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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Investment [Line Items] |  |  |
Cost method investments |  |  | $ 78.0
U.S. Treasury note | $ 1.0 |  | 1.0
Total | 2,095.1 |  | 1,477.3
Available-for-sale investments |  |  | 597.1
Net unrealized losses on T. Rowe Price investments product recognized in nonoperating income | (1.9) |  |
Gains (losses) recognized upon deconsolidation | 16.1 | $ 115.0 |
Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member] |  |  |
Investment [Line Items] |  |  |
Gains (losses) recognized upon deconsolidation | 3.1 | 0.0 |
Assets [Member] |  |  |
Investment [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | 757.5 | 1,035.9 |
Liability [Member] |  |  |
Investment [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (5.2) | (133.2) |
Redeemable noncontrolling interest [Member] |  |  |
Investment [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (632.9) | $ (767.7) |
T. Rowe Price investment products [Member] |  |  |
Investment [Line Items] |  |  |
Investments held at fair value | 1,231.1 |  | 692.1
Equity method investments | 316.7 |  | 277.4
T. Rowe Price investment products designated as economic hedge of supplemental savings plan liability [Member] |  |  |
Investment [Line Items] |  |  |
Investments held at fair value | 283.3 |  | 268.2
Investment partnerships and other investments [Member] |  |  |
Investment [Line Items] |  |  |
Investments held at fair value | 95.2 |  |
Interest in UTI Asset Management Company Limited (India) [Member] |  |  |
Investment [Line Items] |  |  |
Equity method investments | $ 163.2 |  | $ 155.8
Equity method investment (ownership percentage) | 26.00% |  | 26.00%
Investment partnerships and other investments [Member] |  |  |
Investment [Line Items] |  |  |
Equity method investments | $ 4.6 |  | $ 4.8

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