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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 1,802.4 |  | $ 1,425.2 |  |  |
Investments | 2,575.2 |  | 2,453.4 |  |  |
Other assets | 253.7 |  | 253.7 |  |  |
Total assets | 8,912.3 |  | 7,689.3 |  |  |
Liabilities | 1,320.9 |  | 824.7 |  |  |
Attributable to redeemable non-controlling interests | 1,012.3 | $ 886.7 | 740.3 | $ 739.2 | $ 546.5 | $ 992.8
Consolidated T. Rowe Price investment products [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 2,100.9 |  | 1,641.7 |  |  |
Attributable to T. Rowe Price Group | 1,088.6 |  | 901.4 |  |  |
Attributable to redeemable non-controlling interests | 1,012.3 |  | 740.3 |  |  |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 110.7 |  | 70.1 |  |  |
Investments | 2,023.0 |  | 1,584.0 |  |  |
Other assets | 69.7 |  | 26.3 |  |  |
Total assets | 2,203.4 |  | 1,680.4 |  |  |
Liabilities | 102.5 |  | 38.7 |  |  |
Net assets | 2,100.9 |  | 1,641.7 |  |  |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T. Rowe Price investment products [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Investments | 41.1 |  | 43.8 |  |  |
Voting interest entities [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 301.6 |  | 271.8 |  |  |
Attributable to T. Rowe Price Group | 203.8 |  | 175.3 |  |  |
Attributable to redeemable non-controlling interests | 97.8 |  | 96.5 |  |  |
Voting interest entities [Member] | Reportable entities [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 15.2 |  | 18.5 |  |  |
Investments | 301.9 |  | 261.3 |  |  |
Other assets | 11.2 |  | 8.0 |  |  |
Total assets | 328.3 |  | 287.8 |  |  |
Liabilities | 26.7 |  | 16.0 |  |  |
Net assets | 301.6 |  | 271.8 |  |  |
Variable interest entities [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 1,799.3 |  | 1,369.9 |  |  |
Attributable to T. Rowe Price Group | 884.8 |  | 726.1 |  |  |
Attributable to redeemable non-controlling interests | 914.5 |  | 643.8 |  |  |
Variable interest entities [Member] | Reportable entities [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 95.5 |  | 51.6 |  |  |
Investments | 1,721.1 |  | 1,322.7 |  |  |
Other assets | 58.5 |  | 18.3 |  |  |
Total assets | 1,875.1 |  | 1,392.6 |  |  |
Liabilities | 75.8 |  | 22.7 |  |  |
Net assets | 1,799.3 |  | 1,369.9 |  |  |
Money Market Funds [Member] | Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T. Rowe Price investment products [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 14.2 |  | $ 18.5 |  |  |

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