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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Net revenues	$ 6,488.4	$ 7,671.9	$ 6,206.7
Average assets under management	1,398,400.0	1,599,300.0	1,247,900.0
Period end assets under management	1,274,700.0	1,687,800.0
U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	3,916.7	4,842.6	4,042.5
Average assets under management	705,700.0	856,600.0	687,700.0
Period end assets under management	627,800.0	871,400.0
U.S. mutual funds | Equity
Disaggregation of Revenue [Line Items]
Average assets under management	424,900.0	540,400.0	417,000.0
Period end assets under management	369,800.0	553,900.0
U.S. mutual funds | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Average assets under management	81,000.0	86,400.0	76,800.0
Period end assets under management	73,800.0	85,300.0
U.S. mutual funds | Multi-asset
Disaggregation of Revenue [Line Items]
Average assets under management	199,800.0	229,800.0	193,900.0
Period end assets under management	184,200.0	232,200.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products
Disaggregation of Revenue [Line Items]
Net revenues	2,444.7	2,709.2	2,053.2
Average assets under management	692,700.0	742,700.0	560,200.0
Period end assets under management	646,900.0	816,400.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity
Disaggregation of Revenue [Line Items]
Average assets under management	338,700.0	431,600.0	321,300.0
Period end assets under management	294,400.0	438,800.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Average assets under management	92,400.0	91,300.0	82,100.0
Period end assets under management	93,200.0	90,400.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset
Disaggregation of Revenue [Line Items]
Average assets under management	218,900.0	219,800.0	156,800.0
Period end assets under management	215,900.0	245,500.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Alternatives
Disaggregation of Revenue [Line Items]
Average assets under management	42,700.0	0.0	0.0
Period end assets under management	43,400.0	41,700.0
Other clients
Disaggregation of Revenue [Line Items]
Net revenues	127.0	120.1	111.0
Investment advisory fees
Disaggregation of Revenue [Line Items]
Net revenues	5,969.1	7,098.1	5,693.1
Investment advisory fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	3,486.2	4,388.9	3,639.9
Investment advisory fees | U.S. mutual funds | Equity
Disaggregation of Revenue [Line Items]
Net revenues	2,415.3	3,118.5	2,440.4
Investment advisory fees | U.S. mutual funds | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Net revenues	261.4	245.2	266.5
Investment advisory fees | U.S. mutual funds | Multi-asset
Disaggregation of Revenue [Line Items]
Net revenues	809.5	1,025.2	933.0
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Disaggregation of Revenue [Line Items]
Net revenues	2,482.9	2,709.2	2,053.2
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity and blended assets
Disaggregation of Revenue [Line Items]
Net revenues	1,344.4	1,781.4	1,326.3
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Net revenues	166.0	164.6	149.3
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset
Disaggregation of Revenue [Line Items]
Net revenues	699.4	763.2	577.6
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Alternatives
Disaggregation of Revenue [Line Items]
Net revenues	273.1	0.0	0.0
Investment advisory fees | Other clients
Disaggregation of Revenue [Line Items]
Net revenues	0.0	0.0	0.0
Administrative fees
Disaggregation of Revenue [Line Items]
Net revenues	481.4	453.5	402.3
Administrative fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	338.3	333.4	291.3
Administrative fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Disaggregation of Revenue [Line Items]
Net revenues	16.1	0.0	0.0
Administrative fees | Other clients
Disaggregation of Revenue [Line Items]
Net revenues	127.0	120.1	111.0
Distribution and servicing fees
Disaggregation of Revenue [Line Items]
Net revenues	92.2	120.3	111.3
Distribution and servicing fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	92.2	120.3	111.3
Distribution and servicing fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Disaggregation of Revenue [Line Items]
Net revenues	0.0	0.0	0.0
Distribution and servicing fees | Other clients
Disaggregation of Revenue [Line Items]
Net revenues	0.0	0.0	0.0
Capital allocation-based income
Disaggregation of Revenue [Line Items]
Net revenues	(54.3)	$ 0.0	$ 0.0
Capital allocation-based income | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	0.0
Capital allocation-based income | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Disaggregation of Revenue [Line Items]
Net revenues	(54.3)
Capital allocation-based income | Other clients
Disaggregation of Revenue [Line Items]
Net revenues	$ 0.0

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