SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)
Segment Reporting Information
Number of reportable segments \| segment	6
Revenues	$ 957.2	$ 988.2
Operating income (loss)	282.4	247.9
Operating Segments \| Options
Segment Reporting Information
Revenues	477.4	486.1
Operating income (loss)	216.8	201.0
Operating Segments \| North American Equities
Segment Reporting Information
Revenues	349.6	379.8
Operating income (loss)	38.0	28.4
Operating Segments \| Europe and Asia Pacific
Segment Reporting Information
Revenues	80.7	72.3
Operating income (loss)	10.2	11.3
Operating Segments \| Futures
Segment Reporting Information
Revenues	31.4	32.1
Operating income (loss)	22.1	20.9
Operating Segments \| Global FX
Segment Reporting Information
Revenues	18.8	18.8
Operating income (loss)	6.6	4.7
Operating Segments \| Digital
Segment Reporting Information
Revenues	(0.7)	(0.9)
Operating income (loss)	(10.2)	(11.4)
Corporate Items and Eliminations
Segment Reporting Information
Operating income (loss)	$ (1.1)	$ (7.0)

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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