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FAIR VALUE MEASUREMENT - Changes in fair value of Level 3 financial liabilities (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Assets: |  |
Balance at Beginning of Period | $ 6.2 | $ 0.0
(Losses) Gains during Period | (0.8) |
Adjustments | 0.0 |
Additions | 7.0 |
Settlements | 0.0 |
Foreign Currency Translation | 0.0 |
Liabilities: |  |
Balance at Beginning of Period | 36.4 | 60.5
Losses (Gains) during Period | (0.4) | (14.4)
Adjustments | (16.2) | 0.1
Additions | 0.0 | 3.1
Settlements | (19.9) | (13.1)
Foreign Currency Translation | 0.1 | 0.2
Balance at End of Period | 0.0 | 36.4
Contingent consideration liabilities |  |
Liabilities: |  |
Balance at Beginning of Period | 11.8 | 39.1
Losses (Gains) during Period | 2.0 | (14.4)
Adjustments | 0.0 | 0.0
Additions | 0.0 | 0.0
Settlements | (13.9) | (13.1)
Foreign Currency Translation | 0.1 | 0.2
Balance at End of Period | 0.0 | 11.8
Cboe Digital restricted common units liability |  |
Liabilities: |  |
Balance at Beginning of Period | 18.7 | 15.5
Losses (Gains) during Period | (1.0) | 0.0
Adjustments | (12.1) | 0.1
Additions | 0.0 | 3.1
Settlements | (5.6) | 0.0
Foreign Currency Translation | 0.0 | 0.0
Balance at End of Period | 0.0 | 18.7
Cboe Digital warrant liability |  |
Liabilities: |  |
Balance at Beginning of Period | 5.9 | 5.9
Losses (Gains) during Period | (1.4) | 0.0
Adjustments | (4.1) | 0.0
Additions | 0.0 | 0.0
Settlements | (0.4) | 0.0
Foreign Currency Translation | 0.0 | 0.0
Balance at End of Period | 0.0 | 5.9
Allowance for notes receivable credit losses | Fair Value Option, Note Receivable |  |
Assets: |  |
Balance at Beginning of Period | 6.2 | $ 0.0
(Losses) Gains during Period | (0.8) |
Adjustments | 0.0 |
Additions | 7.0 |
Settlements | 0.0 |
Foreign Currency Translation | $ 0.0 |

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