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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Investment [Line Items] |  |  |  |  |
U.S. Treasury note | $ 1.0 |  | $ 1.0 |  | $ 1.0
Total | 2,575.2 |  | 2,575.2 |  | 2,453.4
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income | 28.7 | $ 8.0 | 79.3 | $ 6.1 |
Gains (losses) recognized upon deconsolidation | 124.5 | 34.1 | 327.3 | 50.2 |
Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Gains (losses) recognized upon deconsolidation | 0.1 | 0.5 | 0.2 | 3.6 |
Assets [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (68.4) | 97.1 | (56.1) | (660.4) |
Liability [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (0.3) | 23.7 | (1.2) | 18.5 |
Redeemable noncontrolling interest [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (29.5) | $ 57.7 | (9.1) | $ (575.2) |
T. Rowe Price investment products [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investments held at fair value | 1,546.2 |  | 1,546.2 |  | 1,538.4
Equity method investments | 317.3 |  | 317.3 |  | 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 | 441.3 |  | 441.3 |  | 381.3
Investment partnerships and other investments [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investments held at fair value | 100.4 |  | 100.4 |  | 99.6
Interest in UTI Asset Management Company Limited (India) [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity method investments | $ 164.1 |  | $ 164.1 |  | $ 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 | $ 4.9 |  | $ 4.9 |  | $ 4.5

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