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CONSOLIDATED INVESTMENT PRODUCTS - Beginning and Ending Fair Value Measurements for Level 3 Assets and Liabilities (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance as of July 1	$ 495.2	$ 328.4	$ 383.1	$ 825.8
CIP Purchases	88.2	38.5	331.5	338.7
CIP Sales	(78.7)	(39.7)	(212.1)	(113.9)
Deconsolidation/Consolidation of CIP	54.5	0.0	54.5	(724.9)
Gains and losses included in the Consolidated Statements of Income	(5.4)	2.0	(23.3)	(17.2)
Transfers from Level 3 into Levels 1 or 2	(118.1)	(19.7)	(288.2)	(94.0)
Transfers into Level 3 from Levels 1 or 2	74.9	78.4	258.2	174.0
Foreign exchange	(4.8)	2.5	2.1	1.9
Ending Balance as of September 30	$ 505.8	$ 390.4	$ 505.8	$ 390.4

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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