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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
U.S. Treasury securities | $ 70.0 | $ 20.8
Deferred compensation plan assets | 40.3 | 36.7
Note receivable - building sale | 6.2 |
Digital assets - safeguarded assets | 0.0 | 51.3
Digital assets held |  | 0.1
Total assets | 116.5 | 108.9
Liabilities: |  |
Contingent consideration liabilities |  | 11.8
Deferred compensation plan liabilities | 40.3 | 36.7
Digital assets - safeguarded liabilities | 0.0 | 51.3
Cboe Digital restricted common units liability |  | 18.7
Cboe Digital warrant liability |  | 5.9
Debt (5) | 1,317.0 | 1,305.7
Total liabilities | 1,357.3 | 1,430.1
Level 1 |  |
Assets: |  |
U.S. Treasury securities | 70.0 | 20.8
Deferred compensation plan assets | 40.3 | 36.7
Note receivable - building sale | 0.0 |
Digital assets - safeguarded assets |  | 0.0
Digital assets held |  | 0.1
Total assets | 110.3 | 57.6
Liabilities: |  |
Contingent consideration liabilities |  | 0.0
Deferred compensation plan liabilities | 40.3 | 36.7
Digital assets - safeguarded liabilities |  | 0.0
Cboe Digital restricted common units liability |  | 0.0
Cboe Digital warrant liability |  | 0.0
Debt (5) | 0.0 | 0.0
Total liabilities | 40.3 | 36.7
Level 2 |  |
Assets: |  |
U.S. Treasury securities | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Note receivable - building sale | 0.0 |
Digital assets - safeguarded assets |  | 51.3
Digital assets held |  | 0.0
Total assets | 0.0 | 51.3
Liabilities: |  |
Contingent consideration liabilities |  | 0.0
Deferred compensation plan liabilities | 0.0 | 0.0
Digital assets - safeguarded liabilities |  | 51.3
Cboe Digital restricted common units liability |  | 0.0
Cboe Digital warrant liability |  | 0.0
Debt (5) | 1,317.0 | 1,305.7
Total liabilities | 1,317.0 | 1,357.0
Level 3 |  |
Assets: |  |
U.S. Treasury securities | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Note receivable - building sale | 6.2 |
Digital assets - safeguarded assets |  | 0.0
Digital assets held |  | 0.0
Total assets | 6.2 | 0.0
Liabilities: |  |
Contingent consideration liabilities |  | 11.8
Deferred compensation plan liabilities | 0.0 | 0.0
Digital assets - safeguarded liabilities |  | 0.0
Cboe Digital restricted common units liability |  | 18.7
Cboe Digital warrant liability |  | 5.9
Debt (5) | 0.0 | 0.0
Total liabilities | $ 0.0 | $ 36.4

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