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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to T. Rowe Price Group	$ 351.9	$ 583.0	$ 448.9	$ 453.7	$ 347.1	$ 390.9	$ 373.9	$ 385.9	$ 1,837.5	$ 1,497.8	$ 1,215.0
Less: net income allocated to outstanding restricted stock and stock unit holders (basic)									43.6	33.9	25.5
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted)									43.6	33.9	25.5
Net income allocated to common stockholders (basic)									1,793.9	1,463.9	1,189.5
Net income allocated to common stockholders (diluted)									$ 1,793.9	$ 1,463.9	$ 1,189.5
Weighted-average common shares
Outstanding (in shares)									242.2	241.2	245.5
Outstanding assuming dilution (in shares)									246.9	245.1	250.3
Weighted-average outstanding stock options excluded (in shares)									0.0	5.0	9.9

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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