SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($) segment	Jun. 30, 2022 segment	Mar. 31, 2022 USD ($) segment
Segment Reporting Information
Number of reportable segments \| segment	6	6	5
Revenues	$ 988.2		$ 974.5
Operating income (loss)	247.9		239.7
Operating Segments \| Options
Segment Reporting Information
Revenues	486.1		422.6
Operating income (loss)	201.0		162.7
Operating Segments \| North American Equities
Segment Reporting Information
Revenues	379.8		423.7
Operating income (loss)	28.4		38.6
Operating Segments \| Europe and Asia Pacific
Segment Reporting Information
Revenues	72.3		78.6
Operating income (loss)	11.3		20.9
Operating Segments \| Futures
Segment Reporting Information
Revenues	32.1		32.3
Operating income (loss)	20.9		17.0
Operating Segments \| Global FX
Segment Reporting Information
Revenues	18.8		17.3
Operating income (loss)	4.7		2.4
Operating Segments \| Digital
Segment Reporting Information
Revenues	(0.9)
Operating income (loss)	(11.4)
Corporate Items and Eliminations
Segment Reporting Information
Operating income (loss)	$ (7.0)		$ (1.9)

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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The net result for the period of deducting operating expenses from operating revenues.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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