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Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Millions
Sep. 30, 2015
Dec. 31, 2014
Consolidated Balance Sheets    
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred stock, shares authorized 0.1 0.1
Preferred stock, shares issued 0.0 0.0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 100.0 100.0
Common stock, shares issued 70.8 72.1
Common stock, shares outstanding 70.8 72.1