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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) segment | Sep. 30, 2023 USD ($)
Segment Reporting Information |  |  |  |
Number of reportable segments | segment |  |  | 6 |
Revenues | $ 1,055.7 | $ 908.8 | $ 2,986.9 | $ 2,804.8
Operating income (loss) | 307.4 | 271.2 | 799.9 | 763.9
Operating Segments | Options |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 510.3 | 474.2 | 1,470.0 | 1,431.8
Operating income (loss) | 221.2 | 213.9 | 653.6 | 618.6
Operating Segments | North American Equities |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 403.6 | 317.1 | 1,106.5 | 1,017.5
Operating income (loss) | 44.1 | 34.9 | 127.4 | 86.1
Operating Segments | Europe and Asia Pacific |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 81.1 | 66.8 | 243.4 | 207.4
Operating income (loss) | 11.3 | 2.6 | 30.7 | 19.4
Operating Segments | Futures |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 39.9 | 33.4 | 107.2 | 95.5
Operating income (loss) | 29.4 | 24.3 | 77.8 | 63.6
Operating Segments | Global FX |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 20.7 | 18.7 | 60.0 | 55.7
Operating income (loss) | 9.2 | 8.5 | 25.0 | 18.2
Operating Segments | Digital |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 0.1 | (1.4) | (0.2) | (3.1)
Operating income (loss) | (6.2) | (12.6) | (106.7) | (35.0)
Corporate Items and Eliminations |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Operating income (loss) | $ (1.6) | $ (0.4) | $ (7.9) | $ (7.0)

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