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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | $ 1,595.8 | $ 1,426.7 | $ 4,473.8 | $ 4,149.2 |
Average assets under management | 1,292,900.0 | 1,130,200.0 | 1,198,900.0 | 1,091,500.0 |
Period end assets under management | 1,310,400.0 |  | 1,310,400.0 |  | $ 1,206,800.0
U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 1,040.4 | 980.1 | 2,939.9 | 2,863.3 |
Average assets under management | 708,800.0 | 650,500.0 | 664,000.0 | 633,200.0 |
Period end assets under management | 716,200.0 |  | 716,200.0 |  | 682,700.0
U.S. mutual funds | Equity |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 433,400.0 | 384,400.0 | 398,900.0 | 371,500.0 |
Period end assets under management | 442,300.0 |  | 442,300.0 |  | 407,100.0
U.S. mutual funds | Fixed income, including money market |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 78,100.0 | 73,300.0 | 76,000.0 | 71,300.0 |
Period end assets under management | 77,600.0 |  | 77,600.0 |  | 73,700.0
U.S. mutual funds | Multi-asset |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 197,300.0 | 192,800.0 | 189,100.0 | 190,400.0 |
Period end assets under management | 196,300.0 |  | 196,300.0 |  | 201,900.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 529.8 | 422.4 | 1,452.1 | 1,210.2 |
Average assets under management | 584,100.0 | 479,700.0 | 534,900.0 | 458,300.0 |
Period end assets under management | 594,200.0 |  | 594,200.0 |  | 524,100.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 338,800.0 | 262,400.0 | 303,300.0 | 251,100.0 |
Period end assets under management | 343,500.0 |  | 343,500.0 |  | 291,700.0
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 | 82,400.0 | 80,900.0 | 80,300.0 | 78,900.0 |
Period end assets under management | 83,500.0 |  | 83,500.0 |  | 74,200.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Average assets under management | 162,900.0 | 136,400.0 | 151,300.0 | 128,300.0 |
Period end assets under management | 167,200.0 |  | 167,200.0 |  | $ 158,200.0
Other clients |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 25.6 | 24.2 | 81.8 | 75.7 |
Investment advisory fees |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 1,469.3 | 1,303.4 | 4,090.9 | 3,767.8 |
Investment advisory fees | U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 939.5 | 881.0 | 2,638.8 | 2,557.6 |
Investment advisory fees | U.S. mutual funds | Equity |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 636.3 | 570.2 | 1,750.6 | 1,641.4 |
Investment advisory fees | U.S. mutual funds | Fixed income, including money market |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 66.6 | 70.7 | 205.1 | 208.6 |
Investment advisory fees | U.S. mutual funds | Multi-asset |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 236.6 | 240.1 | 683.1 | 707.6 |
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 529.8 | 422.4 | 1,452.1 | 1,210.2 |
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 339.6 | 259.5 | 924.7 | 751.0 |
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 | 38.4 | 39.7 | 110.3 | 116.0 |
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 151.8 | 123.2 | 417.1 | 343.2 |
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 | 98.0 | 93.2 | 300.8 | 291.0 |
Administrative fees | U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 72.4 | 69.0 | 219.0 | 215.3 |
Administrative 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 |
Administrative fees | Other clients |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 25.6 | 24.2 | 81.8 | 75.7 |
Distribution and servicing fees |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 28.5 | 30.1 | 82.1 | 90.4 |
Distribution and servicing fees | U.S. mutual funds |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Net revenues | 28.5 | 30.1 | 82.1 | 90.4 |
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 |

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