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EARNINGS PER SHARE CALCULATIONS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Stock options with anti-diluted impact (in shares)	0	0
Net income attributable to T. Rowe Price	$ 567.9	$ 749.4
Less: net income allocated to outstanding restricted stock and stock unit holders (basic)	13.0	19.9
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted)	13.0	19.9
Net income allocated to common stockholders (basic)	554.9	729.5
Net income allocated to common stockholders (diluted)	$ 554.9	$ 729.5
Weighted-average common shares
Outstanding (in shares)	228,200,000	227,700,000
Outstanding assuming dilution (in shares)	229,800,000	230,000,000.0

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