SEGMENT REPORTING (Tables)

9 Months Ended

Sep. 30, 2024

Segment Reporting [Abstract]

Summarized financial data of reportable segments

Summarized financial data of reportable segments was as follows (in millions):

	Options		North American Equities		Europe and Asia Pacific		Futures		Global FX		Digital		Corporate Items and Eliminations		Total
Three Months Ended September 30, 2024
Revenues	$	510.3	$	403.6	$	81.1	$	39.9	$	20.7	$	0.1	$	—	$	1,055.7
Operating income (loss)	221.2		44.1		11.3		29.4		9.2		(6.2)		(1.6)		307.4
Three Months Ended September 30, 2023
Revenues	$	474.2	$	317.1	$	66.8	$	33.4	$	18.7	$	(1.4)	$	—	$	908.8
Operating income (loss)	213.9		34.9		2.6		24.3		8.5		(12.6)		(0.4)		271.2

	Options		North American Equities		Europe and Asia Pacific		Futures		Global FX		Digital		Corporate Items and Eliminations		Total
Nine Months Ended September 30, 2024
Revenues	$	1,470.0	$	1,106.5	$	243.4	$	107.2	$	60.0	$	(0.2)	$	—	$	2,986.9
Operating income (loss)	653.6		127.4		30.7		77.8		25.0		(106.7)		(7.9)		799.9
Nine Months Ended September 30, 2023
Revenues	$	1,431.8	$	1,017.5	$	207.4	$	95.5	$	55.7	$	(3.1)	$	—	$	2,804.8
Operating income (loss)	618.6		86.1		19.4		63.6		18.2		(35.0)		(7.0)		763.9

Schedule of revenues less cost of revenues by primary jurisdiction

The following summarizes revenues less cost of revenues based on primary jurisdiction (in millions):

	United States		Non-U.S.		Total
Revenues less cost of revenues:
Three months ended September 30, 2024	$	468.2	$	63.8	$	532.0
Three months ended September 30, 2023	422.6		57.9		480.5

	United States		Non-U.S.		Total
Revenues less cost of revenues:
Nine months ended September 30, 2024	$	1,357.9	$	190.0	$	1,547.9
Nine months ended September 30, 2023	1,242.2		176.8		1,419.0