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CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Net Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 2,578.7 |  | $ 1,755.6 |  |  |
Investments | 2,503.6 |  | 2,539.2 |  |  |
Other assets | 709.4 |  | 688.7 |  |  |
Total assets | 12,556.8 |  | 11,643.3 |  |  |
Liabilities | 2,375.2 |  | 1,956.4 |  |  |
Attributable to redeemable non-controlling interests | 560.2 | $ 985.2 | 656.7 | $ 580.8 | $ 564.6 | $ 982.3
Consolidated T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Attributable to T. Rowe Price Group | 1,134.3 |  | 857.6 |  |  |
Attributable to redeemable non-controlling interests | 560.2 |  | 656.7 |  |  |
Voting interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Attributable to T. Rowe Price Group | 488.2 |  | 142.4 |  |  |
Attributable to redeemable non-controlling interests | 136.9 |  | 35.4 |  |  |
Variable interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Total assets | 621.7 |  | 526.2 |  |  |
Liabilities | 0.2 |  | 15.8 |  |  |
Attributable to T. Rowe Price Group | 646.1 |  | 715.2 |  |  |
Attributable to redeemable non-controlling interests | 423.3 |  | 621.3 |  |  |
Reportable entities | Consolidated T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 91.6 |  | 119.1 |  |  |
Investments | 1,637.5 |  | 1,460.8 |  |  |
Other assets | 49.2 |  | 23.5 |  |  |
Total assets | 1,778.3 |  | 1,603.4 |  |  |
Liabilities | 83.8 |  | 89.1 |  |  |
Net assets | 1,694.5 |  | 1,514.3 |  |  |
Reportable entities | Consolidated T. Rowe Price investment products | T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Investments | 6.2 |  | 7.6 |  |  |
Reportable entities | Consolidated T. Rowe Price investment products | Money Market Funds | T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 14.5 |  | 2.6 |  |  |
Reportable entities | Voting interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 27.4 |  | 16.2 |  |  |
Investments | 618.7 |  | 205.3 |  |  |
Other assets | 27.0 |  | 6.3 |  |  |
Total assets | 673.1 |  | 227.8 |  |  |
Liabilities | 48.0 |  | 50.0 |  |  |
Net assets | 625.1 |  | 177.8 |  |  |
Reportable entities | Variable interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 64.2 |  | 102.9 |  |  |
Investments | 1,018.8 |  | 1,255.5 |  |  |
Other assets | 22.2 |  | 17.2 |  |  |
Total assets | 1,105.2 |  | 1,375.6 |  |  |
Liabilities | 35.8 |  | 39.1 |  |  |
Net assets | $ 1,069.4 |  | $ 1,336.5 |  |  |

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