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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Assets of consolidated T. Rowe Price investment products $ 1,510.8 $ 2,048.4
Liabilities of consolidated T. Rowe Price investment products $ 53.2 $ 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) 243,282,000 245,111,000
Common stock, shares issued (in shares) 243,282,000 245,111,000
Variable interest entities [Member]    
Assets of consolidated T. Rowe Price investment products $ 1,238.5 $ 1,839.6
Liabilities of consolidated T. Rowe Price investment products $ 27.8 $ 39.5