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INVESTMENTS - Deconsolidation Impacts on Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt and Equity Securities, FV-NI [Line Items]
Net increase (decrease) in assets of consolidated sponsored investment products	$ (371.7)	$ (568.7)	$ (643.5)	$ (650.1)
Net increase (decrease) in liabilities of consolidated sponsored investment products	(14.6)	(10.4)	(19.5)	(43.5)
Net increase (decrease) in redeemable non-controlling interests	(160.6)	(466.1)	(256.8)	(460.2)
Gains recognized upon deconsolidation	212.5	2.8	481.7	244.4
Reclassification out of accumulated other comprehensive income | Currency translation adjustments
Debt and Equity Securities, FV-NI [Line Items]
Gains recognized upon deconsolidation	$ (0.6)	$ 0.7	$ (0.6)	$ 0.7

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Increase (Decrease) In Assets Of Voting Interest Entities And Variable Interest Entities

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Increase (Decrease) In Liabilities Of Voting Interest Entities And Variable Interest Entities

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- Definition

Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

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-Name Accounting Standards Codification
-Topic 810
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-Topic 220
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-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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-Topic 820
-SubTopic 10
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