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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to T. Rowe Price Group	$ 512.6	$ 453.7
Less: net income allocated to outstanding restricted stock and stock unit holders (basic)	13.0	10.6
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted)	13.0	10.6
Net income allocated to common stockholders (basic)	499.6	443.1
Net income allocated to common stockholders (diluted)	$ 499.6	$ 443.1
Weighted-average common shares
Outstanding (in shares)	236.6	244.3
Outstanding assuming dilution (in shares)	239.6	249.8

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