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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 2,228.2 |  | $ 1,781.8 |  |  |
Investments | 3,030.8 |  | 2,939.8 |  |  |
Other assets | 231.7 |  | 234.4 |  |  |
Total assets | 10,134.6 |  | 9,330.4 |  |  |
Liabilities | 1,665.9 |  | 1,107.3 |  |  |
Attributable to redeemable non-controlling interests | 1,340.2 | $ 1,090.1 | 1,121.0 | $ 1,102.9 | $ 1,012.3 | $ 740.3
Consolidated T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 2,395.8 |  | 2,237.7 |  |  |
Attributable to T. Rowe Price Group | 1,055.6 |  | 1,116.7 |  |  |
Attributable to redeemable non-controlling interests | 1,340.2 |  | 1,121.0 |  |  |
Consolidated T. Rowe Price investment products | Reportable entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 78.0 |  | 76.5 |  |  |
Investments | 2,329.1 |  | 2,172.4 |  |  |
Other assets | 35.2 |  | 28.0 |  |  |
Total assets | 2,442.3 |  | 2,276.9 |  |  |
Liabilities | 46.5 |  | 39.2 |  |  |
Net assets | 2,395.8 |  | 2,237.7 |  |  |
Consolidated T. Rowe Price investment products | Reportable entities | T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Investments | 18.9 |  | 40.2 |  |  |
Consolidated T. Rowe Price investment products | Money Market Funds | Reportable entities | T. Rowe Price investment products |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 5.1 |  | 9.1 |  |  |
Voting interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 177.3 |  | 289.4 |  |  |
Attributable to T. Rowe Price Group | 126.2 |  | 199.6 |  |  |
Attributable to redeemable non-controlling interests | 51.1 |  | 89.8 |  |  |
Voting interest entities | Reportable entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 5.2 |  | 9.9 |  |  |
Investments | 178.8 |  | 281.1 |  |  |
Other assets | 3.0 |  | 10.6 |  |  |
Total assets | 187.0 |  | 301.6 |  |  |
Liabilities | 9.7 |  | 12.2 |  |  |
Net assets | 177.3 |  | 289.4 |  |  |
Variable interest entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Net assets | 2,218.5 |  | 1,948.3 |  |  |
Attributable to T. Rowe Price Group | 929.4 |  | 917.1 |  |  |
Attributable to redeemable non-controlling interests | 1,289.1 |  | 1,031.2 |  |  |
Variable interest entities | Reportable entities |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 72.8 |  | 66.6 |  |  |
Investments | 2,150.3 |  | 1,891.3 |  |  |
Other assets | 32.2 |  | 17.4 |  |  |
Total assets | 2,255.3 |  | 1,975.3 |  |  |
Liabilities | 36.8 |  | 27.0 |  |  |
Net assets | $ 2,218.5 |  | $ 1,948.3 |  |  |

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