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EARNINGS PER SHARE CALCULATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Stock options with anti-diluted impact (in shares) 0 0 0 0
Net income attributable to T. Rowe Price $ 777.2 $ 643.2 $ 2,342.3 $ 1,589.3
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) 19.5 17.9 61.6 44.1
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) 19.5 17.9 61.6 44.1
Net income allocated to common stockholders (basic) 757.7 625.3 2,280.7 1,545.2
Net income allocated to common stockholders (diluted) $ 757.7 $ 625.3 $ 2,280.7 $ 1,545.2
Weighted-average common shares        
Outstanding (in shares) 226,900,000 227,000,000.0 227,200,000 229,500,000
Outstanding assuming dilution (in shares) 229,100,000 229,400,000 229,400,000 231,900,000