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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD (Tables) | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill Details by Segment | The following table presents the details of goodwill by segment (in millions):
| Options |  | North American Equities |  | Europe and Asia Pacific |  | Global FX |  | Total
Balance as of December 31, 2024 | $ | 306.0 |  |  | $ | 1,990.8 |  |  | $ | 560.0 |  |  | $ | 267.4 |  |  | $ | 3,124.2 |
Changes in foreign currency exchange rates | — |  |  | 8.0 |  |  | 23.7 |  |  | — |  |  | 31.7 |
Balance as of June 30, 2025 | $ | 306.0 |  |  | $ | 1,998.8 |  |  | $ | 583.7 |  |  | $ | 267.4 |  |  | $ | 3,155.9 |
Schedule of Details of Intangible Assets by Segment | The following table presents the details of the intangible assets by segment (in millions):
| Options |  | North American Equities |  | Europe and Asia Pacific |  | Global FX |  | Total
Balance as of December 31, 2024 | $ | 126.4 |  |  | $ | 879.6 |  |  | $ | 326.7 |  |  | $ | 44.2 |  |  | $ | 1,376.9 |
Sales | — |  |  | (0.3) |  |  | — |  |  | — |  |  | (0.3) |
Amortization | (3.2) |  |  | (20.2) |  |  | (7.3) |  |  | (4.9) |  |  | (35.6) |
Changes in foreign currency exchange rates | — |  |  | 3.6 |  |  | 28.7 |  |  | — |  |  | 32.3 |
Impairment | — |  |  | — |  |  | (17.1) |  |  | — |  |  | (17.1) |
Balance as of June 30, 2025 | $ | 123.2 |  |  | $ | 862.7 |  |  | $ | 331.0 |  |  | $ | 39.3 |  |  | $ | 1,356.2 |
Schedule of Categories of Intangible Assets by Segment | The following tables present the categories of intangible assets by segment as of June 30, 2025 and December 31, 2024 (in millions, except as stated):
| June 30, 2025 |  | Weighted Average Amortization Period (in years)
| Options |  | North American Equities |  | Europe and Asia Pacific |  | Global FX |  |  |
Trading registrations and licenses | $ | 95.5 |  |  | $ | 605.0 |  |  | $ | 224.3 |  |  | $ | — |  |  |  |  | Indefinite
Customer relationships | 46.6 |  |  | 412.4 |  |  | 207.1 |  |  | 140.0 |  |  |  |  | 13
Market data customer relationships | 53.6 |  |  | 322.0 |  |  | 66.2 |  |  | 64.4 |  |  |  |  | 7
Technology | 28.1 |  |  | 56.3 |  |  | 36.1 |  |  | 22.5 |  |  |  |  | 6
Trademarks and trade names | 12.9 |  |  | 8.2 |  |  | 2.6 |  |  | 1.2 |  |  |  |  | 5
Digital assets held | — |  |  | 1.1 |  |  | — |  |  | — |  |  |  |  | Indefinite
Accumulated amortization | (113.5) |  |  | (542.3) |  |  | (205.3) |  |  | (188.8) |  |  |  |  |
| $ | 123.2 |  |  | $ | 862.7 |  |  | $ | 331.0 |  |  | $ | 39.3 |  |  |  |  |
| December 31, 2024 |  | Weighted Average Amortization Period (in years)
| Options |  | North American Equities |  | Europe and Asia Pacific |  | Global FX |  |  |
Trading registrations and licenses | $ | 95.5 |  |  | $ | 603.4 |  |  | $ | 205.2 |  |  | $ | — |  |  |  |  | Indefinite
Customer relationships | 46.6 |  |  | 409.7 |  |  | 209.2 |  |  | 140.0 |  |  |  |  | 14
Market data customer relationships | 53.6 |  |  | 322.0 |  |  | 60.8 |  |  | 64.4 |  |  |  |  | 7
Technology | 28.1 |  |  | 55.5 |  |  | 33.6 |  |  | 22.5 |  |  |  |  | 7
Trademarks and trade names | 12.9 |  |  | 8.1 |  |  | 2.3 |  |  | 1.2 |  |  |  |  | 5
Digital assets held | — |  |  | 1.2 |  |  | — |  |  | — |  |  |  |  | Indefinite
Accumulated amortization | (110.3) |  |  | (520.3) |  |  | (184.4) |  |  | (183.9) |  |  |  |  |
| $ | 126.4 |  |  | $ | 879.6 |  |  | $ | 326.7 |  |  | $ | 44.2 |  |  |  |  |

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