CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Condensed Income Statements, Captions [Line Items]
Operating expenses	$ 1,053.4	$ 985.6
Net cash provided by financing activities	(144.2)	(644.1)
Consolidation eliminations
Condensed Income Statements, Captions [Line Items]
Operating expenses	0.6	0.9
Net cash provided by financing activities	$ 4.4	$ 35.1

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3521-108585

Name:	us-gaap_NetCashProvidedByUsedInFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration