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GOODWILL AND INTANGIBLE ASSETS, NET - Schedule of intangible assets by category (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Intangible Assets
Intangible assets, net	$ 1,698.1	$ 1,729.0
Customer relationships | Weighted Average
Intangible Assets
Amortization period (in years)	16 years	16 years
Market data customer relationships | Weighted Average
Intangible Assets
Amortization period (in years)	11 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)	9 years	9 years
Options
Intangible Assets
Accumulated amortization	$ (67.1)	$ (63.3)
Intangible assets, net	169.6	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 | Trading registrations and licenses
Intangible Assets
Indefinite-lived intangible assets, gross	95.5	95.5
North American Equities
Intangible Assets
Accumulated amortization	(302.8)	(285.7)
Intangible assets, net	1,038.8	1,055.5
North American Equities | Customer relationships
Intangible Assets
Finite-lived intangible assets, gross	378.5	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	592.2	592.0
Europe
Intangible Assets
Accumulated amortization	(112.4)	(105.3)
Intangible assets, net	382.2	386.8
Europe | Customer relationships
Intangible Assets
Finite-lived intangible assets, gross	177.2	175.7
Europe | Market data customer relationships
Intangible Assets
Finite-lived intangible assets, gross	66.5	65.9
Europe | Technology
Intangible Assets
Finite-lived intangible assets, gross	28.7	28.6
Europe | Trademarks and tradenames
Intangible Assets
Finite-lived intangible assets, gross	2.6	2.6
Europe | Trading registrations and licenses
Intangible Assets
Indefinite-lived intangible assets, gross	219.6	219.3
Global FX
Intangible Assets
Accumulated amortization	(120.6)	(114.8)
Intangible assets, net	107.5	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

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