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CONSOLIDATED INVESTMENT PRODUCTS - Schedule of Operating Results (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income $ (1,366.9) $ (1,245.0) $ (2,543.4) $ (2,412.6)
Income before income taxes 909.6 713.8 1,541.8 1,380.8
Net income (loss) attributable to redeemable non-controlling interests 63.4 50.9 49.3 65.5
Consolidated T. Rowe Price investment products        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 129.8 76.2 85.7 105.6
Net income (loss) attributable to T. Rowe Price Group 66.4 25.3 36.4 40.1
Net income (loss) attributable to redeemable non-controlling interests 63.4 50.9 49.3 65.5
Consolidated T. Rowe Price investment products | Reportable entities        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (2.8) (2.4) (5.5) (4.9)
Net investment income (loss) reflected in non-operating income (loss) 132.6 78.6 91.2 110.5
Income before income taxes 129.8 76.2 85.7 105.6
Voting interest entities        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 30.2 2.3 27.0 17.2
Net income (loss) attributable to T. Rowe Price Group 23.4 2.2 20.6 12.4
Net income (loss) attributable to redeemable non-controlling interests 6.8 0.1 6.4 4.8
Voting interest entities | Reportable entities        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (0.3) (0.1) (0.5) (0.3)
Net investment income (loss) reflected in non-operating income (loss) 30.5 2.4 27.5 17.5
Income before income taxes 30.2 2.3 27.0 17.2
Variable interest entities        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 99.6 73.9 58.7 88.4
Net income (loss) attributable to T. Rowe Price Group 43.0 23.1 15.8 27.7
Net income (loss) attributable to redeemable non-controlling interests 56.6 50.8 42.9 60.7
Variable interest entities | Reportable entities        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (2.5) (2.3) (5.0) (4.6)
Net investment income (loss) reflected in non-operating income (loss) 102.1 76.2 63.7 93.0
Income before income taxes $ 99.6 $ 73.9 $ 58.7 $ 88.4