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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Investment [Line Items] |  |  |  |
U.S. Treasury note | $ 1.0 | $ 1.0 |  |
Total | 2,939.8 | 2,453.4 |  |
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income | 105.4 | (18.5) |  |
Currency translation adjustments | Reclassification out of accumulated other comprehensive income |  |  |  |
Investment [Line Items] |  |  |  |
Gains recognized upon deconsolidation | 0.1 | 3.6 | $ 0.1 |
Assets |  |  |  |
Investment [Line Items] |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (380.5) | (736.6) | (1,397.2) |
Liability |  |  |  |
Investment [Line Items] |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (15.0) | 17.6 | (153.1) |
Redeemable non-controlling interest |  |  |  |
Investment [Line Items] |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (267.6) | (626.4) | (1,042.6) |
T. Rowe Price investment products |  |  |  |
Investment [Line Items] |  |  |  |
Investment held at fair value | 1,402.9 | 1,538.4 |  |
Equity method investments | 705.6 | 276.2 |  |
Dividend distribution | 50.6 | 36.0 | $ 19.2 |
T. Rowe Price investment products designated as an economic hedge of supplemental savings plan liability |  |  |  |
Investment [Line Items] |  |  |  |
Investment held at fair value | 561.1 | 381.3 |  |
Investment partnerships and other investments |  |  |  |
Investment [Line Items] |  |  |  |
Investment held at fair value | 99.7 | 99.6 |  |
26% interest in UTI Asset Management Company Limited (India) |  |  |  |
Investment [Line Items] |  |  |  |
Equity method investments | $ 164.5 | $ 152.4 |  |
Equity method investment (ownership percentage) | 26.00% | 26.00% |  |
Investment partnerships and other investments |  |  |  |
Investment [Line Items] |  |  |  |
Equity method investments | $ 5.0 | $ 4.5 |  |
Daiwa SB Investments Ltd |  |  |  |
Investment [Line Items] |  |  |  |
Ownership interest in investments (as percent) |  |  |  | 10.00%

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