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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Preferred stock, shares authorized 2.5 2.5
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, shares authorized 100.0 100.0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 39.9 39.3
Common stock, shares outstanding 39.9 39.3