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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Income Statements, Captions [Line Items]                      
Operating expenses                 $ (2,684.2) $ (2,489.5) $ (2,301.7)
Income before income taxes                 2,505.1 1,960.5 2,002.4
Net income attributable to redeemable non-controlling interests                 83.4 39.0 0.0
Investment advisory and administrative fees $ (1,286.1) $ (1,221.7) $ (1,171.6) $ (1,113.6) $ (1,091.2) $ (1,092.9) $ (1,044.7) $ (994.1) (4,793.0) (4,222.9) $ (4,200.6)
Consolidation eliminations [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Operating expenses                 5.6 6.5  
Investment advisory and administrative fees                 5.6 6.5  
Consolidated T. Rowe Price investment products [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Income before income taxes                 181.6 108.1  
Net income attributable to T. Rowe Price Group                 98.2 69.1  
Net income attributable to redeemable non-controlling interests                 83.4 39.0  
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Operating expenses                 (12.3) (13.0)  
Net investment non-operating income                 193.9 121.1  
Income before income taxes                 181.6 108.1  
Voting interest entities [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Income before income taxes                 17.7 20.9  
Net income attributable to T. Rowe Price Group                 13.3 15.0  
Net income attributable to redeemable non-controlling interests                 4.4 5.9  
Voting interest entities [Member] | Reportable entities [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Operating expenses                 (1.1) (1.6)  
Net investment non-operating income                 18.8 22.5  
Income before income taxes                 17.7 20.9  
Variable interest entities [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Income before income taxes                 163.9 87.2  
Net income attributable to T. Rowe Price Group                 84.9 54.1  
Net income attributable to redeemable non-controlling interests                 79.0 33.1  
Variable interest entities [Member] | Reportable entities [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Operating expenses                 (11.2) (11.4)  
Net investment non-operating income                 175.1 98.6  
Income before income taxes                 $ 163.9 $ 87.2