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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue and Services [Line Items]
Net revenues	$ 1,763.9	$ 1,750.2
Investment advisory fees
Revenue and Services [Line Items]
Net revenues	1,598.4	1,536.4
Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	1,620,300.0	1,484,400.0
Performance-based advisory fees
Revenue and Services [Line Items]
Net revenues	10.4	17.6
Capital allocation-based income
Revenue and Services [Line Items]
Net revenues	(1.2)	47.1
Administrative, distribution, services, and other fees
Revenue and Services [Line Items]
Net revenues	156.3	149.1
Equity | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	826,300.0	770,400.0
Fixed income, including money market | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	191,600.0	169,500.0
Multi-asset | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	549,700.0	497,000.0
Alternatives | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	52,700.0	47,500.0
Investment advisory fees | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	1,598.4	1,536.4
Investment advisory fees | Equity | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	959.2	932.5
Investment advisory fees | Fixed income, including money market | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	103.6	100.2
Investment advisory fees | Multi-asset | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	454.7	429.7
Investment advisory fees | Alternatives | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	$ 80.9	$ 74.0

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