SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)
Segment Reporting Information
Number of reportable segments \| segment			6
Revenues	$ 974.0	$ 907.8	$ 1,931.2	$ 1,896.0
Operating income (loss)	210.1	244.8	492.5	492.7
Operating Segments \| Options
Segment Reporting Information
Revenues	482.3	471.5	959.7	957.6
Operating income (loss)	215.6	203.7	432.4	404.7
Operating Segments \| North American Equities
Segment Reporting Information
Revenues	353.3	320.6	702.9	700.4
Operating income (loss)	45.3	22.8	83.3	51.2
Operating Segments \| Europe and Asia Pacific
Segment Reporting Information
Revenues	81.6	68.3	162.3	140.6
Operating income (loss)	9.2	5.5	19.4	16.8
Operating Segments \| Futures
Segment Reporting Information
Revenues	35.9	30.0	67.3	62.1
Operating income (loss)	26.3	18.4	48.4	39.3
Operating Segments \| Global FX
Segment Reporting Information
Revenues	20.5	18.2	39.3	37.0
Operating income (loss)	9.2	5.0	15.8	9.7
Operating Segments \| Digital
Segment Reporting Information
Revenues	0.4	(0.8)	(0.3)	(1.7)
Operating income (loss)	(90.3)	(11.0)	(100.5)	(22.4)
Corporate Items and Eliminations
Segment Reporting Information
Operating income (loss)	$ (5.2)	$ 0.4	$ (6.3)	$ (6.6)

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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