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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Intangible Assets
Balance at beginning of the period			$ 1,662.8
Dispositions			(0.8)
Amortization	$ (28.2)	$ (30.6)	(88.4)	$ (91.0)
Changes in foreign currency exchange rates			(2.3)
Balance at end of the period	1,571.3		1,571.3
Options
Intangible Assets
Balance at beginning of the period			146.1
Amortization			(9.0)
Balance at end of the period	137.1		137.1
North American Equities
Intangible Assets
Balance at beginning of the period			992.8
Amortization			(44.5)
Changes in foreign currency exchange rates			(0.4)
Balance at end of the period	947.9		947.9
Europe and Asia Pacific
Intangible Assets
Balance at beginning of the period			359.9
Amortization			(17.0)
Changes in foreign currency exchange rates			(1.9)
Balance at end of the period	341.0		341.0
Global FX
Intangible Assets
Balance at beginning of the period			72.8
Amortization			(12.6)
Balance at end of the period	60.2		60.2
Digital
Intangible Assets
Balance at beginning of the period			91.2
Dispositions			(0.8)
Amortization			(5.3)
Balance at end of the period	$ 85.1		$ 85.1

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- Definition

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

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Intangible Assets Disposed

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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
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
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-Section 45
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
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