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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) segment | Jun. 30, 2020 USD ($)
Segment Reporting Information |  |  |  |
Number of reportable segments | segment |  |  | 5 |
Revenues | $ 800.8 | $ 868.7 | $ 1,811.6 | $ 1,790.2
Operating income (loss) | 190.0 | 161.7 | 394.6 | 388.1
Operating Segments | Options |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 350.0 | 317.6 | 732.4 | 674.1
Operating income (loss) | 125.2 | 93.4 | 253.9 | 236.8
Operating Segments | North American Equities |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 353.5 | 490.5 | 879.5 | 964.2
Operating income (loss) | 37.4 | 55.9 | 82.5 | 104.9
Operating Segments | Futures |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 28.3 | 21.6 | 59.9 | 63.1
Operating income (loss) | 15.3 | 8.3 | 32.8 | 35.2
Operating Segments | Europe |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 55.1 | 25.3 | 110.9 | 58.2
Operating income (loss) | 13.3 | 5.4 | 27.8 | 14.9
Operating Segments | Global FX |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 13.9 | 13.7 | 28.6 | 30.6
Operating income (loss) | 0.4 | 1.1 | 1.6 | 4.1
Corporate Items and Eliminations |  |  |  |
Segment Reporting Information |  |  |  |
Revenues |  |  | 0.3 |
Operating income (loss) | $ (1.6) | $ (2.4) | $ (4.0) | $ (7.8)

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