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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
U.S. Treasury securities | $ 47.1 | $ 20.8
Deferred compensation plan assets | 36.6 | 36.7
Digital assets - safeguarded assets | 6.9 | 51.3
Note receivable - building sale | 6.4 |
Digital assets held |  | 0.1
Total assets | 97.0 | 108.9
Liabilities: |  |
Contingent consideration liabilities | 1.8 | 11.8
Deferred compensation plan liabilities | 36.6 | 36.7
Digital assets - safeguarded liabilities | 6.9 | 51.3
Cboe Digital restricted common units liability |  | 18.7
Cboe Digital warrant liability |  | 5.9
Debt | 1,294.1 | 1,305.7
Total liabilities | 1,339.4 | 1,430.1
Level 1 |  |
Assets: |  |
U.S. Treasury securities | 47.1 | 20.8
Deferred compensation plan assets | 36.6 | 36.7
Digital assets held |  | 0.1
Total assets | 83.7 | 57.6
Liabilities: |  |
Deferred compensation plan liabilities | 36.6 | 36.7
Total liabilities | 36.6 | 36.7
Level 2 |  |
Assets: |  |
Digital assets - safeguarded assets | 6.9 | 51.3
Total assets | 6.9 | 51.3
Liabilities: |  |
Digital assets - safeguarded liabilities | 6.9 | 51.3
Debt | 1,294.1 | 1,305.7
Total liabilities | 1,301.0 | 1,357.0
Level 3 |  |
Assets: |  |
Note receivable - building sale | 6.4 |
Total assets | 6.4 |
Liabilities: |  |
Contingent consideration liabilities | 1.8 | 11.8
Cboe Digital restricted common units liability |  | 18.7
Cboe Digital warrant liability |  | 5.9
Total liabilities | $ 1.8 | $ 36.4

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