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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,468.7 | $ 1,426.7 | $ 1,395.2 | $ 1,327.3 | $ 1,305.0 | $ 1,394.6 | $ 1,345.0 | $ 1,328.0 | $ 5,617.9 | $ 5,372.6 | $ 4,854.9
Average assets under management |  |  |  |  |  |  |  |  | 1,109,300.0 | 1,036,500.0 | 909,000.0
Period end assets under management | 1,206,800.0 |  |  |  | 962,300.0 |  |  |  | 1,206,800.0 | 962,300.0 |
U.S. mutual funds |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 3,854.3 | 3,815.2 | 3,560.6
Average assets under management |  |  |  |  |  |  |  |  | 640,400.0 | 621,800.0 | 568,500.0
Period end assets under management | 682,700.0 |  |  |  | 564,500.0 |  |  |  | 682,700.0 | 564,500.0 |
U.S. mutual funds | Equity and blended assets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average assets under management |  |  |  |  |  |  |  |  | 513,600.0 | 493,600.0 | 447,500.0
Period end assets under management | 552,400.0 |  |  |  | 441,100.0 |  |  |  | 552,400.0 | 441,100.0 |
U.S. mutual funds | Fixed income, including money market |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average assets under management |  |  |  |  |  |  |  |  | 126,800.0 | 128,200.0 | 121,000.0
Period end assets under management | 130,300.0 |  |  |  | 123,400.0 |  |  |  | 130,300.0 | 123,400.0 |
Subadvised and separate accounts and other investment products |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 1,660.0 | 1,475.6 | 1,215.8
Average assets under management |  |  |  |  |  |  |  |  | 468,900.0 | 414,700.0 | 340,500.0
Period end assets under management | 524,100.0 |  |  |  | 397,800.0 |  |  |  | 524,100.0 | 397,800.0 |
Subadvised and separate accounts and other investment products | Equity and blended assets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average assets under management |  |  |  |  |  |  |  |  | 362,500.0 | 317,300.0 | 256,400.0
Period end assets under management | 412,100.0 |  |  |  | 299,200.0 |  |  |  | 412,100.0 | 299,200.0 |
Subadvised and separate accounts and other investment products | Fixed income, including money market |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average assets under management |  |  |  |  |  |  |  |  | 106,400.0 | 97,400.0 | 84,100.0
Period end assets under management | $ 112,000.0 |  |  |  | $ 98,600.0 |  |  |  | 112,000.0 | 98,600.0 |
Other clients |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 103.6 | 81.8 | 78.5
Investment advisory fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 5,112.5 | 4,850.6 | 4,295.8
Investment advisory fees | U.S. mutual funds |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 3,452.5 | 3,375.0 | 3,080.0
Investment advisory fees | U.S. mutual funds | Equity and blended assets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 2,952.2 | 2,858.1 | 2,571.7
Investment advisory fees | U.S. mutual funds | Fixed income, including money market |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 500.3 | 516.9 | 508.3
Investment advisory fees | Subadvised and separate accounts and other investment products |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 1,660.0 | 1,475.6 | 1,215.8
Investment advisory fees | Subadvised and separate accounts and other investment products | Equity and blended assets |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 1,405.0 | 1,236.8 | 1,009.4
Investment advisory fees | Subadvised and separate accounts and other investment products | Fixed income, including money market |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 255.0 | 238.8 | 206.4
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 |  |  |  |  |  |  |  |  | 385.4 | 384.0 | 412.1
Administrative fees | U.S. mutual funds |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 281.8 | 302.2 | 333.6
Administrative fees | Subadvised and separate accounts 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 |  |  |  |  |  |  |  |  | 103.6 | 81.8 | 78.5
Distribution and servicing fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 120.0 | 138.0 | 147.0
Distribution and servicing fees | U.S. mutual funds |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 120.0 | 138.0 | 147.0
Distribution and servicing fees | Subadvised and separate accounts 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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