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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting Information
Number of reportable segments | segment	5
Revenues	$ 974.5	$ 1,010.8
Operating income (loss)	239.7	204.6
Operating Segments | Options
Segment Reporting Information
Revenues	422.6	382.4
Operating income (loss)	162.7	128.7
Operating Segments | North American Equities
Segment Reporting Information
Revenues	423.7	526.0
Operating income (loss)	38.6	45.1
Operating Segments | Europe and Asia Pacific
Segment Reporting Information
Revenues	78.6	55.8
Operating income (loss)	20.9	14.5
Operating Segments | Futures
Segment Reporting Information
Revenues	32.3	31.6
Operating income (loss)	17.0	17.5
Operating Segments | Global FX
Segment Reporting Information
Revenues	17.3	14.7
Operating income (loss)	2.4	1.2
Corporate Items and Eliminations
Segment Reporting Information
Revenues		0.3
Operating income (loss)	$ (1.9)	$ (2.4)

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