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FAIR VALUE MEASUREMENT - Narrative (Details) $ in Millions | 12 Months Ended
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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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