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CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Net Assets (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 3,173.5 |  | $ 2,066.6 |  |  |
Investments | 2,966.0 |  | 2,554.7 |  |  |
Other assets | 622.6 |  | 692.5 |  |  |
Total assets | 13,705.9 |  | 12,278.8 |  |  |
Liabilities | 2,489.8 |  | 1,987.6 |  |  |
Attributable to redeemable non-controlling interests | 763.4 | $ 689.0 | 594.1 | $ 560.2 | $ 985.2 | $ 656.7
Consolidated T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Attributable to T. Rowe Price Group, Inc. | 1,036.0 |  | 1,311.0 |  |  |
Attributable to redeemable non-controlling interests |  |  | 594.1 |  |  |
Voting interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Attributable to T. Rowe Price Group, Inc. | 319.3 |  | 589.9 |  |  |
Attributable to redeemable non-controlling interests | 98.7 |  | 146.0 |  |  |
Variable interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Total assets | 566.5 |  | 564.7 |  |  |
Liabilities | 0.2 |  | 1.9 |  |  |
Attributable to T. Rowe Price Group, Inc. | 716.7 |  | 721.1 |  |  |
Attributable to redeemable non-controlling interests | 664.7 |  | 448.1 |  |  |
Reportable entities | Consolidated T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 55.1 |  | 77.2 |  |  |
Investments | 1,766.9 |  | 1,847.0 |  |  |
Other assets | 35.2 |  | 35.1 |  |  |
Total assets | 1,857.2 |  | 1,959.3 |  |  |
Liabilities | 57.8 |  | 54.2 |  |  |
Net assets | 1,799.4 |  | 1,905.1 |  |  |
Reportable entities | Consolidated T. Rowe Price investment products | T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Investments | 6.5 |  | 6.2 |  |  |
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 | 5.2 |  | 16.2 |  |  |
Reportable entities | Voting interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 5.8 |  | 25.7 |  |  |
Investments | 418.6 |  | 718.0 |  |  |
Other assets | 13.4 |  | 11.2 |  |  |
Total assets | 437.8 |  | 754.9 |  |  |
Liabilities | 19.8 |  | 19.0 |  |  |
Net assets | 418.0 |  | 735.9 |  |  |
Reportable entities | Variable interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 49.3 |  | 51.5 |  |  |
Investments | 1,348.3 |  | 1,129.0 |  |  |
Other assets | 21.8 |  | 23.9 |  |  |
Total assets | 1,419.4 |  | 1,204.4 |  |  |
Liabilities | 38.0 |  | 35.2 |  |  |
Net assets | $ 1,381.4 |  | $ 1,169.2 |  |  |

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