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BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (Impact on Condensed Consolidated Statements of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues $ 1,305.0 $ 1,394.6 $ 1,345.0 $ 1,328.0 $ 1,297.6 $ 1,238.7 $ 1,186.0 $ 1,132.6 $ 5,372.6 $ 4,854.9 $ 4,284.8
Compensation and related costs                 1,808.6 1,664.9 1,494.0
Distribution and servicing costs                 281.2 262.6 233.4
Advertising and promotion                 99.6 92.4 80.2
Product-related costs                 157.1 146.0 139.7
Technology, occupancy, and facility costs                 383.9 350.5 319.8
General, administrative, and other                 296.0 279.7 218.1
Nonrecurring net charge (recoveries) related to Dell appraisal rights matter                 (15.2) (50.0) 66.2
Total operating expenses                 3,011.2 2,746.1 2,551.4
Net operating income                 2,361.4 2,108.8 1,733.4
Investment advisory fees [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                 4,850.6 4,295.8 3,735.0
Administrative, distribution, and servicing fees [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                 $ 522.0 559.1 549.8
As previously reported [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   4,793.0 4,222.9
Compensation and related costs                   1,664.9 1,494.0
Distribution and servicing costs                   147.0 141.7
Advertising and promotion                   92.0 79.9
Product-related costs                   0.0 0.0
Technology, occupancy, and facility costs                   338.5 306.2
General, administrative, and other                   491.8 401.5
Nonrecurring net charge (recoveries) related to Dell appraisal rights matter                   (50.0) 66.2
Total operating expenses                   2,684.2 2,489.5
Net operating income                   2,108.8 1,733.4
As previously reported [Member] | Investment advisory fees [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   4,287.7 3,728.7
As previously reported [Member] | Administrative, distribution, and servicing fees [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   505.3 494.2
Change in Presentation [Member] | Restatement adjustment [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   0.0 0.0
Compensation and related costs                   0.0 0.0
Distribution and servicing costs                   107.4 85.4
Advertising and promotion                   0.0 0.0
Product-related costs                   93.2 84.8
Technology, occupancy, and facility costs                   12.0 13.7
General, administrative, and other                   (212.6) (183.9)
Nonrecurring net charge (recoveries) related to Dell appraisal rights matter                   0.0 0.0
Total operating expenses                   0.0 0.0
Net operating income                   0.0 0.0
Change in Presentation [Member] | Restatement adjustment [Member] | Investment advisory fees [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   0.0 0.0
Change in Presentation [Member] | Restatement adjustment [Member] | Administrative, distribution, and servicing fees [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   0.0 0.0
ASU 2014-09 [Member] | Restatement adjustment [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   61.9 61.9
Compensation and related costs                   0.0 0.0
Distribution and servicing costs                   8.2 6.3
Advertising and promotion                   0.4 0.3
Product-related costs                   52.8 54.9
Technology, occupancy, and facility costs                   0.0 (0.1)
General, administrative, and other                   0.5 0.5
Nonrecurring net charge (recoveries) related to Dell appraisal rights matter                   0.0 0.0
Total operating expenses                   61.9 61.9
Net operating income                   0.0 0.0
ASU 2014-09 [Member] | Restatement adjustment [Member] | Investment advisory fees [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   8.1 6.3
ASU 2014-09 [Member] | Restatement adjustment [Member] | Administrative, distribution, and servicing fees [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   $ 53.8 $ 55.6