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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Income Statements, Captions [Line Items]                      
Operating expenses reflected in net operating income                 $ (3,461.0) $ (3,230.9) $ (3,011.2)
Income before income taxes                 3,242.2 2,927.3 2,384.6
Net income (loss) attributable to redeemable non-controlling interests                 150.6 117.6 (68.8)
Investment advisory and administrative fees $ (1,732.9) $ (1,595.8) $ (1,415.4) $ (1,462.6) $ (1,468.7) $ (1,426.7) $ (1,395.2) $ (1,327.3) (6,206.7) (5,617.9) (5,372.6)
Consolidation eliminations                      
Condensed Income Statements, Captions [Line Items]                      
Investment advisory and administrative fees                 9.9 6.8 6.2
Consolidated T. Rowe Price investment products | Reportable entities                      
Condensed Income Statements, Captions [Line Items]                      
Operating expenses reflected in net operating income                 (16.4) (14.7) (12.7)
Net gains (losses) reflected in non-operating income                 251.7 272.9 (92.9)
Income before income taxes                 235.3 258.2 (105.6)
Net income (loss) attributable to T. Rowe Price Group                 84.7 140.6 (36.8)
Net income (loss) attributable to redeemable non-controlling interests                 150.6 117.6 (68.8)
VOE | Reportable entities                      
Condensed Income Statements, Captions [Line Items]                      
Operating expenses reflected in net operating income                 (1.6) (2.2) (1.9)
Net gains (losses) reflected in non-operating income                 13.2 31.0 (16.7)
Income before income taxes                 11.6 28.8 (18.6)
Net income (loss) attributable to T. Rowe Price Group                 11.6 21.3 (6.3)
Net income (loss) attributable to redeemable non-controlling interests                 0.0 7.5 (12.3)
VIE | Reportable entities                      
Condensed Income Statements, Captions [Line Items]                      
Operating expenses reflected in net operating income                 (14.8) (12.5) (10.8)
Net gains (losses) reflected in non-operating income                 238.5 241.9 (76.2)
Income before income taxes                 223.7 229.4 (87.0)
Net income (loss) attributable to T. Rowe Price Group                 73.1 119.3 (30.5)
Net income (loss) attributable to redeemable non-controlling interests                 $ 150.6 $ 110.1 $ (56.5)