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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information
Number of reportable segments | segment	5
Revenues	$ 3,494.8	$ 3,427.1	$ 2,496.1
Operating income (loss)	805.9	662.2	537.2
Operating Segments | Options
Segment Reporting Information
Revenues	1,505.0	1,330.1	983.1
Operating income (loss)	538.0	430.4	334.3
Operating Segments | North American Equities
Segment Reporting Information
Revenues	1,570.5	1,789.5	1,213.1
Operating income (loss)	156.1	159.5	132.5
Operating Segments | Europe and Asia Pacific
Segment Reporting Information
Revenues	240.3	140.5	110.8
Operating income (loss)	56.0	33.5	20.3
Operating Segments | Futures
Segment Reporting Information
Revenues	120.6	109.2	135.9
Operating income (loss)	66.0	53.8	83.1
Operating Segments | Global FX
Segment Reporting Information
Revenues	58.1	57.8	53.0
Operating income (loss)	2.7	6.0	(4.9)
Corporate Items and Eliminations
Segment Reporting Information
Revenues	0.3		0.2
Operating income (loss)	$ (12.9)	$ (21.0)	$ (28.1)

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