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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Intangible Assets
Intangible assets, net	$ 1,662.8	$ 1,668.6	$ 1,729.0
Customer relationships | Weighted Average
Intangible Assets
Amortization period (in years)	16 years	17 years
Market data customer relationships | Weighted Average
Intangible Assets
Amortization period (in years)	9 years	10 years
Technology | Weighted Average
Intangible Assets
Amortization period (in years)	8 years	5 years
Trademarks and tradenames | Weighted Average
Intangible Assets
Amortization period (in years)	7 years	8 years
Options
Intangible Assets
Accumulated amortization	$ (90.6)	$ (77.6)
Intangible assets, net	146.1	159.1	173.4
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 tradenames
Intangible Assets
Finite-lived intangible assets, gross	12.9	12.9
Options | Licensing Agreements
Intangible Assets
Indefinite-lived intangible assets, gross	95.5	95.5
North American Equities
Intangible Assets
Accumulated amortization	(411.9)	(349.8)
Intangible assets, net	992.8	991.4	1,055.5
North American Equities | Customer relationships
Intangible Assets
Finite-lived intangible assets, gross	412.8	378.3
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	56.4	41.1
North American Equities | Trademarks and tradenames
Intangible Assets
Finite-lived intangible assets, gross	8.2	7.8
North American Equities | Licensing Agreements
Intangible Assets
Indefinite-lived intangible assets, gross	605.3	592.0
Europe and Asia Pacific
Intangible Assets
Accumulated amortization	(142.0)	(130.3)
Intangible assets, net	359.9	426.4	386.8
Europe and Asia Pacific | Customer relationships
Intangible Assets
Finite-lived intangible assets, gross	208.9	232.3
Europe and Asia Pacific | Market data customer relationships
Intangible Assets
Finite-lived intangible assets, gross	58.4	65.2
Europe and Asia Pacific | Technology
Intangible Assets
Finite-lived intangible assets, gross	32.8	35.6
Europe and Asia Pacific | Trademarks and tradenames
Intangible Assets
Finite-lived intangible assets, gross	2.3	2.5
Europe and Asia Pacific | Licensing Agreements
Intangible Assets
Indefinite-lived intangible assets, gross	199.5	221.1
Global FX
Intangible Assets
Accumulated amortization	(155.3)	(136.4)
Intangible assets, net	72.8	91.7	$ 113.3
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	(4.7)
Intangible assets, net	91.2
Digital | Technology
Intangible Assets
Finite-lived intangible assets, gross	70.0
Digital | Licensing Agreements
Intangible Assets
Indefinite-lived intangible assets, gross	25.0
Digital | Digital assets held
Intangible Assets
Indefinite-lived intangible assets, gross	$ 0.9

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