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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017
Revenue and Services [Line Items] |  |  |  |  |
Investment advisory fees | $ 1,189.2 | $ 1,158.2 | $ 1,098.9 | $ 1,046.0 | $ 992.7
Administrative fees | 102.2 |  |  |  | 104.7
Distribution and servicing fees | 36.6 |  |  |  | 35.2
Net revenues | 1,328.0 | 1,297.6 | $ 1,238.7 | $ 1,186.0 | 1,132.6
Average assets under management | 1,025,500.0 |  |  |  | 845,400.0
Period end assets under management | 1,014,200.0 | 991,100.0 |  |  |
U.S. mutual funds [Member] |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Investment advisory fees | 832.9 |  |  |  | 717.4
Administrative fees | 81.8 |  |  |  | 86.3
Distribution and servicing fees | 36.6 |  |  |  | 35.2
Net revenues | 951.3 |  |  |  | 838.9
Average assets under management | 622,000.0 |  |  |  | 536,500.0
Period end assets under management | 612,900.0 | 606,300.0 |  |  |
U.S. mutual funds [Member] | Equity and blended asset [Member] |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Investment advisory fees | 705.5 |  |  |  | 594.2
Average assets under management | 494,600.0 |  |  |  | 421,000.0
Period end assets under management | 484,100.0 | 480,500.0 |  |  |
U.S. mutual funds [Member] | Fixed income and money market [Member] |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Investment advisory fees | 127.4 |  |  |  | 123.2
Average assets under management | 127,400.0 |  |  |  | 115,500.0
Period end assets under management | 128,800.0 | 125,800.0 |  |  |
Subadvised and separately managed accounts and other investment products [Member] |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Investment advisory fees | 356.3 |  |  |  | 275.3
Administrative fees | 0.0 |  |  |  | 0.0
Distribution and servicing fees | 0.0 |  |  |  | 0.0
Net revenues | 356.3 |  |  |  | 275.3
Average assets under management | 403,500.0 |  |  |  | 308,900.0
Period end assets under management | 401,300.0 | 384,800.0 |  |  |
Subadvised and separately managed accounts and other investment products [Member] | Equity and blended asset [Member] |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Investment advisory fees | 297.0 |  |  |  | 227.9
Average assets under management | 308,200.0 |  |  |  | 231,600.0
Period end assets under management | 304,800.0 | 291,900.0 |  |  |
Subadvised and separately managed accounts and other investment products [Member] | Fixed income and money market [Member] |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Investment advisory fees | 59.3 |  |  |  | 47.4
Average assets under management | 95,300.0 |  |  |  | 77,300.0
Period end assets under management | 96,500.0 | $ 92,900.0 |  |  |
Other [Member] |  |  |  |  |
Revenue and Services [Line Items] |  |  |  |  |
Investment advisory fees | 0.0 |  |  |  | 0.0
Administrative fees | 20.4 |  |  |  | 18.4
Distribution and servicing fees | 0.0 |  |  |  | 0.0
Net revenues | $ 20.4 |  |  |  | $ 18.4

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