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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($)
Segment Reporting Information |  |  |  |
Number of reportable segments | segment |  |  | 5 |
Revenues | $ 816.8 | $ 792.7 | $ 2,628.4 | $ 2,582.9
Operating income (loss) | 190.7 | 139.3 | 585.3 | 527.4
Operating Segments | Options |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 374.3 | 312.8 | 1,106.7 | 986.9
Operating income (loss) | 136.5 | 94.4 | 390.4 | 331.2
Operating Segments | North American Equities |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 336.3 | 403.6 | 1,215.8 | 1,367.8
Operating income (loss) | 31.5 | 33.1 | 114.0 | 138.0
Operating Segments | Futures |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 29.8 | 24.0 | 89.7 | 87.1
Operating income (loss) | 16.3 | 10.1 | 49.1 | 45.3
Operating Segments | Europe and Asia Pacific |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 61.9 | 39.1 | 172.8 | 97.3
Operating income (loss) | 12.6 | 9.3 | 40.4 | 24.2
Operating Segments | Global FX |  |  |  |
Segment Reporting Information |  |  |  |
Revenues | 14.5 | 13.2 | 43.1 | 43.8
Operating income (loss) | 0.3 | 0.6 | 1.9 | 4.7
Corporate Items and Eliminations |  |  |  |
Segment Reporting Information |  |  |  |
Revenues |  |  | 0.3 |
Operating income (loss) | $ (6.5) | $ (8.2) | $ (10.5) | $ (16.0)

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