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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 USD ($) segment | Mar. 31, 2021 USD ($)
Segment Reporting Information |  |
Number of reportable segments | segment | 5 |
Revenues | $ 974.5 | $ 1,010.8
Operating income (loss) | 239.7 | 204.6
Operating Segments | Options |  |
Segment Reporting Information |  |
Revenues | 422.6 | 382.4
Operating income (loss) | 162.7 | 128.7
Operating Segments | North American Equities |  |
Segment Reporting Information |  |
Revenues | 423.7 | 526.0
Operating income (loss) | 38.6 | 45.1
Operating Segments | Europe and Asia Pacific |  |
Segment Reporting Information |  |
Revenues | 78.6 | 55.8
Operating income (loss) | 20.9 | 14.5
Operating Segments | Futures |  |
Segment Reporting Information |  |
Revenues | 32.3 | 31.6
Operating income (loss) | 17.0 | 17.5
Operating Segments | Global FX |  |
Segment Reporting Information |  |
Revenues | 17.3 | 14.7
Operating income (loss) | 2.4 | 1.2
Corporate Items and Eliminations |  |
Segment Reporting Information |  |
Revenues |  | 0.3
Operating income (loss) | $ (1.9) | $ (2.4)

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