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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 29, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
U.S. Treasury note |  | $ 1.0 |  | $ 1.0 |  | $ 1.0
Total |  | 3,030.8 |  | 3,030.8 |  | 2,939.8
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income |  | 75.5 | $ 4.8 | 53.6 | $ 84.2 |
Gains (losses) recognized upon deconsolidation |  | 191.6 | 43.0 | 106.4 | 370.3 |
Reclassification out of accumulated other comprehensive income | Currency translation adjustments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gains (losses) recognized upon deconsolidation |  | 0.0 | (0.1) | 0.1 | 0.1 |
Assets |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest |  | (132.2) | (113.5) | (278.4) | (169.6) |
Liability |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest |  | (4.0) | (9.8) | (7.6) | (11.0) |
Redeemable noncontrolling interest |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest |  | (44.0) | $ (72.3) | (106.9) | $ (81.4) |
T. Rowe Price investment products - discretionary investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments held at fair value |  | 1,005.6 |  | 1,005.6 |  | 1,221.8
Equity method investments |  | 829.1 |  | 829.1 |  | 610.0
T. Rowe Price investment products - seed capital |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments held at fair value |  | 160.0 |  | 160.0 |  | 181.1
Equity method investments |  | 166.2 |  | 166.2 |  | 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 |  | 565.3 |  | 565.3 |  | 561.1
Equity method investments |  | 40.4 |  | 40.4 |  | 0.0
Investment partnerships and other investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments held at fair value |  | 99.4 |  | 99.4 |  | 99.7
26% interest in UTI Asset Management Company Limited (India) |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments |  | $ 158.5 |  | $ 158.5 |  | $ 164.5
Equity method investment (ownership percentage) |  | 26.00% |  | 26.00% |  | 26.00%
26% interest in UTI Asset Management Company Limited (India) | Subsequent Event |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gain on sale of equity investments | $ 3.5 |  |  |  |  |
Equity method investment (ownership percentage) | 23.00% |  |  |  |  |
Investment partnerships and other investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments |  | $ 5.3 |  | $ 5.3 |  | $ 5.0

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