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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
U.S. Treasury note |  | $ 1.0 | $ 1.0 |
Total |  | 3,250.8 | 2,939.8 |
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income |  | 142.7 | 105.4 | $ (18.5)
Gains recognized upon deconsolidation |  | 496.5 | 540.3 | 23.2
Currency translation adjustments | Reclassification out of accumulated other comprehensive income |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gains recognized upon deconsolidation |  | 0.7 | 0.1 | 3.6
Assets |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest |  | (546.1) | (380.5) | (736.6)
Liability |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest |  | (10.5) | (15.0) | 17.6
Redeemable non-controlling interest |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest |  | (308.1) | (267.6) | (626.4)
Discretionary investments |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Investments held at fair value |  | 1,647.7 | 1,221.8 |
Equity method investments |  | 242.9 | 610.0 |
Seed capital |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Investments held at fair value |  | 169.5 | 181.1 |
Equity method investments |  | 178.6 | 95.6 |
Dividend distribution |  | 50.8 | 50.6 | $ 36.0
Supplemental savings plan liability economic hedges |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Investments held at fair value |  | 768.1 | 561.1 |
Investment partnerships and other investments |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Investments held at fair value |  | 95.1 | 99.7 |
Investment in UTI Asset Management Company Limited (India) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Equity method investments |  | $ 145.5 | 164.5 |
Equity method investment (ownership percentage) | 23.00% | 26.00% |  |
Gain on sale of equity investments | $ 2.8 |  |  |
Investment partnerships and other investments |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Equity method investments |  | $ 2.4 | $ 5.0 |

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