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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD (Tables) | 12 Months Ended
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Dec. 31, 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, 2023 | $ | 305.8 |  |  | $ | 2,004.4 |  |  | $ | 563.2 |  |  | $ | 267.2 |  |  | $ | 3,140.6 |
Adjustments | 0.2 |  |  | (0.8) |  |  | 0.4 |  |  | 0.2 |  |  | — |
Changes in foreign currency exchange rates | — |  |  | (12.8) |  |  | (3.6) |  |  | — |  |  | (16.4) |
Balance as of December 31, 2024 | $ | 306.0 |  |  | $ | 1,990.8 |  |  | $ | 560.0 |  |  | $ | 267.4 |  |  | $ | 3,124.2 |
Changes in foreign currency exchange rates | — |  |  | 7.3 |  |  | 19.0 |  |  | — |  |  | 26.3 |
Balance as of December 31, 2025 | $ | 306.0 |  |  | $ | 1,998.1 |  |  | $ | 579.0 |  |  | $ | 267.4 |  |  | $ | 3,150.5 |
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 |  | Digital |  | Total
Balance as of December 31, 2023 | $ | 134.1 |  |  | $ | 935.3 |  |  | $ | 352.5 |  |  | $ | 56.2 |  |  | $ | 83.4 |  |  | $ | 1,561.5 |
Additions | — |  |  | 1.2 |  |  | — |  |  | — |  |  | — |  |  | 1.2 |
Sales | — |  |  | — |  |  | — |  |  | — |  |  | (0.1) |  |  | (0.1) |
Amortization | (7.7) |  |  | (50.6) |  |  | (16.1) |  |  | (12.0) |  |  | (2.3) |  |  | (88.7) |
Changes in foreign currency exchange rates | — |  |  | (6.3) |  |  | (9.7) |  |  | — |  |  | — |  |  | (16.0) |
Impairment | — |  |  | — |  |  | — |  |  | — |  |  | (81.0) |  |  | (81.0) |
Balance as of December 31, 2024 | $ | 126.4 |  |  | $ | 879.6 |  |  | $ | 326.7 |  |  | $ | 44.2 |  |  | $ | — |  |  | $ | 1,376.9 |
Sales | — |  |  | (0.7) |  |  | — |  |  | — |  |  | — |  |  | (0.7) |
Amortization | (6.5) |  |  | (39.9) |  |  | (14.2) |  |  | (9.6) |  |  | — |  |  | (70.2) |
Changes in foreign currency exchange rates | — |  |  | 3.3 |  |  | 24.5 |  |  | — |  |  | — |  |  | 27.8 |
Impairment | — |  |  | (17.7) |  |  | (18.9) |  |  | — |  |  | — |  |  | (36.6) |
Balance as of December 31, 2025 | $ | 119.9 |  |  | $ | 824.6 |  |  | $ | 318.1 |  |  | $ | 34.6 |  |  | $ | — |  |  | $ | 1,297.2 |
Schedule of categories of intangible assets by segment | The following tables present the categories of intangible assets by segment as of December 31, 2025 and 2024 (in millions, except as stated):
| December 31, 2025 |  | Weighted Average Amortization Period (in years)
| Options |  | North American Equities |  | Europe and Asia Pacific |  | Global FX |  |  |
Trading registrations and licenses | $ | 95.5 |  |  | $ | 586.9 |  |  | $ | 219.4 |  |  | $ | — |  |  |  |  | Indefinite
Customer relationships | 46.6 |  |  | 412.1 |  |  | 204.7 |  |  | 140.0 |  |  |  |  | 13
Market data customer relationships | 53.6 |  |  | 322.0 |  |  | 65.1 |  |  | 64.4 |  |  |  |  | 6
Technology | 27.9 |  |  | 55.5 |  |  | 35.7 |  |  | 22.5 |  |  |  |  | 6
Trademarks and tradenames | 12.9 |  |  | 8.2 |  |  | 2.5 |  |  | 1.2 |  |  |  |  | 4
Digital assets held | — |  |  | 0.7 |  |  | — |  |  | — |  |  |  |  | Indefinite
Accumulated amortization | (116.6) |  |  | (560.8) |  |  | (209.3) |  |  | (193.5) |  |  |  |  |
| $ | 119.9 |  |  | $ | 824.6 |  |  | $ | 318.1 |  |  | $ | 34.6 |  |  |  |  |
| 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 tradenames | 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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