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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Stock options with anti-diluted impact (in shares) 0 0
Net income attributable to T. Rowe Price Group $ 343.1 $ 512.6
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) 9.4 13.0
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) 9.4 13.0
Net income allocated to common stockholders (basic) 333.7 499.6
Net income allocated to common stockholders (diluted) $ 333.7 $ 499.6
Weighted-average common shares    
Outstanding (in shares) 234,100,000 236,600,000
Outstanding assuming dilution (in shares) 236,800,000 239,600,000