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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Investment [Line Items] |  |  |  |  |
U.S. Treasury note | $ 1.0 |  | $ 1.0 |  | $ 1.0
Total | 2,605.9 |  | 2,605.9 |  | 2,453.4
Net unrealized gains on T. Rowe Price investments product recognized in nonoperating income | 4.8 | $ 11.3 | 84.2 | $ 17.4 |
Gains (losses) recognized upon deconsolidation | 43.0 | $ 124.9 | 370.3 | $ 175.1 |
Daiwa SB Investments Ltd [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investments ownership percentage |  | 10.00% |  | 10.00% |
Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Gains (losses) recognized upon deconsolidation | (0.1) | $ 0.0 | 0.1 | $ 3.6 |
Assets [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (113.5) | (41.1) | (169.6) | (701.5) |
Liability [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (9.8) | (0.6) | (11.0) | 17.9 |
Redeemable noncontrolling interest [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (72.3) | $ (19.8) | (81.4) | $ (595.0) |
T. Rowe Price investment products [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investments held at fair value | 1,568.0 |  | 1,568.0 |  | 1,538.4
Equity method investments | 320.7 |  | 320.7 |  | 276.2
T. Rowe Price investment products designated as economic hedge of supplemental savings plan liability [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investments held at fair value | 443.0 |  | 443.0 |  | 381.3
Investment partnerships and other investments [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investments held at fair value | 103.2 |  | 103.2 |  | 99.6
Interest in UTI Asset Management Company Limited (India) [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity method investments | $ 165.0 |  | $ 165.0 |  | $ 152.4
Equity method investment (ownership percentage) | 26.00% |  | 26.00% |  | 26.00%
Investment partnerships and other investments [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity method investments | $ 5.0 |  | $ 5.0 |  | $ 4.5

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