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FAIR VALUE MEASUREMENT - Changes in fair value of Level 3 financial assets (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024
Assets: |  |
Balance at Beginning of Period | $ 6.4 | $ 0.0
Realized (Losses) Gains during Period | 0.0 | (0.6)
Adjustments | 0.0 | 0.0
Additions | 0.0 | 7.0
Settlements | 0.0 | 0.0
Foreign Currency Translation | 0.0 | 0.0
Balance at End of Period | 6.4 | 6.4
Liabilities: |  |
Balance at Beginning of Period | 1.8 | 36.4
Realized Losses (Gains) during Period | (1.0) | (0.4)
Adjustments | 0.0 | (16.2)
Additions | 0.0 | 0.0
Settlements | (0.9) | (19.9)
Foreign Currency Translation | 0.1 | 0.1
Balance at End of Period | 0.0 | 0.0
Contingent consideration liabilities |  |
Liabilities: |  |
Balance at Beginning of Period | 1.8 | 11.8
Realized Losses (Gains) during Period | (1.0) | 2.0
Adjustments | 0.0 | 0.0
Additions | 0.0 | 0.0
Settlements | (0.9) | (13.9)
Foreign Currency Translation | 0.1 | 0.1
Balance at End of Period | 0.0 | 0.0
Cboe Digital restricted common units liability |  |
Liabilities: |  |
Balance at Beginning of Period |  | 18.7
Realized Losses (Gains) during Period |  | (1.0)
Adjustments |  | (12.1)
Additions |  | 0.0
Settlements |  | (5.6)
Foreign Currency Translation |  | 0.0
Balance at End of Period | 0.0 | 0.0
Cboe Digital warrant liability |  |
Liabilities: |  |
Balance at Beginning of Period |  | 5.9
Realized Losses (Gains) during Period |  | (1.4)
Adjustments |  | (4.1)
Additions |  | 0.0
Settlements |  | (0.4)
Foreign Currency Translation |  | 0.0
Balance at End of Period | 0.0 | 0.0
Allowance for notes receivable credit losses |  |
Assets: |  |
Balance at Beginning of Period | 6.4 | 0.0
Realized (Losses) Gains during Period | 0.0 | (0.6)
Adjustments | 0.0 | 0.0
Additions | 0.0 | 7.0
Settlements | 0.0 | 0.0
Foreign Currency Translation | 0.0 | 0.0
Balance at End of Period | $ 6.4 | $ 6.4

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