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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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