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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, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue and Services [Line Items]              
Net revenues $ 1,394.6 $ 1,297.6 $ 1,238.7 $ 1,186.0 $ 1,132.6 $ 4,067.6 $ 3,557.3
Average assets under management 1,072,400.0   927,400.0     1,045,000.0 886,300.0
Period end assets under management 1,083,800.0 991,100.0       1,083,800.0  
U.S. mutual funds [Member]              
Revenue and Services [Line Items]              
Net revenues 984.2   906.7     2,892.3 2,622.0
Average assets under management 641,500.0   576,100.0     629,400.0 557,800.0
Period end assets under management 644,800.0 606,300.0       644,800.0  
U.S. mutual funds [Member] | Equity and blended asset [Member]              
Revenue and Services [Line Items]              
Average assets under management 511,600.0   452,900.0     500,800.0 438,200.0
Period end assets under management 515,100.0 480,500.0       515,100.0  
U.S. mutual funds [Member] | Fixed income, including money market [Member]              
Revenue and Services [Line Items]              
Average assets under management 129,900.0   123,200.0     128,600.0 119,600.0
Period end assets under management 129,700.0 125,800.0       129,700.0  
Subadvised and separate accounts and other investment products [Member]              
Revenue and Services [Line Items]              
Net revenues 386.0   312.8     1,109.8 877.7
Average assets under management 430,900.0   351,300.0     415,600.0 328,500.0
Period end assets under management 439,000.0 384,800.0       439,000.0  
Subadvised and separate accounts and other investment products [Member] | Equity and blended asset [Member]              
Revenue and Services [Line Items]              
Average assets under management 331,800.0   264,600.0     318,400.0 247,000.0
Period end assets under management 338,800.0 291,900.0       338,800.0  
Subadvised and separate accounts and other investment products [Member] | Fixed income, including money market [Member]              
Revenue and Services [Line Items]              
Average assets under management 99,100.0   86,700.0     97,200.0 81,500.0
Period end assets under management 100,200.0 92,900.0       100,200.0  
Other [Member]              
Revenue and Services [Line Items]              
Net revenues 24.4   19.2     65.5 57.6
Investment advisory fees [Member]              
Revenue and Services [Line Items]              
Net revenues 1,263.3 $ 1,158.2 1,098.9 $ 1,046.0 $ 992.7 3,666.9 3,137.6
Investment advisory fees [Member] | U.S. mutual funds [Member]              
Revenue and Services [Line Items]              
Net revenues 877.3   786.1     2,557.1 2,259.9
Investment advisory fees [Member] | U.S. mutual funds [Member] | Equity and blended asset [Member]              
Revenue and Services [Line Items]              
Net revenues 745.5   657.0     2,169.0 1,880.1
Investment advisory fees [Member] | U.S. mutual funds [Member] | Fixed income, including money market [Member]              
Revenue and Services [Line Items]              
Net revenues 131.8   129.1     388.1 379.8
Investment advisory fees [Member] | Subadvised and separate accounts and other investment products [Member]              
Revenue and Services [Line Items]              
Net revenues 386.0   312.8     1,109.8 877.7
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 326.0   259.6     931.0 727.8
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 60.0   53.2     178.8 149.9
Investment advisory fees [Member] | Other [Member]              
Revenue and Services [Line Items]              
Net revenues 0.0   0.0     0.0 0.0
Administrative service [Member]              
Revenue and Services [Line Items]              
Net revenues 96.7   102.4     294.0 310.7
Administrative service [Member] | U.S. mutual funds [Member]              
Revenue and Services [Line Items]              
Net revenues 72.3   83.2     228.5 253.1
Administrative service [Member] | Subadvised and separate accounts and other investment products [Member]              
Revenue and Services [Line Items]              
Net revenues 0.0   0.0     0.0 0.0
Administrative service [Member] | Other [Member]              
Revenue and Services [Line Items]              
Net revenues 24.4   19.2     65.5 57.6
Distribution and servicing fees [Member]              
Revenue and Services [Line Items]              
Net revenues 34.6   37.4     106.7 109.0
Distribution and servicing fees [Member] | U.S. mutual funds [Member]              
Revenue and Services [Line Items]              
Net revenues 34.6   37.4     106.7 109.0
Distribution and servicing fees [Member] | Subadvised and separate accounts and other investment products [Member]              
Revenue and Services [Line Items]              
Net revenues 0.0   0.0     0.0 0.0
Distribution and servicing fees [Member] | Other [Member]              
Revenue and Services [Line Items]              
Net revenues $ 0.0   $ 0.0     $ 0.0 $ 0.0