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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by category (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Intangible Assets |  |  |
Intangible assets, net | $ 1,297.2 | $ 1,376.9 | $ 1,561.5
Customer relationships | Weighted Average Amortization Period (in years) |  |  |
Intangible Assets |  |  |
Weighted Average Amortization Period (in years) | 13 years | 14 years |
Market data customer relationships | Weighted Average Amortization Period (in years) |  |  |
Intangible Assets |  |  |
Weighted Average Amortization Period (in years) | 6 years | 7 years |
Technology | Weighted Average Amortization Period (in years) |  |  |
Intangible Assets |  |  |
Weighted Average Amortization Period (in years) | 6 years | 7 years |
Trademarks and tradenames | Weighted Average Amortization Period (in years) |  |  |
Intangible Assets |  |  |
Weighted Average Amortization Period (in years) | 4 years | 5 years |
Options |  |  |
Intangible Assets |  |  |
Accumulated amortization | $ (116.6) | $ (110.3) |
Intangible assets, net | 119.9 | 126.4 | 134.1
Options | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 46.6 | 46.6 |
Options | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 53.6 | 53.6 |
Options | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 27.9 | 28.1 |
Options | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 12.9 | 12.9 |
Options | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 95.5 | 95.5 |
Options | Digital assets held |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 0.0 | 0.0 |
North American Equities |  |  |
Intangible Assets |  |  |
Accumulated amortization | (560.8) | (520.3) |
Intangible assets, net | 824.6 | 879.6 | 935.3
North American Equities | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 412.1 | 409.7 |
North American Equities | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 322.0 | 322.0 |
North American Equities | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 55.5 | 55.5 |
North American Equities | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 8.2 | 8.1 |
North American Equities | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 586.9 | 603.4 |
North American Equities | Digital assets held |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 0.7 | 1.2 |
Europe and Asia Pacific |  |  |
Intangible Assets |  |  |
Accumulated amortization | (209.3) | (184.4) |
Intangible assets, net | 318.1 | 326.7 | 352.5
Europe and Asia Pacific | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 204.7 | 209.2 |
Europe and Asia Pacific | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 65.1 | 60.8 |
Europe and Asia Pacific | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 35.7 | 33.6 |
Europe and Asia Pacific | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 2.5 | 2.3 |
Europe and Asia Pacific | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 219.4 | 205.2 |
Europe and Asia Pacific | Digital assets held |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 0.0 | 0.0 |
Global FX |  |  |
Intangible Assets |  |  |
Accumulated amortization | (193.5) | (183.9) |
Intangible assets, net | 34.6 | 44.2 | $ 56.2
Global FX | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 140.0 | 140.0 |
Global FX | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 64.4 | 64.4 |
Global FX | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 22.5 | 22.5 |
Global FX | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 1.2 | 1.2 |
Global FX | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 0.0 | 0.0 |
Global FX | Digital assets held |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | $ 0.0 | $ 0.0 |

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