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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
U.S. Treasury note | $ 1.0 |  | $ 1.0
Total | 2,731.3 |  | 2,939.8
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income | (103.6) | $ 50.6 |
Gains recognized upon deconsolidation | (500.3) | 202.8 |
Reclassification out of accumulated other comprehensive income | Currency translation adjustments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Gains recognized upon deconsolidation | 0.1 | 0.1 |
Assets |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (46.2) | 12.3 |
Liability |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (2.4) | (0.9) |
Redeemable noncontrolling interest |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (20.1) | $ 20.4 |
T. Rowe Price investment products |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments held at fair value | 1,088.1 |  | 1,402.9
Equity method investments | 864.5 |  | 705.6
T. Rowe Price investment products designated as an economic hedge of supplemental savings plan liability |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments held at fair value | 500.0 |  | 561.1
Investment partnerships and other investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments held at fair value | 105.5 |  | 99.7
26% interest in UTI Asset Management Company Limited (India) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 166.8 |  | $ 164.5
Equity method investment (ownership percentage) | 26.00% |  | 26.00%
Investment partnerships and other investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 5.4 |  | $ 5.0

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