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FAIR VALUE MEASUREMENT - Fair value hierarchy for assets and liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Total assets | $ 48.7 | $ 37.1
Liabilities: |  |
Contingent consideration liabilities | 53.3 | 70.5
Total liabilities | 1,674.3 | 1,397.8
Level 1 |  |
Assets: |  |
Total assets | 48.7 | 37.1
Liabilities: |  |
Total liabilities | 27.4 | 28.0
Level 2 |  |
Liabilities: |  |
Total liabilities | 1,593.6 | 1,299.3
Level 3 |  |
Liabilities: |  |
Contingent consideration liabilities | 53.3 | 70.5
Total liabilities | 53.3 | 70.5
Recurring |  |
Assets: |  |
Total assets | 48.7 | 37.1
Liabilities: |  |
Contingent consideration liabilities | 53.3 | 70.5
Total liabilities | 53.3 | 70.5
Recurring | U.S. Treasury securities |  |
Assets: |  |
Total assets | 21.3 | 9.1
Recurring | Marketable securities | Mutual funds |  |
Assets: |  |
Total assets | 17.4 | 18.4
Recurring | Marketable securities | Money market funds |  |
Assets: |  |
Total assets | 10.0 | 9.6
Recurring | Level 1 |  |
Assets: |  |
Total assets | 48.7 | 37.1
Recurring | Level 1 | U.S. Treasury securities |  |
Assets: |  |
Total assets | 21.3 | 9.1
Recurring | Level 1 | Marketable securities | Mutual funds |  |
Assets: |  |
Total assets | 17.4 | 18.4
Recurring | Level 1 | Marketable securities | Money market funds |  |
Assets: |  |
Total assets | 10.0 | 9.6
Recurring | Level 3 |  |
Liabilities: |  |
Contingent consideration liabilities | 53.3 | 70.5
Total liabilities | $ 53.3 | $ 70.5

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