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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 2,151.7 | $ 1,781.8 |  |
Investments | 3,250.8 | 2,939.8 |  |
Other assets | 219.2 | 234.4 |  |
Total assets | 10,659.0 | 9,330.4 |  |
Liabilities | 1,390.3 | 1,107.3 |  |
Attributable to redeemable non-controlling interests | 1,561.7 | 1,121.0 | $ 740.3 | $ 992.8
Consolidated T. Rowe Price investment products |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 2,637.8 | 2,237.7 |  |
Attributable to T. Rowe Price Group | 1,076.1 | 1,116.7 |  |
Attributable to redeemable non-controlling interests | 1,561.7 | 1,121.0 |  |
VOE |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 188.1 | 289.4 |  |
Attributable to T. Rowe Price Group | 130.7 | 199.6 |  |
Attributable to redeemable non-controlling interests | 57.4 | 89.8 |  |
VIE |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 2,449.7 | 1,948.3 |  |
Attributable to T. Rowe Price Group | 945.4 | 917.1 |  |
Attributable to redeemable non-controlling interests | 1,504.3 | 1,031.2 |  |
Reportable entities | Consolidated T. Rowe Price investment products |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 104.8 | 76.5 |  |
Investments | 2,560.9 | 2,172.4 |  |
Other assets | 29.8 | 28.0 |  |
Total assets | 2,695.5 | 2,276.9 |  |
Liabilities | 57.7 | 39.2 |  |
Net assets | 2,637.8 | 2,237.7 |  |
Reportable entities | Consolidated T. Rowe Price investment products | Sponsored Investment Portfolios |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Investments | 26.9 | 40.2 |  |
Reportable entities | Consolidated T. Rowe Price investment products | Sponsored Investment Portfolios | Money market mutual funds |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 7.0 | 9.1 |  |
Reportable entities | VOE |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 7.1 | 9.9 |  |
Investments | 188.2 | 281.1 |  |
Other assets | 2.8 | 10.6 |  |
Total assets | 198.1 | 301.6 |  |
Liabilities | 10.0 | 12.2 |  |
Net assets | 188.1 | 289.4 |  |
Reportable entities | VIE |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 97.7 | 66.6 |  |
Investments | 2,372.7 | 1,891.3 |  |
Other assets | 27.0 | 17.4 |  |
Total assets | 2,497.4 | 1,975.3 |  |
Liabilities | 47.7 | 27.0 |  |
Net assets | $ 2,449.7 | $ 1,948.3 |  |

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