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FAIR VALUE MEASUREMENT - Fair value hierarchy for assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Aug. 04, 2020
--- | --- | --- | ---
Assets: |  |  |
Total assets | $ 37.1 | $ 92.4 |
Liabilities: |  |  |
Contingent consideration liabilities | 70.5 | 32.7 |
Total liabilities | 1,397.8 | 1,376.3 |
Hanweck, FT Options, Trade Alert, and MATCHNow |  |  |
Liabilities: |  |  |
Contingent consideration liabilities |  |  | $ 32.7
Level 1 |  |  |
Assets: |  |  |
Total assets | 37.1 | 92.4 |
Liabilities: |  |  |
Total liabilities | 28.0 | 24.5 |
Level 2 |  |  |
Liabilities: |  |  |
Total liabilities | 1,299.3 | 1,319.1 |
Level 3 |  |  |
Liabilities: |  |  |
Contingent consideration liabilities | 70.5 | 32.7 |
Total liabilities | 70.5 | 32.7 |
Recurring |  |  |
Assets: |  |  |
Total assets | 37.1 | 92.4 |
Liabilities: |  |  |
Contingent consideration liabilities | 70.5 | 32.7 |
Total liabilities | 70.5 | 32.7 |
Recurring | Mutual funds |  |  |
Assets: |  |  |
Total assets | 18.4 | 15.9 |
Recurring | Money market funds |  |  |
Assets: |  |  |
Total assets | 9.6 | 8.6 |
Recurring | U.S. Treasury securities |  |  |
Assets: |  |  |
Total assets | 9.1 | 67.9 |
Recurring | Level 1 |  |  |
Assets: |  |  |
Total assets | 37.1 | 92.4 |
Recurring | Level 1 | Mutual funds |  |  |
Assets: |  |  |
Total assets | 18.4 | 15.9 |
Recurring | Level 1 | Money market funds |  |  |
Assets: |  |  |
Total assets | 9.6 | 8.6 |
Recurring | Level 1 | U.S. Treasury securities |  |  |
Assets: |  |  |
Total assets | 9.1 | 67.9 |
Recurring | Level 3 |  |  |
Liabilities: |  |  |
Contingent consideration liabilities | 70.5 | 32.7 |
Total liabilities | $ 70.5 | $ 32.7 |

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