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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by category (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Intangible Assets |  |
Intangible assets, net | $ 1,424.7 | $ 1,561.5
Customer relationships | Weighted Average |  |
Intangible Assets |  |
Amortization period (in years) | 15 years | 15 years
Market data customer relationships | Weighted Average |  |
Intangible Assets |  |
Amortization period (in years) | 8 years | 8 years
Technology | Weighted Average |  |
Intangible Assets |  |
Amortization period (in years) | 6 years | 7 years
Trademarks and tradenames | Weighted Average |  |
Intangible Assets |  |
Amortization period (in years) | 6 years | 6 years
Options |  |
Intangible Assets |  |
Accumulated amortization | $ (106.8) | $ (102.6)
Intangible assets, net | 129.9 | 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 | 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 | (497.1) | (471.7)
Intangible assets, net | 907.7 | 935.3
North American Equities | Customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 412.3 | 413.9
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 | 56.3 | 56.9
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 | 605.0 | 606.0
North American Equities | Digital assets held |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | 1.0 |
Europe and Asia Pacific |  |
Intangible Assets |  |
Accumulated amortization | (178.0) | (171.4)
Intangible assets, net | 337.2 | 352.5
Europe and Asia Pacific | Customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 211.4 | 216.1
Europe and Asia Pacific | Market data customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 61.0 | 61.6
Europe and Asia Pacific | Technology |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 33.8 | 34.2
Europe and Asia Pacific | Trademarks and tradenames |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 2.4 | 2.4
Europe and Asia Pacific | Trading registrations and licenses |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | 206.6 | 209.6
Global FX |  |
Intangible Assets |  |
Accumulated amortization | (178.3) | (171.9)
Intangible assets, net | 49.8 | 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
Digital |  |
Intangible Assets |  |
Accumulated amortization |  | (11.7)
Intangible assets, net | 0.1 | 83.4
Digital | Technology |  |
Intangible Assets |  |
Finite-lived intangible assets, gross |  | 70.0
Digital | Trading registrations and licenses |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross |  | 25.0
Digital | Digital assets held |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | $ 0.1 | $ 0.1

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