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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue and Services [Line Items]
Net revenues	$ 7,093.6	$ 6,460.5	$ 6,488.4
Investment advisory fees
Revenue and Services [Line Items]
Net revenues	6,399.7	5,709.5	5,962.7
Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	1,561,900.0	1,362,300.0	1,398,400.0
Capital allocation-based income
Revenue and Services [Line Items]
Net revenues	46.6	161.9	(54.3)
Administrative, distribution, and servicing fees
Revenue and Services [Line Items]
Net revenues	588.0	550.9	573.6
Equity | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	804,300.0	705,200.0	763,600.0
Fixed income, including money market | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	178,600.0	169,300.0	173,400.0
Multi-asset | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	529,000.0	442,300.0	418,700.0
Alternatives | Investment advisory fees | Assets under management
Revenue and Services [Line Items]
Net revenues	50,000.0	45,500.0	42,700.0
Investment advisory fees | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	6,399.7	5,709.5	5,962.7
Investment advisory fees | Equity | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	3,864.7	3,442.3	3,758.4
Investment advisory fees | Fixed income, including money market | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	410.7	400.4	426.3
Investment advisory fees | Multi-asset | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	1,814.1	1,583.4	1,508.9
Investment advisory fees | Alternatives | Investment advisory fees
Revenue and Services [Line Items]
Net revenues	$ 310.2	$ 283.4	$ 269.1

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