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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 2,830.1 | $ 2,151.7 |  |
Investments | 3,403.6 | 3,250.8 |  |
Other assets | 218.2 | 219.2 |  |
Total assets | 10,764.4 | 10,659.0 |  |
Liabilities | 1,743.3 | 1,390.3 |  |
Attributable to redeemable non-controlling interests | 1,012.9 | 1,561.7 | $ 971.0 | $ 1,121.0
Consolidated T. Rowe Price investment products |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 1,893.1 | 2,637.8 |  |
Attributable to T. Rowe Price Group | 880.2 | 1,076.1 |  |
Attributable to redeemable non-controlling interests | 1,012.9 | 1,561.7 |  |
Voting interest entities |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 159.2 | 188.1 |  |
Attributable to T. Rowe Price Group | 96.4 | 130.7 |  |
Attributable to redeemable non-controlling interests | 62.8 | 57.4 |  |
Variable interest entities |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 1,733.9 | 2,449.7 |  |
Attributable to T. Rowe Price Group | 783.8 | 945.4 |  |
Attributable to redeemable non-controlling interests | 950.1 | 1,504.3 |  |
Reportable entities | Consolidated T. Rowe Price investment products |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 83.7 | 104.8 |  |
Investments | 1,822.0 | 2,560.9 |  |
Other assets | 41.1 | 29.8 |  |
Total assets | 1,946.8 | 2,695.5 |  |
Liabilities | 53.7 | 57.7 |  |
Net assets | 1,893.1 | 2,637.8 |  |
Reportable entities | Voting interest entities |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 3.0 | 7.1 |  |
Investments | 157.5 | 188.2 |  |
Other assets | 3.4 | 2.8 |  |
Total assets | 163.9 | 198.1 |  |
Liabilities | 4.7 | 10.0 |  |
Net assets | 159.2 | 188.1 |  |
Reportable entities | Variable interest entities |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 80.7 | 97.7 |  |
Investments | 1,664.5 | 2,372.7 |  |
Other assets | 37.7 | 27.0 |  |
Total assets | 1,782.9 | 2,497.4 |  |
Liabilities | 49.0 | 47.7 |  |
Net assets | 1,733.9 | 2,449.7 |  |
Reportable entities | T. Rowe Price investment products | Consolidated T. Rowe Price investment products |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Investments | 24.4 | 26.9 |  |
Money Market Funds | Reportable entities | T. Rowe Price investment products | Consolidated T. Rowe Price investment products |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 2.8 | $ 7.0 |  |

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