SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information
Number of reportable segments \| segment	6
Revenues	$ 3,773.5	$ 3,958.5	$ 3,494.8
Operating income (loss)	1,057.9	489.6	805.9
Operating Segments \| Options
Segment Reporting Information
Revenues	1,939.5	1,823.2	1,505.0
Operating income (loss)	851.3	740.5	538.0
Operating Segments \| North American Equities
Segment Reporting Information
Revenues	1,353.0	1,681.7	1,570.5
Operating income (loss)	118.0	146.6	156.1
Operating Segments \| Europe and Asia Pacific
Segment Reporting Information
Revenues	281.2	264.6	240.3
Operating income (loss)	32.7	38.1	56.0
Operating Segments \| Futures
Segment Reporting Information
Revenues	129.0	119.8	120.6
Operating income (loss)	86.1	55.2	66.0
Operating Segments \| Global FX
Segment Reporting Information
Revenues	74.9	68.9	58.1
Operating income (loss)	24.7	8.8	2.7
Operating Segments \| Digital
Segment Reporting Information
Revenues	(4.1)	0.3
Operating income (loss)	(46.7)	(491.4)
Corporate Items and Eliminations
Segment Reporting Information
Revenues			0.3
Operating income (loss)	$ (8.2)	$ (8.2)	$ (12.9)

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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