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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible Assets by Category (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Intangible Assets |  |
Intangible assets, net | $ 1,330.3 | $ 1,376.9
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) | 7 years | 7 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) | 4 years | 5 years
Options |  |
Intangible Assets |  |
Accumulated amortization | $ (115.1) | $ (110.3)
Intangible assets, net | 121.6 | 126.4
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 | (551.5) | (520.3)
Intangible assets, net | 851.2 | 879.6
North American Equities | Customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 411.4 | 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 | 56.0 | 55.5
North American Equities | Trademarks and trade names |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 8.1 | 8.1
North American Equities | Trading registrations and licenses |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | 604.4 | 603.4
North American Equities | Digital assets held |  |
Intangible Assets |  |
Indefinite-lived intangible assets, gross | 0.8 | 1.2
Europe and Asia Pacific |  |
Intangible Assets |  |
Accumulated amortization | (204.8) | (184.4)
Intangible assets, net | 320.6 | 326.7
Europe and Asia Pacific | Customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 203.8 | 209.2
Europe and Asia Pacific | Market data customer relationships |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 64.9 | 60.8
Europe and Asia Pacific | Technology |  |
Intangible Assets |  |
Finite-lived intangible assets, gross | 35.6 | 33.6
Europe and Asia Pacific | Trademarks and trade names |  |
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 | 218.6 | 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 | (191.2) | (183.9)
Intangible assets, net | 36.9 | 44.2
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

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