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ACQUISITIONS - Cboe Canada (Details) - USD ($) $ in Millions		7 Months Ended	12 Months Ended
	Jun. 01, 2022	Dec. 31, 2022	Dec. 31, 2022	Sep. 30, 2023
Acquisitions
Contingent consideration		$ (39.1)	$ (39.1)	$ (28.2)
Cboe Canada
Acquisitions
Goodwill	$ 132.4		132.6
Intangible assets	130.1	69.1	69.1
Net working capital	(6.9)	9.7	9.7
Contingent consideration	$ (54.3)	(10.1)	$ (10.1)
Goodwill, Total adjustments		0.2
Intangible assets, Total Adjustments		(61.0)
Net working capital, Total adjustments		16.6
Contingent consideration, Total adjustments		$ 44.2

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