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GOODWILL AND INTANGIBLE ASSETS, NET - Itangible assets by category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets
Intangible assets, net	$ 1,668.6	$ 1,729.0	$ 1,589.9
Customer relationships | Weighted Average
Intangible Assets
Amortization period (in years)	17 years	16 years
Market data customer relationships | Weighted Average
Intangible Assets
Amortization period (in years)	10 years	11 years
Technology | Weighted Average
Intangible Assets
Amortization period (in years)	5 years	5 years
Trademarks and tradenames | Weighted Average
Intangible Assets
Amortization period (in years)	8 years	9 years
Options
Intangible Assets
Accumulated amortization	$ (77.6)	$ (63.3)
Intangible assets, net	159.1	173.4	166.6
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	(349.8)	(285.7)
Intangible assets, net	991.4	1,055.5	921.4
North American Equities | Customer relationships
Intangible Assets
Finite-lived intangible assets, gross	378.3	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	592.0	592.0
Europe and Asia Pacific
Intangible Assets
Accumulated amortization	(130.3)	(105.3)
Intangible assets, net	426.4	386.8	363.7
Europe and Asia Pacific | Customer relationships
Intangible Assets
Finite-lived intangible assets, gross	232.3	175.7
Europe and Asia Pacific | Market data customer relationships
Intangible Assets
Finite-lived intangible assets, gross	65.2	65.9
Europe and Asia Pacific | Technology
Intangible Assets
Finite-lived intangible assets, gross	35.6	28.6
Europe and Asia Pacific | Trademarks and tradenames
Intangible Assets
Finite-lived intangible assets, gross	2.5	2.6
Europe and Asia Pacific | Trading registrations and licenses
Intangible Assets
Indefinite-lived intangible assets, gross	221.1	219.3
Global FX
Intangible Assets
Accumulated amortization	(136.4)	(114.8)
Intangible assets, net	91.7	113.3	$ 138.2
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

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