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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Segment Reporting Information |  |  |  |
Contingent consideration liabilities | $ 75.2 | $ 75.2 |  | $ 32.7
Payment of contingent consideration liabilities |  | 7.1 | $ 2.2 |
Chi-X Asia Pacific |  |  |  |
Segment Reporting Information |  |  |  |
Payment of contingent consideration liabilities | 0.6 |  |  |
Recurring |  |  |  |
Segment Reporting Information |  |  |  |
Contingent consideration liabilities | $ 75.2 | $ 75.2 |  | $ 32.7

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