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SEGMENT REPORTING - Summarized financial information by reportable segment (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting Information |  |  |
Number of reportable segments | segment | 5 |  |
Revenues | $ 3,494.8 | $ 3,427.1 | $ 2,496.1
Operating income (loss) | 805.9 | 662.2 | 537.2
Operating Segments | Options |  |  |
Segment Reporting Information |  |  |
Revenues | 1,505.0 | 1,330.1 | 983.1
Operating income (loss) | 538.0 | 430.4 | 334.3
Operating Segments | North American Equities |  |  |
Segment Reporting Information |  |  |
Revenues | 1,570.5 | 1,789.5 | 1,213.1
Operating income (loss) | 156.1 | 159.5 | 132.5
Operating Segments | Europe and Asia Pacific |  |  |
Segment Reporting Information |  |  |
Revenues | 240.3 | 140.5 | 110.8
Operating income (loss) | 56.0 | 33.5 | 20.3
Operating Segments | Futures |  |  |
Segment Reporting Information |  |  |
Revenues | 120.6 | 109.2 | 135.9
Operating income (loss) | 66.0 | 53.8 | 83.1
Operating Segments | Global FX |  |  |
Segment Reporting Information |  |  |
Revenues | 58.1 | 57.8 | 53.0
Operating income (loss) | 2.7 | 6.0 | (4.9)
Corporate Items and Eliminations |  |  |
Segment Reporting Information |  |  |
Revenues | 0.3 |  | 0.2
Operating income (loss) | $ (12.9) | $ (21.0) | $ (28.1)

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