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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Revenue and Services [Line Items] |  |  |
Net revenues | $ 1,327.3 | $ 1,328.0 |
Average assets under management | 1,043,500.0 | 1,025,500.0 |
Period end assets under management | 1,081,700.0 |  | $ 962,300.0
U.S. mutual funds [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 922.7 | 951.3 |
Average assets under management | 610,100.0 | 622,000.0 |
Period end assets under management | 630,700.0 |  | 564,500.0
U.S. mutual funds [Member] | Equity and blended asset [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Average assets under management | 487,600.0 | 494,600.0 |
Period end assets under management | 506,600.0 |  | 441,100.0
U.S. mutual funds [Member] | Fixed income, including money market [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Average assets under management | 122,500.0 | 127,400.0 |
Period end assets under management | 124,100.0 |  | 123,400.0
Subadvised and separate accounts and other investment products [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 378.3 | 356.3 |
Average assets under management | 433,400.0 | 403,500.0 |
Period end assets under management | 451,000.0 |  | 397,800.0
Subadvised and separate accounts and other investment products [Member] | Equity and blended asset [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Average assets under management | 332,900.0 | 308,200.0 |
Period end assets under management | 347,900.0 |  | 299,200.0
Subadvised and separate accounts and other investment products [Member] | Fixed income, including money market [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Average assets under management | 100,500.0 | 95,300.0 |
Period end assets under management | 103,100.0 |  | $ 98,600.0
Other [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 26.3 | 20.4 |
Investment advisory fees [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 1,194.2 | 1,189.2 |
Investment advisory fees [Member] | U.S. mutual funds [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 815.9 | 832.9 |
Investment advisory fees [Member] | U.S. mutual funds [Member] | Equity and blended asset [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 694.5 | 705.5 |
Investment advisory fees [Member] | U.S. mutual funds [Member] | Fixed income, including money market [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 121.4 | 127.4 |
Investment advisory fees [Member] | Subadvised and separate accounts and other investment products [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 378.3 | 356.3 |
Investment advisory fees [Member] | Subadvised and separate accounts and other investment products [Member] | Equity and blended asset [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 318.8 | 297.0 |
Investment advisory fees [Member] | Subadvised and separate accounts and other investment products [Member] | Fixed income, including money market [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 59.5 | 59.3 |
Investment advisory fees [Member] | Other [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 0.0 | 0.0 |
Administrative service [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 102.9 | 102.2 |
Administrative service [Member] | U.S. mutual funds [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 76.6 | 81.8 |
Administrative service [Member] | Subadvised and separate accounts and other investment products [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues |  | 0.0 |
Administrative service [Member] | Other [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 26.3 | 20.4 |
Distribution and servicing fees [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 30.2 | 36.6 |
Distribution and servicing fees [Member] | U.S. mutual funds [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | 30.2 | 36.6 |
Distribution and servicing fees [Member] | Subadvised and separate accounts and other investment products [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues |  | 0.0 |
Distribution and servicing fees [Member] | Other [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Net revenues | $ 0.0 | $ 0.0 |

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