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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | $ 1,588.2 | $ 1,954.1 | $ 4,964.2 | $ 5,710.2 |
Average assets under management | 1,347,500.0 | 1,648,700.0 | 1,437,100.0 | 1,581,300.0 |
Period end assets under management | 1,230,000.0 |  | 1,230,000.0 |  | $ 1,687,800.0
U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 950.2 | 1,239.0 | 3,031.0 | 3,606.3 |
Average assets under management | 677,600.0 | 881,000.0 | 728,500.0 | 848,100.0 |
Period end assets under management | 614,500.0 |  | 614,500.0 |  | 871,400.0
U.S. mutual funds | Equity |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 405,800.0 | 559,800.0 | 441,000.0 | 534,000.0 |
Period end assets under management | 365,200.0 |  | 365,200.0 |  | 553,900.0
U.S. mutual funds | Fixed income, including money market |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 79,400.0 | 88,400.0 | 82,700.0 | 85,600.0 |
Period end assets under management | 74,500.0 |  | 74,500.0 |  | 85,300.0
U.S. mutual funds | Multi-asset |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 192,400.0 | 232,800.0 | 204,800.0 | 228,500.0 |
Period end assets under management | 174,800.0 |  | 174,800.0 |  | 232,200.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 606.4 | 687.9 | 1,838.1 | 2,015.2 |
Average assets under management | 669,900.0 | 767,700.0 | 708,600.0 | 733,200.0 |
Period end assets under management | 615,500.0 |  | 615,500.0 |  | 816,400.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 319,100.0 | 445,700.0 | 352,000.0 | 427,300.0 |
Period end assets under management | 282,600.0 |  | 282,600.0 |  | 438,800.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Fixed income, including money market |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 93,600.0 | 94,300.0 | 92,400.0 | 92,100.0 |
Period end assets under management | 90,900.0 |  | 90,900.0 |  | 90,400.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 214,300.0 | 227,700.0 | 221,800.0 | 213,800.0 |
Period end assets under management | 199,300.0 |  | 199,300.0 |  | 245,500.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Alternatives |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 42,900.0 | 0.0 | 42,400.0 | 0.0 |
Period end assets under management | 42,700.0 |  | 42,700.0 |  | $ 41,700.0
Other clients |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 31.6 | 27.2 | 95.1 | 88.7 |
Investment advisory fees |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 1,442.0 | 1,813.4 | 4,600.8 | 5,288.4 |
Investment advisory fees | U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 841.7 | 1,125.5 | 2,694.4 | 3,273.2 |
Investment advisory fees | U.S. mutual funds | Equity |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 580.1 | 813.0 | 1,876.5 | 2,310.8 |
Investment advisory fees | U.S. mutual funds | Fixed income, including money market |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 66.2 | 64.8 | 198.9 | 183.7 |
Investment advisory fees | U.S. mutual funds | Multi-asset |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 195.4 | 247.7 | 619.0 | 778.7 |
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 600.3 | 687.9 | 1,906.4 | 2,015.2 |
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 316.9 | 458.8 | 1,047.5 | 1,329.0 |
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Fixed income, including money market |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 41.4 | 41.3 | 125.2 | 119.6 |
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 171.8 | 187.8 | 530.3 | 566.6 |
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Alternatives |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 70.2 | 0.0 | 203.4 | 0.0 |
Investment advisory fees | Other clients |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Administrative fees |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 123.1 | 109.8 | 372.7 | 331.8 |
Administrative fees | U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 86.5 | 82.6 | 265.1 | 243.1 |
Administrative fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 5.0 | 0.0 | 12.5 | 0.0 |
Administrative fees | Other clients |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 31.6 | 27.2 | 95.1 | 88.7 |
Distribution and servicing fees |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 22.0 | 30.9 | 71.5 | 90.0 |
Distribution and servicing fees | U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 22.0 | 30.9 | 71.5 | 90.0 |
Distribution and servicing fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Distribution and servicing fees | Other clients |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Capital allocation-based income |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 1.1 | $ 0.0 | (80.8) | $ 0.0 |
Capital allocation-based income | U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 0.0 |  | 0.0 |  |
Capital allocation-based income | Subadvised funds, separate accounts, collective investment trusts, and other investment products |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 1.1 |  | (80.8) |  |
Capital allocation-based income | Other clients |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | $ 0.0 |  | $ 0.0 |  |

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