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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022 USD ($) segment	Mar. 31, 2022 segment	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Segment Reporting Information
Number of reportable segments | segment	6	5		6
Revenues	$ 985.8		$ 800.8	$ 1,960.3	$ 1,811.6
Operating income (loss)	(237.4)		190.0	2.3	394.6
Operating Segments | Options
Segment Reporting Information
Revenues	438.2		350.0	860.8	732.4
Operating income (loss)	178.1		125.2	340.8	253.9
Operating Segments | North American Equities
Segment Reporting Information
Revenues	432.8		353.5	856.5	879.5
Operating income (loss)	32.6		37.4	71.2	82.5
Operating Segments | Europe and Asia Pacific
Segment Reporting Information
Revenues	67.4		55.1	146.0	110.9
Operating income (loss)	10.7		13.3	31.6	27.8
Operating Segments | Futures
Segment Reporting Information
Revenues	30.5		28.3	62.8	59.9
Operating income (loss)	15.3		15.3	32.3	32.8
Operating Segments | Global FX
Segment Reporting Information
Revenues	16.8		13.9	34.1	28.6
Operating income (loss)	2.7		0.4	5.1	1.6
Operating Segments | Digital
Segment Reporting Information
Revenues	0.1			0.1
Operating income (loss)	(473.6)			(473.6)
Corporate Items and Eliminations
Segment Reporting Information
Revenues					0.3
Operating income (loss)	$ (3.2)		$ (1.6)	$ (5.1)	$ (4.0)

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