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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets of consolidated T. Rowe Price investment products $ 2,048.4 $ 1,680.5
Liabilities of consolidated T. Rowe Price investment products $ 55.9 $ 65.6
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) 245,111,000 244,784,000
Common stock, shares issued (in shares) 245,111,000 244,784,000
Variable interest entities [Member]    
Assets of consolidated T. Rowe Price investment products $ 1,839.6 $ 1,446.1
Liabilities of consolidated T. Rowe Price investment products $ 39.5 $ 56.8