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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting Information
Number of reportable segments | segment	5
Revenues	$ 1,010.8	$ 921.5
Operating income (loss)	204.6	226.4
Operating Segments | Options
Segment Reporting Information
Revenues	382.4	356.5
Operating income (loss)	128.7	143.4
Operating Segments | North American Equities
Segment Reporting Information
Revenues	526.0	473.7
Operating income (loss)	45.1	49.0
Operating Segments | Futures
Segment Reporting Information
Revenues	31.6	41.5
Operating income (loss)	17.5	26.9
Operating Segments | Europe
Segment Reporting Information
Revenues	55.8	32.9
Operating income (loss)	14.5	9.5
Operating Segments | Global FX
Segment Reporting Information
Revenues	14.7	16.9
Operating income (loss)	1.2	3.0
Corporate Items and Eliminations
Segment Reporting Information
Revenues	0.3
Operating income (loss)	$ (2.4)	$ (5.4)

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