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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by category (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Intangible Assets |  |
Intangible assets, net | $ 1,424.7 | $ 1,561.5
Customer relationships | Weighted Average Amortization Period (in years) |  |
Intangible Assets |  |
Weighted Average Amortization Period (in years) | 15 years | 15 years
Market data customer relationships | Weighted Average Amortization Period (in years) |  |
Intangible Assets |  |
Weighted Average Amortization Period (in years) | 8 years | 8 years
Technology | Weighted Average Amortization Period (in years) |  |
Intangible Assets |  |
Weighted Average Amortization Period (in years) | 6 years | 7 years
Trademarks and trade names | Weighted Average Amortization Period (in years) |  |
Intangible Assets |  |
Weighted Average Amortization Period (in years) | 5 years | 6 years
Options |  |
Intangible Assets |  |
Accumulated amortization | $ (108.6) | $ (102.6)
Intangible assets, net | 128.1 | 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 trade names |  |
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 | (509.9) | (471.7)
Intangible assets, net | 896.0 | 935.3
North American Equities | Customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 412.9 | 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 | 56.5 | 56.9
North American Equities | Trademarks and trade names |  |
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 | 605.3 | 606.0
North American Equities | Digital assets held |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | 1.0 | 0.0
Europe and Asia Pacific |  |
Intangible Assets |  |
Accumulated amortization | (191.7) | (171.4)
Intangible assets, net | 353.5 | 352.5
Europe and Asia Pacific | Customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 224.4 | 216.1
Europe and Asia Pacific | Market data customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 64.6 | 61.6
Europe and Asia Pacific | Technology |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 35.3 | 34.2
Europe and Asia Pacific | Trademarks and trade names |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 2.5 | 2.4
Europe and Asia Pacific | Trading registrations and licenses |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | 218.4 | 209.6
Europe and Asia Pacific | Digital assets held |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | 0.0 | 0.0
Global FX |  |
Intangible Assets |  |
Accumulated amortization | (181.0) | (171.9)
Intangible assets, net | 47.1 | 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 trade names |  |
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
Digital |  |
Intangible Assets |  |
Accumulated amortization | 0.0 | (11.7)
Intangible assets, net | 0.0 | 83.4
Digital | Customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 0.0 | 0.0
Digital | Market data customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 0.0 | 0.0
Digital | Technology |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 0.0 | 70.0
Digital | Trademarks and trade names |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 0.0 | 0.0
Digital | Trading registrations and licenses |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | 0.0 | 25.0
Digital | Digital assets held |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | $ 0.0 | $ 0.1

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