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FAIR VALUE MEASUREMENT - Changes in fair value of Level 3 financial liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | $ 60.5 | $ 70.5
Realized (Gains) Losses during period |  | (5.2)
Adjustments |  | (44.3)
Additions |  | 79.1
Settlements |  | (38.7)
Foreign Currency Translation |  | (0.9)
Balance at End of Period |  | 60.5
Contingent consideration liabilities |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 39.1 | 70.5
Realized (Gains) Losses during period |  | (5.2)
Adjustments |  | (44.3)
Additions |  | 57.7
Settlements |  | (38.7)
Foreign Currency Translation |  | (0.9)
Balance at End of Period |  | 39.1
Cboe Digital restricted common units liability |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 15.5 |
Additions |  | 15.5
Balance at End of Period |  | 15.5
Cboe Digital warrant liability |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 5.9 |
Additions |  | 5.9
Balance at End of Period |  | $ 5.9
Level 3 |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 60.5 |
Realized (Gains) Losses during period | $ (14.4) |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Business Combination, Contingent Consideration, Liability, Noncurrent | Business Combination, Contingent Consideration, Liability, Noncurrent
Adjustments | $ 0.1 |
Additions | 3.1 |
Settlements | (13.1) |
Foreign Currency Translation | 0.2 |
Balance at End of Period | 36.4 | $ 60.5
Level 3 | Contingent consideration liabilities |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 39.1 |
Realized (Gains) Losses during period | (14.4) |
Settlements | (13.1) |
Foreign Currency Translation | 0.2 |
Balance at End of Period | 11.8 | 39.1
Level 3 | Cboe Digital restricted common units liability |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 15.5 |
Adjustments | 0.1 |
Additions | 3.1 |
Balance at End of Period | 18.7 | 15.5
Level 3 | Cboe Digital warrant liability |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 5.9 |
Balance at End of Period | $ 5.9 | $ 5.9

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- Definition Amount of foreign currency translation gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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