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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income $ (780.1) $ (750.3) $ (1,574.9) $ (1,494.5)
Income before income taxes 739.6 628.8 1,474.9 1,228.7
Net income (loss) attributable to redeemable non-controlling interests 28.4 10.7 69.8 12.5
Operating expenses eliminated against investment advisory and administrative fees 1,395.2 1,345.0 2,722.5 2,673.0
Consolidation eliminations [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (2.2) (1.4) (3.7) (3.1)
Consolidated T. Rowe Price investment products [Member]        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 59.0 16.0 157.8 14.3
Net income (loss) attributable to T. Rowe Price Group 30.6 5.3 88.0 1.8
Net income (loss) attributable to redeemable non-controlling interests 28.4 10.7 69.8 12.5
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (3.8) (3.1) (6.9) (5.6)
Net investment income (loss) reflected in non-operating income 62.8 19.1 164.7 19.9
Income before income taxes 59.0 16.0 157.8 14.3
Voting interest entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 10.7 (0.2) 18.4 (1.3)
Net income (loss) attributable to T. Rowe Price Group 5.2 (0.6) 13.9 (1.3)
Net income (loss) attributable to redeemable non-controlling interests 5.5 0.4 4.5 0.0
Voting interest entities [Member] | Reportable entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (0.7) (0.4) (1.0) (0.7)
Net investment income (loss) reflected in non-operating income 11.4 0.2 19.4 (0.6)
Income before income taxes 10.7 (0.2) 18.4 (1.3)
Variable interest entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Income before income taxes 48.3 16.2 139.4 15.6
Net income (loss) attributable to T. Rowe Price Group 25.4 5.9 74.1 3.1
Net income (loss) attributable to redeemable non-controlling interests 22.9 10.3 65.3 12.5
Variable interest entities [Member] | Reportable entities [Member]        
Condensed Income Statements, Captions [Line Items]        
Operating expenses reflected in net operating income (3.1) (2.7) (5.9) (4.9)
Net investment income (loss) reflected in non-operating income 51.4 18.9 145.3 20.5
Income before income taxes $ 48.3 $ 16.2 $ 139.4 $ 15.6