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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
U.S. Treasury securities | $ 9.1 | $ 67.9
Deferred compensation plan assets | 28.0 | 24.5
Total assets | 37.1 | 92.4
Liabilities: |  |
Contingent consideration liabilities | 70.5 | 32.7
Deferred compensation plan liabilities | 28.0 | 24.5
Debt | 1,299.3 | 1,319.1
Total liabilities | 1,397.8 | 1,376.3
Level 1 |  |
Assets: |  |
U.S. Treasury securities | 9.1 | 67.9
Deferred compensation plan assets | 28.0 | 24.5
Total assets | 37.1 | 92.4
Liabilities: |  |
Deferred compensation plan liabilities | 28.0 | 24.5
Total liabilities | 28.0 | 24.5
Level 2 |  |
Liabilities: |  |
Debt | 1,299.3 | 1,319.1
Total liabilities | 1,299.3 | 1,319.1
Level 3 |  |
Liabilities: |  |
Contingent consideration liabilities | 70.5 | 32.7
Total liabilities | $ 70.5 | $ 32.7

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