CONSOLIDATED INVESTMENT PRODUCTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Condensed Income Statements, Captions [Line Items]
Operating expenses	$ 1,250.3	$ 1,172.0	$ 3,662.9	$ 3,504.2
Net cash provided by (used in) financing activities			(785.6)	(728.2)
Consolidation eliminations
Condensed Income Statements, Captions [Line Items]
Operating expenses	$ 0.8	$ 1.3	3.6	3.0
Net cash provided by (used in) financing activities			$ (134.8)	$ 15.3