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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income attributable to T. Rowe Price Group	$ 347.1	$ 390.9	$ 373.9	$ 385.9	$ 379.8	$ 327.8	$ 203.3	$ 304.1	$ 1,497.8	$ 1,215.0	$ 1,223.0
Less: net income allocated to outstanding restricted stock and stock unit holders (basic)									33.9	25.5	16.1
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted)									33.9	25.5	16.1
Net income allocated to common stockholders (basic)									1,463.9	1,189.5	1,206.9
Net income allocated to common stockholders (diluted)									$ 1,463.9	$ 1,189.5	$ 1,206.9
Weighted-average common shares
Outstanding (in shares)									241.2	245.5	254.6
Outstanding assuming dilution (in shares)									245.1	250.3	260.9
Weighted-average outstanding stock options excluded (in shares)									5.0	9.9	6.4

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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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