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FAIR VALUE MEASUREMENT - Fair value hierarchy for assets and liabilities on a recurring basis (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Note receivable - building sale | $ 6.4 |
Digital assets - safeguarded assets | 0.0 | $ 51.3
Total assets | 45.8 | 108.9
Liabilities: |  |
Contingent consideration liabilities |  | 11.8
Digital assets - safeguarded liabilities | 0.0 | 51.3
Cboe Digital restricted common units liability |  | 18.7
Cboe Digital warrant liability |  | 5.9
Total liabilities | 1,385.5 | 1,430.1
Level 1 |  |
Assets: |  |
Note receivable - building sale | 0.0 |
Digital assets - safeguarded assets |  | 0.0
Total assets | 39.4 | 57.6
Liabilities: |  |
Contingent consideration liabilities |  | 0.0
Digital assets - safeguarded liabilities |  | 0.0
Cboe Digital restricted common units liability |  | 0.0
Cboe Digital warrant liability |  | 0.0
Total liabilities | 38.9 | 36.7
Level 2 |  |
Assets: |  |
Note receivable - building sale | 0.0 |
Digital assets - safeguarded assets |  | 51.3
Total assets | 0.0 | 51.3
Liabilities: |  |
Contingent consideration liabilities |  | 0.0
Digital assets - safeguarded liabilities |  | 51.3
Cboe Digital restricted common units liability |  | 0.0
Cboe Digital warrant liability |  | 0.0
Total liabilities | 1,346.6 | 1,357.0
Level 3 |  |
Assets: |  |
Note receivable - building sale | 6.4 |
Digital assets - safeguarded assets |  | 0.0
Total assets | 6.4 | 0.0
Liabilities: |  |
Contingent consideration liabilities |  | 11.8
Digital assets - safeguarded liabilities |  | 0.0
Cboe Digital restricted common units liability |  | 18.7
Cboe Digital warrant liability |  | 5.9
Total liabilities | 0.0 | 36.4
Fair Value, Recurring |  |
Assets: |  |
Note receivable - building sale | 6.4 |
Digital assets - safeguarded assets |  | 51.3
Total assets | 45.8 | 108.8
Liabilities: |  |
Contingent consideration liabilities |  | 11.8
Digital assets - safeguarded liabilities |  | 51.3
Cboe Digital restricted common units liability |  | 18.7
Cboe Digital warrant liability |  | 5.9
Total liabilities |  | 87.7
Fair Value, Recurring | US Treasury Securities |  |
Assets: |  |
Debt securities | 0.5 | 20.8
Fair Value, Recurring | Mutual funds |  |
Assets: |  |
Marketable securities | 21.3 | 17.1
Fair Value, Recurring | Money market funds |  |
Assets: |  |
Marketable securities | 17.6 | 19.6
Fair Value, Recurring | Level 1 |  |
Assets: |  |
Note receivable - building sale | 0.0 |
Digital assets - safeguarded assets |  | 0.0
Total assets | 39.4 | 57.5
Liabilities: |  |
Contingent consideration liabilities |  | 0.0
Digital assets - safeguarded liabilities |  | 0.0
Cboe Digital restricted common units liability |  | 0.0
Cboe Digital warrant liability |  | 0.0
Total liabilities |  | 0.0
Fair Value, Recurring | Level 1 | US Treasury Securities |  |
Assets: |  |
Debt securities | 0.5 | 20.8
Fair Value, Recurring | Level 1 | Mutual funds |  |
Assets: |  |
Marketable securities | 21.3 | 17.1
Fair Value, Recurring | Level 1 | Money market funds |  |
Assets: |  |
Marketable securities | 17.6 | 19.6
Fair Value, Recurring | Level 2 |  |
Assets: |  |
Note receivable - building sale | 0.0 |
Digital assets - safeguarded assets |  | 51.3
Total assets | 0.0 | 51.3
Liabilities: |  |
Contingent consideration liabilities |  | 0.0
Digital assets - safeguarded liabilities |  | 51.3
Cboe Digital restricted common units liability |  | 0.0
Cboe Digital warrant liability |  | 0.0
Total liabilities |  | 51.3
Fair Value, Recurring | Level 2 | US Treasury Securities |  |
Assets: |  |
Debt securities | 0.0 | 0.0
Fair Value, Recurring | Level 2 | Mutual funds |  |
Assets: |  |
Marketable securities | 0.0 | 0.0
Fair Value, Recurring | Level 2 | Money market funds |  |
Assets: |  |
Marketable securities | 0.0 | 0.0
Fair Value, Recurring | Level 3 |  |
Assets: |  |
Note receivable - building sale | 6.4 |
Digital assets - safeguarded assets |  | 0.0
Total assets | 6.4 | 0.0
Liabilities: |  |
Contingent consideration liabilities |  | 11.8
Digital assets - safeguarded liabilities |  | 0.0
Cboe Digital restricted common units liability |  | 18.7
Cboe Digital warrant liability |  | 5.9
Total liabilities |  | 36.4
Fair Value, Recurring | Level 3 | US Treasury Securities |  |
Assets: |  |
Debt securities | 0.0 | 0.0
Fair Value, Recurring | Level 3 | Mutual funds |  |
Assets: |  |
Marketable securities | 0.0 | 0.0
Fair Value, Recurring | Level 3 | Money market funds |  |
Assets: |  |
Marketable securities | $ 0.0 | $ 0.0

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