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FAIR VALUE MEASUREMENT - Changes in fair value of Level 3 financial liabilities (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2024
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | $ 33.0 | $ 36.4
Realized (Gains) Losses during period | 1.0 | 0.6
Adjustments | (16.2) | (16.2)
Settlements | (16.0) | (19.0)
Balance at End of Period | 1.8 | 1.8
Contingent consideration liabilities |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 8.8 | 11.8
Realized (Gains) Losses during period | 3.0 | 3.0
Settlements | (10.0) | (13.0)
Balance at End of Period | 1.8 | 1.8
Cboe Digital restricted common units liability |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 18.4 | 18.7
Realized (Gains) Losses during period | (0.7) | (1.0)
Adjustments | (12.1) | (12.1)
Settlements | (5.6) | (5.6)
Cboe Digital warrant liability |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at Beginning of Period | 5.8 | 5.9
Realized (Gains) Losses during period | (1.3) | (1.4)
Adjustments | (4.1) | (4.1)
Settlements | $ (0.4) | $ (0.4)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + 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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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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