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SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Unaudited). (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unusual or Infrequent Item, or Both [Line Items]                      
Net revenues $ 1,468.7 $ 1,426.7 $ 1,395.2 $ 1,327.3 $ 1,305.0 $ 1,394.6 $ 1,345.0 $ 1,328.0 $ 5,617.9 $ 5,372.6 $ 4,854.9
Net income 593.9 545.1 555.9 554.0 272.0 581.6 459.6 455.5 2,248.9 1,768.7 1,581.2
Net income attributable to T. Rowe Price Group $ 545.3 $ 545.9 $ 527.5 $ 512.6 $ 351.9 $ 583.0 $ 448.9 $ 453.7 $ 2,131.3 $ 1,837.5 $ 1,497.8
Basic earnings on common stock (in dollars per share) $ 2.27 $ 2.26 $ 2.18 $ 2.11 $ 1.43 $ 2.34 $ 1.81 $ 1.81 $ 8.82 $ 7.41 $ 6.07
Diluted earnings per share (in dollars per share) $ 2.24 $ 2.23 $ 2.15 $ 2.09 1.41 2.30 $ 1.77 $ 1.77 $ 8.70 $ 7.27 $ 5.97
Nonrecurring recoveries related to Dell appraisal rights matter                 $ 0.0 $ (15.2) $ (50.0)
Income tax provision related to the tax law changes             $ 20.8     20.8  
Diluted earnings per share related to tax reform (in dollars per share)             $ 0.08        
Daiwa SB Investments Ltd                      
Unusual or Infrequent Item, or Both [Line Items]                      
Diluted earnings per share (in dollars per share)           $ 0.27          
Ownership interest in investments (as percent)           10.00%          
State and local jurisdiction | Comptroller of Maryland                      
Unusual or Infrequent Item, or Both [Line Items]                      
Diluted earnings per share (in dollars per share)             $ 0.03        
Nonrecurring income tax charge due to Maryland state tax legislation             $ 7.9     $ 7.9  
Dell appraisal rights matter                      
Unusual or Infrequent Item, or Both [Line Items]                      
Diluted earnings per share (in dollars per share)         $ 0.05            
Nonrecurring recoveries related to Dell appraisal rights matter         $ (15.2)