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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Assets of consolidated sponsored investment portfolios $ 2,082.1 $ 1,680.5
Liabilities of consolidated sponsored investment portfolios $ 53.8 $ 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) 242,214,000 244,784,000
Common stock, shares issued (in shares) 242,214,000 244,784,000
Variable interest entities [Member]    
Assets of consolidated sponsored investment portfolios $ 1,845.5 $ 1,446.1
Liabilities of consolidated sponsored investment portfolios $ 43.3 $ 56.8