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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | ---
Assets: |  |  |
U.S. Treasury securities | $ 20.8 | $ 64.2 |
Deferred compensation plan assets | 36.7 | 27.5 |
Digital assets - safeguarded assets | 51.3 | 22.9 | $ 22.4
Digital assets held | 0.1 | 0.9 |
Total assets | 108.9 | 115.5 |
Liabilities: |  |  |
Contingent consideration liabilities | 11.8 | 39.1 |
Deferred compensation plan liabilities | 36.7 | 27.5 |
Digital assets - safeguarded liabilities | 51.3 | 22.9 | $ 22.4
Cboe Digital restricted common units liability | 18.7 | 15.5 |
Cboe Digital warrant liability | 5.9 | 5.9 |
Debt | 1,305.7 | 1,573.9 |
Total liabilities | 1,430.1 | 1,684.8 |
Level 1 |  |  |
Assets: |  |  |
U.S. Treasury securities | 20.8 | 64.2 |
Deferred compensation plan assets | 36.7 | 27.5 |
Digital assets - safeguarded assets |  | 22.9 |
Digital assets held | 0.1 | 0.9 |
Total assets | 57.6 | 115.5 |
Liabilities: |  |  |
Deferred compensation plan liabilities | 36.7 | 27.5 |
Digital assets - safeguarded liabilities |  | 22.9 |
Total liabilities | 36.7 | 50.4 |
Level 2 |  |  |
Assets: |  |  |
Digital assets - safeguarded assets | 51.3 |  |
Total assets | 51.3 |  |
Liabilities: |  |  |
Digital assets - safeguarded liabilities | 51.3 |  |
Debt | 1,305.7 | 1,573.9 |
Total liabilities | 1,357.0 | 1,573.9 |
Level 3 |  |  |
Liabilities: |  |  |
Contingent consideration liabilities | 11.8 | 39.1 |
Cboe Digital restricted common units liability | 18.7 | 15.5 |
Cboe Digital warrant liability | 5.9 | 5.9 |
Total liabilities | $ 36.4 | $ 60.5 |

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