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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets of consolidated T. Rowe Price investment products	$ 1,917.8	$ 2,048.4
Liabilities of consolidated T. Rowe Price investment products	$ 74.7	$ 55.9
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.2	$ 0.2
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 0.2	$ 0.2
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares outstanding (in shares)	242,599,000	245,111,000
Common stock, shares issued (in shares)	242,599,000	245,111,000
Variable interest entities [Member]
Assets of consolidated T. Rowe Price investment products	$ 1,613.8	$ 1,839.6
Liabilities of consolidated T. Rowe Price investment products	$ 61.0	$ 39.5

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