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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