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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Income Statements, Captions [Line Items]              
Operating expenses reflected in net operating income $ (754.0) $ (766.6) $ (690.2) $ (678.4) $ (610.9) $ (2,248.5) $ (1,979.5)
Income before income taxes 765.5   615.8     1,994.2 1,872.1
Net income attributable to redeemable non-controlling interests (1.4)   13.3     11.1 43.9
Operating expenses eliminated against investment advisory and administrative fees 1,394.6 $ 1,297.6 1,238.7 $ 1,186.0 $ 1,132.6 4,067.6 3,557.3
Consolidation eliminations [Member]              
Condensed Income Statements, Captions [Line Items]              
Operating expenses reflected in net operating income 1.5   1.4     4.6 3.2
Consolidation eliminations [Member] | Investment advisory and administrative fees              
Condensed Income Statements, Captions [Line Items]              
Operating expenses eliminated against investment advisory and administrative fees 1.5   1.4     4.6 3.2
Consolidated T. Rowe Price investment products [Member]              
Condensed Income Statements, Captions [Line Items]              
Income before income taxes 5.1   34.3     19.4 117.3
Net income attributable to T. Rowe Price Group 6.5   21.0     8.3 73.4
Net income attributable to redeemable non-controlling interests (1.4)   13.3     11.1 43.9
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]              
Condensed Income Statements, Captions [Line Items]              
Operating expenses reflected in net operating income (3.6)   (3.2)     (9.2) (8.5)
Net investment income reflected in non-operating income 8.7   37.5     28.6 125.8
Income before income taxes 5.1   34.3     19.4 117.3
Voting interest entities [Member]              
Condensed Income Statements, Captions [Line Items]              
Income before income taxes 4.4   4.2     3.1 13.8
Net income attributable to T. Rowe Price Group 2.8   3.1     1.5 10.4
Net income attributable to redeemable non-controlling interests 1.6   1.1     1.6 3.4
Voting interest entities [Member] | Reportable entities [Member]              
Condensed Income Statements, Captions [Line Items]              
Operating expenses reflected in net operating income (0.6)   (0.4)     (1.3) (0.9)
Net investment income reflected in non-operating income 5.0   4.6     4.4 14.7
Income before income taxes 4.4   4.2     3.1 13.8
Variable interest entities [Member]              
Condensed Income Statements, Captions [Line Items]              
Income before income taxes 0.7   30.1     16.3 103.5
Net income attributable to T. Rowe Price Group 3.7   17.9     6.8 63.0
Net income attributable to redeemable non-controlling interests (3.0)   12.2     9.5 40.5
Variable interest entities [Member] | Reportable entities [Member]              
Condensed Income Statements, Captions [Line Items]              
Operating expenses reflected in net operating income (3.0)   (2.8)     (7.9) (7.6)
Net investment income reflected in non-operating income 3.7   32.9     24.2 111.1
Income before income taxes $ 0.7   $ 30.1     $ 16.3 $ 103.5