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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Condensed Income Statements, Captions [Line Items]          
Operating expenses $ (744.2) $ (766.6) $ (690.2) $ (678.4) $ (610.9)
Income before income taxes 599.9       636.7
Net income attributable to redeemable non-controlling interests 1.8       14.5
Investment advisory and administrative fees (1,328.0) $ (1,297.6) $ (1,238.7) $ (1,186.0) (1,132.6)
Consolidation eliminations [Member]          
Condensed Income Statements, Captions [Line Items]          
Operating expenses 1.7       0.8
Investment advisory and administrative fees 1.7       0.8
Consolidated T. Rowe Price investment products [Member]          
Condensed Income Statements, Captions [Line Items]          
Income before income taxes (1.7)       46.3
Net income attributable to T. Rowe Price Group (3.5)       31.8
Net income attributable to redeemable non-controlling interests 1.8       14.5
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]          
Condensed Income Statements, Captions [Line Items]          
Operating expenses (2.5)       (2.6)
Non-operating investment income 0.8       48.9
Income before income taxes (1.7)       46.3
Voting interest entities [Member]          
Condensed Income Statements, Captions [Line Items]          
Income before income taxes (1.1)       5.0
Net income attributable to T. Rowe Price Group (0.7)       3.9
Net income attributable to redeemable non-controlling interests (0.4)       1.1
Voting interest entities [Member] | Reportable entities [Member]          
Condensed Income Statements, Captions [Line Items]          
Operating expenses (0.3)       (0.3)
Non-operating investment income (0.8)       5.3
Income before income taxes (1.1)       5.0
Variable interest entities [Member]          
Condensed Income Statements, Captions [Line Items]          
Income before income taxes (0.6)       41.3
Net income attributable to T. Rowe Price Group (2.8)       27.9
Net income attributable to redeemable non-controlling interests 2.2       13.4
Variable interest entities [Member] | Reportable entities [Member]          
Condensed Income Statements, Captions [Line Items]          
Operating expenses (2.2)       (2.3)
Non-operating investment income 1.6       43.6
Income before income taxes $ (0.6)       $ 41.3