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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to T. Rowe Price Group	$ 453.7	$ 385.9
Less: net income allocated to outstanding restricted stock and stock unit holders	10.6	8.7
Less: net income allocated to outstanding restricted stock and stock unit holders	10.6	8.7
Net income allocated to common stockholders (basic)	443.1	377.2
Net income allocated to common stockholders (diluted)	$ 443.1	$ 377.2
Weighted-average common shares
Outstanding (in shares)	244.3	242.1
Outstanding assuming dilution (in shares)	249.8	245.5
Weighted-average outstanding stock options excluded (in shares)	0.0	9.5

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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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