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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
U.S. Treasury note | $ 1.0 |  | $ 1.0 |  | $ 1.0
Total | 2,900.0 |  | 2,900.0 |  | 2,939.8
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income | 125.5 | $ 28.7 | 21.9 | $ 79.3 |
Gains recognized upon deconsolidation | 415.1 | 124.5 | (85.2) | 327.3 |
Reclassification out of accumulated other comprehensive income | Currency translation adjustments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gains recognized upon deconsolidation | 0.0 | 0.1 | 0.1 | 0.2 |
Assets |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (100.0) | (68.4) | (146.2) | (56.1) |
Liability |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (1.2) | (0.3) | (3.6) | (1.2) |
Redeemable noncontrolling interest |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (42.8) | $ (29.5) | (62.9) | $ (9.1) |
T. Rowe Price investment products - discretionary investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments held at fair value | 992.4 |  | 992.4 |  | 1,221.8
Equity method investments | 809.6 |  | 809.6 |  | 610.0
T. Rowe Price investment products - seed capital |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments held at fair value | 132.2 |  | 132.2 |  | 181.1
Equity method investments | 145.3 |  | 145.3 |  | 95.6
T. Rowe Price investment products - supplemental savings plan liability economic hedges |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments held at fair value | 529.2 |  | 529.2 |  | 561.1
Equity method investments | 35.3 |  | 35.3 |  | 0.0
Investment partnerships and other investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments held at fair value | 93.4 |  | 93.4 |  | 99.7
26% interest in UTI Asset Management Company Limited (India) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 155.9 |  | $ 155.9 |  | $ 164.5
Equity method investment (ownership percentage) | 26.00% |  | 26.00% |  | 26.00%
Investment partnerships and other investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 5.7 |  | $ 5.7 |  | $ 5.0

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