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GOODWILL AND INTANGIBLE ASSETS, NET - Schedule of intangible assets by segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Intangible Assets
Balance at beginning of the year			$ 1,729.0
Amortization	$ (30.6)	$ (30.1)	(63.5)	$ (62.6)
Changes in foreign currency exchange rates			4.9
Balance at end of the year	1,670.4		1,670.4
Options
Intangible Assets
Balance at beginning of the year			173.4
Amortization			(7.3)
Balance at end of the year	166.1		166.1
North American Equities
Intangible Assets
Balance at beginning of the year			1,055.5
Amortization			(33.0)
Changes in foreign currency exchange rates			1.2
Balance at end of the year	1,023.7		1,023.7
Europe
Intangible Assets
Balance at beginning of the year			386.8
Amortization			(12.1)
Changes in foreign currency exchange rates			3.7
Balance at end of the year	378.4		378.4
Global FX
Intangible Assets
Balance at beginning of the year			113.3
Amortization			(11.1)
Balance at end of the year	$ 102.2		$ 102.2

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Finite-lived and Indefinite-lived Intangible Assets [Roll Forward]

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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