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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
U.S. Treasury securities | $ 43.0 | $ 9.1
Deferred compensation plan assets | 25.5 | 28.0
Digital assets - safeguarded assets | 22.4 |
Digital assets held | 0.9 |
Total assets | 91.8 | 37.1
Liabilities: |  |
Contingent consideration liabilities | 102.1 | 70.5
Deferred compensation plan liabilities | 25.5 | 28.0
Digital assets - safeguarded liabilities | 22.4 |
Debt | 1,959.2 | 1,299.3
Total liabilities | 2,109.2 | 1,397.8
Level 1 |  |
Assets: |  |
U.S. Treasury securities | 43.0 | 9.1
Deferred compensation plan assets | 25.5 | 28.0
Digital assets - safeguarded assets | 22.4 |
Digital assets held | 0.9 |
Total assets | 91.8 | 37.1
Liabilities: |  |
Deferred compensation plan liabilities | 25.5 | 28.0
Digital assets - safeguarded liabilities | 22.4 |
Total liabilities | 47.9 | 28.0
Level 2 |  |
Liabilities: |  |
Debt | 1,959.2 | 1,299.3
Total liabilities | 1,959.2 | 1,299.3
Level 3 |  |
Liabilities: |  |
Contingent consideration liabilities | 102.1 | 70.5
Total liabilities | $ 102.1 | $ 70.5

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