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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Stock options with anti-diluted impact (in shares) 0 0
Net income attributable to T. Rowe Price Group $ 749.4 $ 343.1
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) 19.9 9.4
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) 19.9 9.4
Net income allocated to common stockholders (basic) 729.5 333.7
Net income allocated to common stockholders (diluted) $ 729.5 $ 333.7
Weighted-average common shares    
Outstanding (in shares) 227,700,000 234,100,000
Outstanding assuming dilution (in shares) 230,000,000.0 236,800,000