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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to T. Rowe Price Group	$ 783.4	$ 643.2	$ 603.0	$ 343.1	$ 545.3	$ 545.9	$ 527.5	$ 512.6	$ 2,372.7	$ 2,131.3	$ 1,837.5
Less: net income allocated to outstanding restricted stock and stock unit holders (basic)									65.3	55.3	43.6
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted)									65.3	55.3	43.6
Net income allocated to common stockholders (basic)									2,307.4	2,076.0	1,793.9
Net income allocated to common stockholders (diluted)									$ 2,307.4	$ 2,076.0	$ 1,793.9
Weighted-average common shares
Outstanding (in shares)									228.8	235.4	242.2
Outstanding assuming dilution (in shares)									231.2	238.6	246.9

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