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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

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