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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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