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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) segment | Jun. 30, 2023 USD ($)
Segment Reporting Information |  |  |  |
Number of reportable segments | segment |  |  | 6 |
Revenues | $ 974.0 | $ 907.8 | $ 1,931.2 | $ 1,896.0
Operating income (loss) | 210.1 | 244.8 | 492.5 | 492.7
Operating Segments | Options |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 482.3 | 471.5 | 959.7 | 957.6
Operating income (loss) | 215.6 | 203.7 | 432.4 | 404.7
Operating Segments | North American Equities |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 353.3 | 320.6 | 702.9 | 700.4
Operating income (loss) | 45.3 | 22.8 | 83.3 | 51.2
Operating Segments | Europe and Asia Pacific |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 81.6 | 68.3 | 162.3 | 140.6
Operating income (loss) | 9.2 | 5.5 | 19.4 | 16.8
Operating Segments | Futures |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 35.9 | 30.0 | 67.3 | 62.1
Operating income (loss) | 26.3 | 18.4 | 48.4 | 39.3
Operating Segments | Global FX |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 20.5 | 18.2 | 39.3 | 37.0
Operating income (loss) | 9.2 | 5.0 | 15.8 | 9.7
Operating Segments | Digital |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 0.4 | (0.8) | (0.3) | (1.7)
Operating income (loss) | (90.3) | (11.0) | (100.5) | (22.4)
Corporate Items and Eliminations |  |  |  |
Segment Reporting Information |  |  |  |
Operating income (loss) | $ (5.2) | $ 0.4 | $ (6.3) | $ (6.6)

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