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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net revenues	$ 7,671.9	$ 6,206.7	$ 5,617.9
Average assets under management	1,599,300.0	1,247,900.0	1,109,300.0
Period end assets under management	1,640,900.0	1,470,500.0
U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	4,842.6	4,042.5	3,854.3
Average assets under management	856,600.0	687,700.0	640,400.0
Period end assets under management	871,400.0	794,600.0
U.S. mutual funds | Equity
Disaggregation of Revenue [Line Items]
Average assets under management	540,400.0	417,000.0	376,300.0
Period end assets under management	553,900.0	498,600.0
U.S. mutual funds | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Average assets under management	86,400.0	76,800.0	72,000.0
Period end assets under management	85,300.0	79,400.0
U.S. mutual funds | Multi-asset
Disaggregation of Revenue [Line Items]
Average assets under management	229,800.0	193,900.0	192,100.0
Period end assets under management	232,200.0	216,600.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products
Disaggregation of Revenue [Line Items]
Net revenues	2,709.2	2,053.2	1,660.0
Average assets under management	742,700.0	560,200.0	468,900.0
Period end assets under management	769,500.0	675,900.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity
Disaggregation of Revenue [Line Items]
Average assets under management	431,600.0	321,300.0	257,300.0
Period end assets under management	438,800.0	397,200.0
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	91,300.0	82,100.0	79,500.0
Period end assets under management	85,200.0	89,300.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset
Disaggregation of Revenue [Line Items]
Average assets under management	219,800.0	156,800.0	132,100.0
Period end assets under management	245,500.0	189,400.0
Other clients
Disaggregation of Revenue [Line Items]
Net revenues	120.1	111.0	103.6
Investment advisory fees
Disaggregation of Revenue [Line Items]
Net revenues	7,098.1	5,693.1	5,112.5
Investment advisory fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	4,388.9	3,639.9	3,452.5
Investment advisory fees | U.S. mutual funds | Equity
Disaggregation of Revenue [Line Items]
Net revenues	3,118.5	2,440.4	2,219.1
Investment advisory fees | U.S. mutual funds | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Net revenues	245.2	266.5	280.1
Investment advisory fees | U.S. mutual funds | Multi-asset
Disaggregation of Revenue [Line Items]
Net revenues	1,025.2	933.0	953.3
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Disaggregation of Revenue [Line Items]
Net revenues	2,709.2	2,053.2	1,660.0
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	1,781.4	1,326.3	1,033.4
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	164.6	149.3	153.7
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset
Disaggregation of Revenue [Line Items]
Net revenues	763.2	577.6	472.9
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	453.5	402.3	385.4
Administrative fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	333.4	291.3	281.8
Administrative 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
Administrative fees | Other clients
Disaggregation of Revenue [Line Items]
Net revenues	120.1	111.0	103.6
Distribution and servicing fees
Disaggregation of Revenue [Line Items]
Net revenues	120.3	111.3	120.0
Distribution and servicing fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues	120.3	111.3	120.0
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

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