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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue and Services [Line Items]
Net revenues	$ 1,733.3	$ 1,610.2	$ 3,483.5	$ 3,147.8
Investment advisory fees
Revenue and Services [Line Items]
Net revenues	1,585.6	1,430.8	3,139.6	2,822.6
Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	1,534,000.0	1,357,400.0	1,509,200.0	1,340,200.0
Capital allocation-based income
Revenue and Services [Line Items]
Net revenues	0.1	38.7	47.2	55.6
Administrative, distribution, and servicing fees
Revenue and Services [Line Items]
Net revenues	147.6	140.7	296.7	269.6
Equity | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	790,400.0	703,400.0	780,400.0	695,200.0
Fixed income, including money market | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	174,800.0	170,400.0	172,100.0	170,000.0
Multi-asset | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	520,100.0	439,000.0	508,600.0	430,700.0
Alternatives | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	48,700.0	44,600.0	48,100.0	44,300.0
Investment advisory fees | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	1,585.6	1,430.8	3,139.6	2,822.6
Investment advisory fees | Equity | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	948.9	862.3	1,898.5	1,696.2
Investment advisory fees | Fixed income, including money market | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	100.2	100.0	200.8	202.4
Investment advisory fees | Multi-asset | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	444.8	391.3	874.5	777.3
Investment advisory fees | Alternatives | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	$ 91.7	$ 77.2	$ 165.8	$ 146.7

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