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SEGMENT REPORTING - Summarized Financial Information By Reportable Segment (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting Information |  |  |
Number of reportable segments | segment | 6 |  |
Revenues | $ 4,094.5 | $ 3,773.5 | $ 3,958.5
Total cost of revenues | 2,022.1 | 1,855.5 | 2,216.8
Revenues less cost of revenues: | 2,072.4 | 1,918.0 | 1,741.7
Depreciation and amortization | 133.0 | 158.0 | 166.8
Other segment operating expenses | 841.0 | 702.1 | 1,085.3
Operating income (loss) | 1,098.4 | 1,057.9 | 489.6
Non-operating (expenses) income: |  |  |
Interest expense | (51.5) | (62.4) | (60.0)
Interest income | 27.3 | 12.0 | 3.6
Earnings on investments | 29.0 | 39.5 | 7.2
Other (expense) income, net | (19.4) | 0.6 | (7.5)
Income before income tax provision | 1,083.8 | 1,047.6 | 432.9
Income tax provision | 318.9 | 286.2 | 197.9
Net income | 764.9 | 761.4 | 235.0
Operating Segments | Options |  |  |
Segment Reporting Information |  |  |
Revenues | 2,002.6 | 1,939.5 | 1,823.2
Total cost of revenues | 743.3 | 770.3 | 840.0
Revenues less cost of revenues: | 1,259.3 | 1,169.2 | 983.2
Depreciation and amortization | 27.0 | 30.1 | 26.5
Other segment operating expenses | 353.9 | 287.8 | 216.2
Operating income (loss) | 878.4 | 851.3 | 740.5
Non-operating (expenses) income: |  |  |
Interest expense | 0.1 | 0.2 | 0.0
Interest income | 0.5 | (0.1) | 0.0
Earnings on investments | 0.0 | 0.0 | 0.0
Other (expense) income, net | 0.8 | (0.1) | 0.1
Income before income tax provision | 879.8 | 851.3 | 740.6
Income tax provision | 299.1 | 275.7 | 260.7
Net income | 580.7 | 575.6 | 479.9
Operating Segments | North American Equities |  |  |
Segment Reporting Information |  |  |
Revenues | 1,546.8 | 1,353.0 | 1,681.7
Total cost of revenues | 1,163.0 | 987.7 | 1,302.8
Revenues less cost of revenues: | 383.8 | 365.3 | 378.9
Depreciation and amortization | 58.2 | 69.4 | 74.1
Other segment operating expenses | 157.0 | 177.9 | 158.2
Operating income (loss) | 168.6 | 118.0 | 146.6
Non-operating (expenses) income: |  |  |
Interest expense | 0.0 | 0.0 | 0.0
Interest income | 2.4 | 1.4 | 0.4
Earnings on investments | 0.0 | 0.0 | 0.0
Other (expense) income, net | 0.7 | 0.0 | (0.1)
Income before income tax provision | 171.7 | 119.4 | 146.9
Income tax provision | 23.1 | 14.8 | 20.5
Net income | 148.6 | 104.6 | 126.4
Operating Segments | Europe and Asia Pacific |  |  |
Segment Reporting Information |  |  |
Revenues | 324.2 | 281.2 | 264.6
Total cost of revenues | 104.0 | 91.0 | 68.5
Revenues less cost of revenues: | 220.2 | 190.2 | 196.1
Depreciation and amortization | 29.3 | 30.7 | 37.0
Other segment operating expenses | 149.2 | 126.8 | 121.0
Operating income (loss) | 41.7 | 32.7 | 38.1
Non-operating (expenses) income: |  |  |
Interest expense | (7.8) | (7.8) | (8.8)
Interest income | 4.1 | 3.0 | 0.8
Earnings on investments | 0.0 | 0.0 | 0.0
Other (expense) income, net | (0.1) | (0.6) | (0.4)
Income before income tax provision | 37.9 | 27.3 | 29.7
Income tax provision | 13.3 | 6.8 | 6.8
Net income | 24.6 | 20.5 | 22.9
Operating Segments | Futures |  |  |
Segment Reporting Information |  |  |
Revenues | 141.1 | 129.0 | 119.8
Total cost of revenues | 7.6 | 3.9 | 3.8
Revenues less cost of revenues: | 133.5 | 125.1 | 116.0
Depreciation and amortization | 2.3 | 2.0 | 2.6
Other segment operating expenses | 32.3 | 37.0 | 58.2
Operating income (loss) | 98.9 | 86.1 | 55.2
Non-operating (expenses) income: |  |  |
Interest expense | 0.0 | 0.0 | 0.0
Interest income | 0.0 | 0.0 | 0.0
Earnings on investments | 0.0 | 0.0 | 0.0
Other (expense) income, net | 0.0 | 0.0 | 0.0
Income before income tax provision | 98.9 | 86.1 | 55.2
Income tax provision | 28.4 | 33.4 | 42.4
Net income | 70.5 | 52.7 | 12.8
Operating Segments | Global FX |  |  |
Segment Reporting Information |  |  |
Revenues | 79.9 | 74.9 | 68.9
Total cost of revenues | 2.3 | 1.4 | 1.0
Revenues less cost of revenues: | 77.6 | 73.5 | 67.9
Depreciation and amortization | 13.5 | 18.4 | 21.9
Other segment operating expenses | 30.9 | 30.4 | 37.2
Operating income (loss) | 33.2 | 24.7 | 8.8
Non-operating (expenses) income: |  |  |
Interest expense | 0.0 | 0.0 | 0.3
Interest income | 0.1 | 0.0 | 0.1
Earnings on investments | 0.0 | 0.0 | 0.0
Other (expense) income, net | 0.0 | (0.2) | 0.0
Income before income tax provision | 33.3 | 24.5 | 9.2
Income tax provision | 0.1 | 0.5 | 0.1
Net income | 33.2 | 24.0 | 9.1
Operating Segments | Digital |  |  |
Segment Reporting Information |  |  |
Revenues | (0.1) | (4.1) | 0.3
Total cost of revenues | 1.9 | 1.2 | 0.7
Revenues less cost of revenues: | (2.0) | (5.3) | (0.4)
Depreciation and amortization | 2.8 | 7.4 | 4.7
Other segment operating expenses | 107.6 | 34.0 | 486.3
Operating income (loss) | (112.4) | (46.7) | (491.4)
Non-operating (expenses) income: |  |  |
Interest expense | 0.0 | 0.0 | 0.0
Interest income | 3.7 | 2.0 | 0.0
Earnings on investments | 0.0 | 0.0 | 0.0
Other (expense) income, net | 1.5 | 0.0 | 1.3
Income before income tax provision | (107.2) | (44.7) | (490.1)
Income tax provision | (28.6) | (10.4) | (119.0)
Net income | (78.6) | (34.3) | (371.1)
Corporate Items and Eliminations |  |  |
Segment Reporting Information |  |  |
Revenues | 0.0 | 0.0 | 0.0
Total cost of revenues | 0.0 | 0.0 | 0.0
Revenues less cost of revenues: | 0.0 | 0.0 | 0.0
Depreciation and amortization | (0.1) | 0.0 | 0.0
Other segment operating expenses | 10.1 | 8.2 | 8.2
Operating income (loss) | (10.0) | (8.2) | (8.2)
Non-operating (expenses) income: |  |  |
Interest expense | (43.8) | (54.8) | (51.5)
Interest income | 16.5 | 5.7 | 2.3
Earnings on investments | 29.0 | 39.5 | 7.2
Other (expense) income, net | (22.3) | 1.5 | (8.4)
Income before income tax provision | (30.6) | (16.3) | (58.6)
Income tax provision | (16.5) | (34.6) | (13.6)
Net income | $ (14.1) | $ 18.3 | $ (45.0)

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