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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income $ (767.6) $ (754.0) $ (2,342.5) $ (2,248.5)
Income before income taxes 702.1 765.5 2,177.0 1,994.2
Net income (loss) attributable to redeemable non-controlling interests (0.8) (1.4) 69.0 11.1
Consolidation eliminations [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (2.6) (1.5) (6.3) (4.6)
Consolidated T. Rowe Price investment products [Member]        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 7.9 5.1 165.7 19.4
Net income attributable to T. Rowe Price Group 8.7 6.5 96.7 8.3
Net income (loss) attributable to redeemable non-controlling interests (0.8) (1.4) 69.0 11.1
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (3.7) (3.6) (10.6) (9.2)
Net investment income reflected in non-operating income 11.6 8.7 176.3 28.6
Income before income taxes 7.9 5.1 165.7 19.4
Voting interest entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 0.9 4.4 19.3 3.1
Net income attributable to T. Rowe Price Group 0.7 2.8 14.6 1.5
Net income (loss) attributable to redeemable non-controlling interests 0.2 1.6 4.7 1.6
Voting interest entities [Member] | Reportable entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (0.6) (0.6) (1.6) (1.3)
Net investment income reflected in non-operating income 1.5 5.0 20.9 4.4
Income before income taxes 0.9 4.4 19.3 3.1
Variable interest entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 7.0 0.7 146.4 16.3
Net income attributable to T. Rowe Price Group 8.0 3.7 82.1 6.8
Net income (loss) attributable to redeemable non-controlling interests (1.0) (3.0) 64.3 9.5
Variable interest entities [Member] | Reportable entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (3.1) (3.0) (9.0) (7.9)
Net investment income reflected in non-operating income 10.1 3.7 155.4 24.2
Income before income taxes $ 7.0 $ 0.7 $ 146.4 $ 16.3