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EARNINGS PER SHARE CALCULATIONS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net income attributable to T. Rowe Price Group $ 3,082.9 $ 2,372.7 $ 2,131.3
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) 80.5 65.3 55.3
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) 80.5 65.3 55.3
Net income allocated to common stockholders (basic) 3,002.4 2,307.4 2,076.0
Net income allocated to common stockholders (diluted) $ 3,002.4 $ 2,307.4 $ 2,076.0
Weighted-average common shares      
Outstanding (in shares) 226,600,000 228,800,000 235,400,000
Outstanding assuming dilution (in shares) 228,800,000 231,200,000 238,600,000
Stock options with anti-diluted impact (in shares) 0 0 0