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GOODWILL AND INTANGIBLE ASSETS, NET - Intangible assets by segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Intangible Assets
Balance at beginning of the period	$ 1,668.6
Amortization	(30.6)	$ (32.9)
Changes in foreign currency exchange rates	(9.4)
Balance at end of the period	1,628.6
Options
Intangible Assets
Balance at beginning of the period	159.1
Amortization	(3.4)
Balance at end of the period	155.7
North American Equities
Intangible Assets
Balance at beginning of the period	991.4
Amortization	(15.2)
Changes in foreign currency exchange rates	0.5
Balance at end of the period	976.7
Europe and Asia Pacific
Intangible Assets
Balance at beginning of the period	426.4
Amortization	(6.9)
Changes in foreign currency exchange rates	(9.9)
Balance at end of the period	409.6
Global FX
Intangible Assets
Balance at beginning of the period	91.7
Amortization	(5.1)
Balance at end of the period	$ 86.6

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- Definition

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

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Intangible Assets, Foreign Currency Translation Gain (Loss)

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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- Definition

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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