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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information |  |  |
Number of reportable segments | segment | 6 |  |
Revenues | $ 3,773.5 | $ 3,958.5 | $ 3,494.8
Operating income (loss) | 1,057.9 | 489.6 | 805.9
Operating Segments | Options |  |  |
Segment Reporting Information |  |  |
Revenues | 1,939.5 | 1,823.2 | 1,505.0
Operating income (loss) | 851.3 | 740.5 | 538.0
Operating Segments | North American Equities |  |  |
Segment Reporting Information |  |  |
Revenues | 1,353.0 | 1,681.7 | 1,570.5
Operating income (loss) | 118.0 | 146.6 | 156.1
Operating Segments | Europe and Asia Pacific |  |  |
Segment Reporting Information |  |  |
Revenues | 281.2 | 264.6 | 240.3
Operating income (loss) | 32.7 | 38.1 | 56.0
Operating Segments | Futures |  |  |
Segment Reporting Information |  |  |
Revenues | 129.0 | 119.8 | 120.6
Operating income (loss) | 86.1 | 55.2 | 66.0
Operating Segments | Global FX |  |  |
Segment Reporting Information |  |  |
Revenues | 74.9 | 68.9 | 58.1
Operating income (loss) | 24.7 | 8.8 | 2.7
Operating Segments | Digital |  |  |
Segment Reporting Information |  |  |
Revenues | (4.1) | 0.3 |
Operating income (loss) | (46.7) | (491.4) |
Corporate Items and Eliminations |  |  |
Segment Reporting Information |  |  |
Revenues |  |  | 0.3
Operating income (loss) | $ (8.2) | $ (8.2) | $ (12.9)

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