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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS - Net Assets (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 3,514.9 |  | $ 2,151.7 |  |  |
Investments | 3,473.9 |  | 3,250.8 |  |  |
Other assets | 220.2 |  | 219.2 |  |  |
Total assets | 11,279.2 |  | 10,659.0 |  |  |
Liabilities | 2,505.8 |  | 1,390.3 |  |  |
Attributable to redeemable non-controlling interests | 880.4 | $ 1,012.9 | 1,561.7 | $ 1,090.1 | $ 971.0 | $ 1,121.0
Consolidated T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 1,636.9 |  | 2,637.8 |  |  |
Attributable to T. Rowe Price | 756.5 |  | 1,076.1 |  |  |
Attributable to redeemable non-controlling interests | 880.4 |  | 1,561.7 |  |  |
Voting interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 62.4 |  | 188.1 |  |  |
Attributable to T. Rowe Price | 45.0 |  | 130.7 |  |  |
Attributable to redeemable non-controlling interests | 17.4 |  | 57.4 |  |  |
Variable interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 1,574.5 |  | 2,449.7 |  |  |
Attributable to T. Rowe Price | 711.5 |  | 945.4 |  |  |
Attributable to redeemable non-controlling interests | 863.0 |  | 1,504.3 |  |  |
Reportable entities | Consolidated T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 56.1 |  | 104.8 |  |  |
Investments | 1,590.9 |  | 2,560.9 |  |  |
Other assets | 20.9 |  | 29.8 |  |  |
Total assets | 1,667.9 |  | 2,695.5 |  |  |
Liabilities | 31.0 |  | 57.7 |  |  |
Net assets | 1,636.9 |  | 2,637.8 |  |  |
Reportable entities | Voting interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 0.9 |  | 7.1 |  |  |
Investments | 61.1 |  | 188.2 |  |  |
Other assets | 0.9 |  | 2.8 |  |  |
Total assets | 62.9 |  | 198.1 |  |  |
Liabilities | 0.5 |  | 10.0 |  |  |
Net assets | 62.4 |  | 188.1 |  |  |
Reportable entities | Variable interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 55.2 |  | 97.7 |  |  |
Investments | 1,529.8 |  | 2,372.7 |  |  |
Other assets | 20.0 |  | 27.0 |  |  |
Total assets | 1,605.0 |  | 2,497.4 |  |  |
Liabilities | 30.5 |  | 47.7 |  |  |
Net assets | 1,574.5 |  | 2,449.7 |  |  |
Reportable entities | T. Rowe Price investment products | Consolidated T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Investments | 31.3 |  | 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 | $ 0.9 |  | $ 7.0 |  |  |

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