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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by category (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Intangible Assets |  |  |
Intangible assets, net | $ 1,561.5 | $ 1,662.8 | $ 1,668.6
Customer relationships | Weighted Average |  |  |
Intangible Assets |  |  |
Amortization period (in years) | 15 years | 16 years |
Market data customer relationships | Weighted Average |  |  |
Intangible Assets |  |  |
Amortization period (in years) | 8 years | 9 years |
Technology | Weighted Average |  |  |
Intangible Assets |  |  |
Amortization period (in years) | 7 years | 8 years |
Trademarks and tradenames | Weighted Average |  |  |
Intangible Assets |  |  |
Amortization period (in years) | 6 years | 7 years |
Options |  |  |
Intangible Assets |  |  |
Accumulated amortization | $ (102.6) | $ (90.6) |
Intangible assets, net | 134.1 | 146.1 | 159.1
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 | 28.1 | 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 |
North American Equities |  |  |
Intangible Assets |  |  |
Accumulated amortization | (471.7) | (411.9) |
Intangible assets, net | 935.3 | 992.8 | 991.4
North American Equities | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 413.9 | 412.8 |
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 | 56.9 | 56.4 |
North American Equities | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 8.2 | 8.2 |
North American Equities | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 606.0 | 605.3 |
Europe and Asia Pacific |  |  |
Intangible Assets |  |  |
Accumulated amortization | (171.4) | (142.0) |
Intangible assets, net | 352.5 | 359.9 | 426.4
Europe and Asia Pacific | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 216.1 | 208.9 |
Europe and Asia Pacific | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 61.6 | 58.4 |
Europe and Asia Pacific | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 34.2 | 32.8 |
Europe and Asia Pacific | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 2.4 | 2.3 |
Europe and Asia Pacific | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 209.6 | 199.5 |
Global FX |  |  |
Intangible Assets |  |  |
Accumulated amortization | (171.9) | (155.3) |
Intangible assets, net | 56.2 | 72.8 | $ 91.7
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 |
Digital |  |  |
Intangible Assets |  |  |
Accumulated amortization | (11.7) | (4.7) |
Intangible assets, net | 83.4 | 91.2 |
Digital | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 70.0 | 70.0 |
Digital | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 25.0 | 25.0 |
Digital | Digital assets held |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | $ 0.1 | $ 0.9 |

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