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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($) segment | Jun. 30, 2022 segment | Mar. 31, 2022 USD ($) segment
Segment Reporting Information |  |  |
Number of reportable segments | segment | 6 | 6 | 5
Revenues | $ 988.2 |  | $ 974.5
Operating income (loss) | 247.9 |  | 239.7
Operating Segments | Options |  |  |
Segment Reporting Information |  |  |
Revenues | 486.1 |  | 422.6
Operating income (loss) | 201.0 |  | 162.7
Operating Segments | North American Equities |  |  |
Segment Reporting Information |  |  |
Revenues | 379.8 |  | 423.7
Operating income (loss) | 28.4 |  | 38.6
Operating Segments | Europe and Asia Pacific |  |  |
Segment Reporting Information |  |  |
Revenues | 72.3 |  | 78.6
Operating income (loss) | 11.3 |  | 20.9
Operating Segments | Futures |  |  |
Segment Reporting Information |  |  |
Revenues | 32.1 |  | 32.3
Operating income (loss) | 20.9 |  | 17.0
Operating Segments | Global FX |  |  |
Segment Reporting Information |  |  |
Revenues | 18.8 |  | 17.3
Operating income (loss) | 4.7 |  | 2.4
Operating Segments | Digital |  |  |
Segment Reporting Information |  |  |
Revenues | (0.9) |  |
Operating income (loss) | (11.4) |  |
Corporate Items and Eliminations |  |  |
Segment Reporting Information |  |  |
Operating income (loss) | $ (7.0) |  | $ (1.9)

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