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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 1,781.8 | $ 1,425.2 |  |  |
Investments | 2,939.8 | 2,453.4 |  |  |
Other assets | 234.4 | 253.7 |  |  |
Total assets | 9,330.4 | 7,689.3 |  |  |
Liabilities | 1,107.3 | 824.7 |  |  |
Attributable to redeemable non-controlling interests | 1,121.0 | 740.3 | $ 992.8 | $ 992.8 | $ 687.2
Consolidated T. Rowe Price investment products |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Net assets | 2,237.7 | 1,641.7 |  |  |
Attributable to T. Rowe Price Group | 1,116.7 | 901.4 |  |  |
Attributable to redeemable non-controlling interests | 1,121.0 | 740.3 |  |  |
Consolidated T. Rowe Price investment products | Reportable entities |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 76.5 | 70.1 |  |  |
Investments | 2,172.4 | 1,584.0 |  |  |
Other assets | 28.0 | 26.3 |  |  |
Total assets | 2,276.9 | 1,680.4 |  |  |
Liabilities | 39.2 | 38.7 |  |  |
Net assets | 2,237.7 | 1,641.7 |  |  |
Consolidated T. Rowe Price investment products | Reportable entities | T.Rowe Price U.S. mutual funds |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Investments | 40.2 | 43.8 |  |  |
Consolidated T. Rowe Price investment products | Reportable entities | T.Rowe Price U.S. mutual funds | Money market mutual funds |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 9.1 | 18.5 |  |  |
VOE |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Net assets | 289.4 | 271.8 |  |  |
Attributable to T. Rowe Price Group | 199.6 | 175.3 |  |  |
Attributable to redeemable non-controlling interests | 89.8 | 96.5 |  |  |
VOE | Reportable entities |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 9.9 | 18.5 |  |  |
Investments | 281.1 | 261.3 |  |  |
Other assets | 10.6 | 8.0 |  |  |
Total assets | 301.6 | 287.8 |  |  |
Liabilities | 12.2 | 16.0 |  |  |
Net assets | 289.4 | 271.8 |  |  |
VIE |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Net assets | 1,948.3 | 1,369.9 |  |  |
Attributable to T. Rowe Price Group | 917.1 | 726.1 |  |  |
Attributable to redeemable non-controlling interests | 1,031.2 | 643.8 |  |  |
VIE | Reportable entities |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 66.6 | 51.6 |  |  |
Investments | 1,891.3 | 1,322.7 |  |  |
Other assets | 17.4 | 18.3 |  |  |
Total assets | 1,975.3 | 1,392.6 |  |  |
Liabilities | 27.0 | 22.7 |  |  |
Net assets | $ 1,948.3 | $ 1,369.9 |  |  |

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