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GOODWILL AND INTANGIBLE ASSETS, NET - Intangible assets by category (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Intangible Assets
Intangible assets, net	$ 1,628.6	$ 1,668.6
Customer relationships | Weighted Average
Intangible Assets
Amortization period (in years)	17 years	17 years
Market data customer relationships | Weighted Average
Intangible Assets
Amortization period (in years)	10 years	10 years
Technology | Weighted Average
Intangible Assets
Amortization period (in years)	4 years	5 years
Trademarks and tradenames | Weighted Average
Intangible Assets
Amortization period (in years)	8 years	8 years
Options
Intangible Assets
Accumulated amortization	$ (80.9)	$ (77.6)
Intangible assets, net	155.7	159.1
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	12.8	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	(365.2)	(349.8)
Intangible assets, net	976.7	991.4
North American Equities | Customer relationships
Intangible Assets
Finite-lived intangible assets, gross	378.6	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	41.1	41.1
North American Equities | Trademarks and tradenames
Intangible Assets
Finite-lived intangible assets, gross	7.8	7.8
North American Equities | Trading registrations and licenses
Intangible Assets
Indefinite-lived intangible assets, gross	592.4	592.0
Europe and Asia Pacific
Intangible Assets
Accumulated amortization	(133.5)	(130.3)
Intangible assets, net	409.6	426.4
Europe and Asia Pacific | Customer relationships
Intangible Assets
Finite-lived intangible assets, gross	227.1	232.3
Europe and Asia Pacific | Market data customer relationships
Intangible Assets
Finite-lived intangible assets, gross	63.4	65.2
Europe and Asia Pacific | Technology
Intangible Assets
Finite-lived intangible assets, gross	34.8	35.6
Europe and Asia Pacific | Trademarks and tradenames
Intangible Assets
Finite-lived intangible assets, gross	2.5	2.5
Europe and Asia Pacific | Trading registrations and licenses
Intangible Assets
Indefinite-lived intangible assets, gross	215.3	221.1
Global FX
Intangible Assets
Accumulated amortization	(141.5)	(136.4)
Intangible assets, net	86.6	91.7
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

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