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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information |  |  |
Contingent consideration liabilities | $ 70.5 | $ 32.7 |
Payment of contingent consideration liabilities | 9.1 | 2.2 | $ 4.3
Hanweck, FT Options, Trade Alert And Chi-X Asia Pacific |  |  |
Segment Reporting Information |  |  |
Payment of contingent consideration liabilities | 9.1 |  |
Recurring |  |  |
Segment Reporting Information |  |  |
Contingent consideration liabilities | $ 70.5 | $ 32.7 |

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