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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Stock options with anti-diluted impact (in shares) 0 0 0 0
Net income attributable to T. Rowe Price Group $ 603.0 $ 527.5 $ 946.1 $ 1,040.1
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) 16.8 13.8 26.2 26.8
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) 16.8 13.8 26.2 26.8
Net income allocated to common stockholders (basic) 586.2 513.7 919.9 1,013.3
Net income allocated to common stockholders (diluted) $ 586.2 $ 513.7 $ 919.9 $ 1,013.3
Weighted-average common shares        
Outstanding (in shares) 227,400,000 235,900,000 230,700,000 236,200,000
Outstanding assuming dilution (in shares) 229,500,000 239,200,000 233,100,000 239,400,000