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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 1,425.2 | $ 1,902.7 |  |
Investments | 2,453.4 | 1,477.3 |  |
Other assets | 253.7 | 224.0 |  |
Total assets | 7,689.3 | 7,535.4 |  |
Liabilities | 824.7 | 718.2 |  |
Attributable to redeemable non-controlling interests | 740.3 | 992.8 | $ 687.2 | $ 672.7
Consolidated T. Rowe Price investment products [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 70.1 | 103.1 | $ 65.6 |
Net assets | 1,641.7 | 1,992.5 |  |
Attributable to redeemable non-controlling interests | 740.3 | 992.8 |  |
Attributable to T. Rowe Price Group | 901.4 | 999.7 |  |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 70.1 | 103.1 |  |
Investments | 1,584.0 | 1,914.5 |  |
Other assets | 26.3 | 30.8 |  |
Total assets | 1,680.4 | 2,048.4 |  |
Liabilities | 38.7 | 55.9 |  |
Net assets | 1,641.7 | 1,992.5 |  |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T.Rowe Price U.S. mutual funds [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Investments | 43.8 | 15.0 |  |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T.Rowe Price U.S. mutual funds [Member] | Money market mutual funds [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 18.5 | 6.2 |  |
Voting interest entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 271.8 | 192.4 |  |
Attributable to redeemable non-controlling interests | 96.5 | 60.8 |  |
Attributable to T. Rowe Price Group | 175.3 | 131.6 |  |
Voting interest entities [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 18.5 | 7.1 |  |
Investments | 261.3 | 188.8 |  |
Other assets | 8.0 | 12.9 |  |
Total assets | 287.8 | 208.8 |  |
Liabilities | 16.0 | 16.4 |  |
Net assets | 271.8 | 192.4 |  |
Variable interest entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 1,369.9 | 1,800.1 |  |
Attributable to redeemable non-controlling interests | 643.8 | 932.0 |  |
Attributable to T. Rowe Price Group | 726.1 | 868.1 |  |
Variable interest entities [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 51.6 | 96.0 |  |
Investments | 1,322.7 | 1,725.7 |  |
Other assets | 18.3 | 17.9 |  |
Total assets | 1,392.6 | 1,839.6 |  |
Liabilities | 22.7 | 39.5 |  |
Net assets | $ 1,369.9 | $ 1,800.1 |  |

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