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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 100.0 100.0
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 500.0 500.0
Common stock, shares issued 191.5 190.9
Treasury stock, shares 36.1 31.6