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CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Income Statements, Captions [Line Items]
Investment advisory and administrative fees	$ (6,460.5)	$ (6,488.4)	$ (7,671.9)
Net cash provided by financing activities	(1,078.6)	(2,076.9)	(2,988.8)
Consolidation eliminations
Condensed Income Statements, Captions [Line Items]
Investment advisory and administrative fees	2.1	2.0	5.5
Net cash provided by financing activities	$ 544.6	$ 142.8	$ 51.9

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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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