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Equity (Stock Repurchase Program) (Details) - USD ($)
$ / shares in Units, shares in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Aug. 04, 2016
Feb. 15, 2016
Dec. 31, 2015
Stock Repurchase Program          
Repurchase of common stock, authorized amount     $ 50,000,000.0 $ 50,000,000.0  
Treasury stock, shares, acquired 10.2 1.7      
Treasury stock value acquired including acquisition costs $ 98,400,000 $ 20,300,000      
Treasury stock acquired, average cost per share (in dollars per share) $ 9.67 $ 12.16      
Available repurchase of common stock, authorized amount (up to) $ 50,000,000       $ 48,700,000