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FAIR VALUE MEASUREMENT - Schedule of fair value hierarchy for assets measured at fair value on a recurring basis (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Total assets | $ 95.5 | $ 92.4
Liabilities: |  |
Contingent consideration liabilities | 32.1 | 32.7
Total liabilities | 1,243.9 | 1,376.3
Level 1 |  |
Assets: |  |
Total assets | 95.5 | 92.4
Liabilities: |  |
Total liabilities | 24.0 | 24.5
Level 2 |  |
Liabilities: |  |
Total liabilities | 1,187.8 | 1,319.1
Level 3 |  |
Liabilities: |  |
Contingent consideration liabilities | 32.1 | 32.7
Total liabilities | 32.1 | 32.7
Recurring |  |
Assets: |  |
Total assets | 95.5 | 92.4
Liabilities: |  |
Contingent consideration liabilities | 32.1 | 32.7
Total liabilities | 32.1 | 32.7
Recurring | U.S. Treasury securities |  |
Assets: |  |
Total assets | 71.5 | 67.9
Recurring | Marketable securities | Mutual funds |  |
Assets: |  |
Total assets | 14.6 | 15.9
Recurring | Marketable securities | Money market funds |  |
Assets: |  |
Total assets | 9.4 | 8.6
Recurring | Level 1 |  |
Assets: |  |
Total assets | 95.5 | 92.4
Recurring | Level 1 | U.S. Treasury securities |  |
Assets: |  |
Total assets | 71.5 | 67.9
Recurring | Level 1 | Marketable securities | Mutual funds |  |
Assets: |  |
Total assets | 14.6 | 15.9
Recurring | Level 1 | Marketable securities | Money market funds |  |
Assets: |  |
Total assets | 9.4 | 8.6
Recurring | Level 3 |  |
Liabilities: |  |
Contingent consideration liabilities | 32.1 | 32.7
Total liabilities | $ 32.1 | $ 32.7

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