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EARNINGS PER SHARE CALCULATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Stock options with anti-diluted impact (in shares)     0 0
Net income attributable to T. Rowe Price Group, Inc. $ 603.0 $ 453.2 $ 1,660.2 $ 1,351.1
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) 15.5 10.6 44.2 32.7
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) 15.5 10.6 44.2 32.7
Net income allocated to common stockholders (basic) 587.5 442.6 1,616.0 1,318.4
Net income allocated to common stockholders (diluted) $ 587.5 $ 442.6 $ 1,616.0 $ 1,318.4
Weighted-average common shares        
Outstanding (in shares) 222,300,000 224,100,000 223,000,000.0 224,300,000
Outstanding assuming dilution (in shares) 222,800,000 224,800,000 223,500,000 225,100,000