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GOODWILL AND INTANGIBLE ASSETS, NET - Intangible assets by segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets
Balance at beginning of the year	$ 1,729.0	$ 1,589.9
Additions	73.8	247.7
Amortization	(126.6)	(124.8)	$ (138.6)
Changes in foreign currency exchange rates	(7.6)	16.2
Balance at end of the year	1,668.6	1,729.0	1,589.9
Options
Intangible Assets
Balance at beginning of the year	173.4	166.6
Additions		22.3
Amortization	(14.3)	(15.5)
Balance at end of the year	159.1	173.4	166.6
North American Equities
Intangible Assets
Balance at beginning of the year	1,055.5	921.4
Additions		193.1
Amortization	(64.4)	(61.0)
Changes in foreign currency exchange rates	0.3	2.0
Balance at end of the year	991.4	1,055.5	921.4
Europe and Asia Pacific
Intangible Assets
Balance at beginning of the year	386.8	363.7
Additions	73.8	32.3
Amortization	(26.3)	(23.4)
Changes in foreign currency exchange rates	(7.9)	14.2
Balance at end of the year	426.4	386.8	363.7
Global FX
Intangible Assets
Balance at beginning of the year	113.3	138.2
Amortization	(21.6)	(24.9)
Balance at end of the year	$ 91.7	$ 113.3	$ 138.2

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition, excluding goodwill.

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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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