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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2024 | Jun. 30, 2024 | May 31, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Segment Reporting Information |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  | $ 11.8
Gain (loss) on settlement of contingent consideration |  |  |  |  | $ (2.0) | $ 0.0 |
Cboe Canada |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  | $ 0.0 | 0.0 |  |
Gain (loss) on settlement of contingent consideration | $ 1.0 |  |  |  |  |  |
Cboe Asia Pacific and Cboe Canada |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |
Payment of contingent consideration |  |  |  | $ 0.9 | 13.9 |  |
Gain (loss) on settlement of contingent consideration |  |  |  |  | $ (2.0) |  |
Cboe Japan |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |
Payment of contingent consideration |  |  | $ 5.7 |  |  |  |
Cboe Asia Pacific |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |
Gain (loss) on settlement of contingent consideration |  | $ 2.7 |  |  |  |  |

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