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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Assets of consolidated sponsored investment portfolios $ 6,581.7 $ 5,106.9
Liabilities of consolidated sponsored investment portfolios $ 610.4 $ 344.9
Stockholders' equity    
Preferred stock, par value (in dollars per share) $ 0.2 $ 0.2
Preferred stock, shares authorized 20,000,000 20,000,000
Common stock, par value (in dollars per share) $ 0.2 $ 0.2
Common stock, shares authorized 750,000,000 750,000,000
Common stock, shares issued 248,502,000 250,469,000
Variable interest entity, primary beneficiary [Member]    
Assets of consolidated sponsored investment portfolios $ 1,894.0 $ 0.0
Liabilities of consolidated sponsored investment portfolios $ 63.2 $ 0.0