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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investment [Line Items] |  |  |
T. Rowe Price investment products held as available-for-sale | $ 597.1 | $ 709.0 |
Cost method investments | 78.0 | 73.6 |
U.S. Treasury note | 1.0 | 1.0 |
Total | 1,477.3 | 1,257.5 |
Gains (losses) recognized upon deconsolidation | 396.3 | 227.1 | $ 103.5
T. Rowe Price investment products [Member] |  |  |
Investment [Line Items] |  |  |
Equity method investments | 277.4 | 252.3 |
Trading investments | 95.0 | 75.4 |
T. Rowe Price investment products designated as an economic hedge of supplemental savings plan liability [Member] |  |  |
Investment [Line Items] |  |  |
Trading investments | 268.2 | 0.0 |
Interest in UTI Asset Management Company Limited (India) [Member] |  |  |
Investment [Line Items] |  |  |
Equity method investments | $ 155.8 | $ 140.9 |
Equity method investment (ownership percentage) | 26.00% | 26.00% |
Investment partnerships [Member] |  |  |
Investment [Line Items] |  |  |
Equity method investments | $ 4.8 | $ 5.3 |
Currency translation adjustments [Member] | Reclassification out of accumulated other comprehensive income [Member] |  |  |
Investment [Line Items] |  |  |
Gains (losses) recognized upon deconsolidation | 0.1 | 2.2 | (5.8)
Assets [Member] |  |  |
Investment [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | 1,397.2 | 1,342.8 | 20.3
Liability [Member] |  |  |
Investment [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (153.1) | (37.3) | 0.0
Redeemable non-controlling interest [Member] |  |  |
Investment [Line Items] |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | $ (1,042.6) | $ (967.3) | $ 0.0

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