants (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 18, 2022 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Stock-based Compensation |  |  |  |  |  |  |
Other (expense) income, net |  | $ (13.1) |  | $ 1.6 | $ (8.5) | $ 1.7 |
Cboe Digital Restricted Common Units |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Risk-free interest rate, minimum |  |  |  |  |  |  | 3.81%
Risk-free interest rate, Maximum |  |  |  |  |  |  | 3.90%
Term of incentive program |  |  |  |  | 2 years |  |
Contra revenue reversed |  |  |  |  | $ 2.4 |  |
Number of shares |  |  |  |  |  |  |
Beginning balance (in shares) |  | 185 |  |  |  |  |
Ending balance of Outstanding and exercisable (in shares) |  |  | 185 |  |  |  |
Weighted average grant date fair value |  |  |  |  |  |  |
Share-Based Payment Arrangement, Cash Used to Settle Award |  |  |  |  | $ 3.3 |  |
Cboe Digital Restricted Common Units | Minimum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Expected volatility |  |  |  |  |  |  | 60.00%
Cboe Digital Restricted Common Units | Maximum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  |  | 5 years 10 months 24 days
Common units authorized |  | 20 |  |  | 20 |  |
Cboe Digital Restricted Common Units |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Interest rate (as a percent) | 5.00% |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |  |
Expected dividend rate |  |  |  |  |  |  | 0.00%
Other (expense) income, net |  | $ (0.3) |  |  |  |  |
Contra revenue recognized |  | 1.4 |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) | 185 |  |  |  |  |  |
Weighted average grant date fair value |  |  |  |  |  |  |
Weighted average exercise price at fair value |  |  | $ 0.3 |  |  |  |
Weighted average remaining contractual term of Outstanding and exercisable (in years) |  |  | 5 years |  |  |  |
Share-Based Payment Arrangement, Cash Used to Settle Award |  | $ 2.3 |  |  |  |  |
Cboe Digital Restricted Common Units | Minimum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  |  | 3 years 10 months 24 days
Cboe Digital Restricted Common Units | Maximum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Expected volatility |  |  |  |  |  |  | 65.00%
Cboe Digital Warrant Units |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Number of units called by warrants | 80 |  |  |  |  |  |
Warrants vested (in shares) |  |  | 40 |  |  |  |
Class of warrant or right exercised |  |  | 0 |  |  |  |
Vesting period | 2 years |  |  |  |  |  |
Risk-free interest rate |  |  |  |  |  |  | 3.89%
Expected dividend rate |  |  |  |  |  |  | 0.00%
Expected volatility |  |  |  |  |  |  | 65.00%
Expected term (in years) |  |  |  |  |  |  | 4 years
Other (expense) income, net |  |  |  |  | $ 1.3 |  |
Weighted average grant date fair value |  |  |  |  |  |  |
Weighted average exercise price at fair value |  |  | $ 0.2 |  |  |  |
Share-Based Payment Arrangement, Cash Used to Settle Award |  |  |  |  | $ 0.4 |  |

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