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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 1,657.4 | $ 1,425.2 |  |
Investments | 2,546.7 | 2,453.4 |  |
Other assets | 253.8 | 253.7 |  |
Total assets | 8,458.9 | 7,689.3 |  |
Liabilities | 1,261.2 | 824.7 |  |
Attributable to redeemable non-controlling interests | 886.7 | 740.3 | $ 546.5 | $ 992.8
Consolidated T. Rowe Price investment products [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 1,871.6 | 1,641.7 |  |
Attributable to T. Rowe Price Group | 984.9 | 901.4 |  |
Attributable to redeemable non-controlling interests | 886.7 | 740.3 |  |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 76.1 | 70.1 |  |
Investments | 1,798.7 | 1,584.0 |  |
Other assets | 61.5 | 26.3 |  |
Total assets | 1,936.3 | 1,680.4 |  |
Liabilities | 64.7 | 38.7 |  |
Net assets | 1,871.6 | 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 | 42.1 | 43.8 |  |
Voting interest entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 292.1 | 271.8 |  |
Attributable to T. Rowe Price Group | 199.8 | 175.3 |  |
Attributable to redeemable non-controlling interests | 92.3 | 96.5 |  |
Voting interest entities [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 16.3 | 18.5 |  |
Investments | 289.7 | 261.3 |  |
Other assets | 9.7 | 8.0 |  |
Total assets | 315.7 | 287.8 |  |
Liabilities | 23.6 | 16.0 |  |
Net assets | 292.1 | 271.8 |  |
Variable interest entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 1,579.5 | 1,369.9 |  |
Attributable to T. Rowe Price Group | 785.1 | 726.1 |  |
Attributable to redeemable non-controlling interests | 794.4 | 643.8 |  |
Variable interest entities [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 59.8 | 51.6 |  |
Investments | 1,509.0 | 1,322.7 |  |
Other assets | 51.8 | 18.3 |  |
Total assets | 1,620.6 | 1,392.6 |  |
Liabilities | 41.1 | 22.7 |  |
Net assets | 1,579.5 | 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 | $ 15.3 | $ 18.5 |  |

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