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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD (Tables) | 9 Months Ended
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Sep. 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 | — |  |  | 4.9 |  |  | 17.8 |  |  | — |  |  | 22.7 |
Balance as of September 30, 2025 | $ | 306.0 |  |  | $ | 1,995.7 |  |  | $ | 577.8 |  |  | $ | 267.4 |  |  | $ | 3,146.9 |
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 | — |  |  | (0.6) |  |  | — |  |  | — |  |  | (0.6) |
Amortization | (4.8) |  |  | (30.0) |  |  | (10.7) |  |  | (7.3) |  |  | (52.8) |
Changes in foreign currency exchange rates | — |  |  | 2.2 |  |  | 23.5 |  |  | — |  |  | 25.7 |
Impairment | — |  |  | — |  |  | (18.9) |  |  | — |  |  | (18.9) |
Balance as of September 30, 2025 | $ | 121.6 |  |  | $ | 851.2 |  |  | $ | 320.6 |  |  | $ | 36.9 |  |  | $ | 1,330.3 |
Schedule of Categories of Intangible Assets by Segment | The following tables present the categories of intangible assets by segment as of September 30, 2025 and December 31, 2024 (in millions, except as stated):
| September 30, 2025 |  | Weighted Average Amortization Period (in years)
| Options |  | North American Equities |  | Europe and Asia Pacific |  | Global FX |  |  |
Trading registrations and licenses | $ | 95.5 |  |  | $ | 604.4 |  |  | $ | 218.6 |  |  | $ | — |  |  |  |  | Indefinite
Customer relationships | 46.6 |  |  | 411.4 |  |  | 203.8 |  |  | 140.0 |  |  |  |  | 13
Market data customer relationships | 53.6 |  |  | 322.0 |  |  | 64.9 |  |  | 64.4 |  |  |  |  | 7
Technology | 28.1 |  |  | 56.0 |  |  | 35.6 |  |  | 22.5 |  |  |  |  | 6
Trademarks and trade names | 12.9 |  |  | 8.1 |  |  | 2.5 |  |  | 1.2 |  |  |  |  | 4
Digital assets held | — |  |  | 0.8 |  |  | — |  |  | — |  |  |  |  | Indefinite
Accumulated amortization | (115.1) |  |  | (551.5) |  |  | (204.8) |  |  | (191.2) |  |  |  |  |
| $ | 121.6 |  |  | $ | 851.2 |  |  | $ | 320.6 |  |  | $ | 36.9 |  |  |  |  |
| 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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