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ACQUISITIONS (Details) $ in Millions, € in Billions				3 Months Ended		6 Months Ended
	Dec. 31, 2020 USD ($)	Aug. 04, 2020 USD ($)	Jul. 01, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jul. 01, 2020 EUR (€)
Acquisitions
Contingent consideration liabilities	$ 32.7			$ 26.6		$ 26.6
Compensation and benefits				67.7	$ 54.9	140.0	$ 108.2
Acquisition-related costs				1.8	9.4	5.2	10.2
Professional fees				22.4	12.3	38.0	27.2
Credit Facility
Acquisitions
Debt instrument face amount | €								€ 1.5
Acquisitions
Acquisitions
Acquisition-related costs				1.8	9.4	5.2	10.2
Professional fees				$ 1.8	1.3	4.6	2.1
Impairment of investment					$ 8.1	$ 0.6	$ 8.1
EuroCCP
Acquisitions
Intangibles			$ 32.3
Working capital			$ 56.0
Ownership interest acquired (as a percent)			80.00%					80.00%
Bargain purchase gain			$ 32.6
EuroCCP | Credit Facility
Acquisitions
Debt instrument face amount | €								€ 1.5
Hanweck, FT Options, Trade Alert, and MATCHNow
Acquisitions
Goodwill		$ 100.7
Intangibles		59.0
Working capital		2.2
Contingent consideration liabilities		$ 32.7
BIDS Holdings
Acquisitions
Goodwill	100.0
Intangibles	156.4
Working capital	$ 23.3

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