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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Common stock, shares authorized 250 250
Common stock, par value $ 1 $ 1
Common stock, shares issued 104.0 104.1
Common stock, shares outstanding 92.1 93.5
Unvested restricted common stock included in shares issued and outstanding 0.2 0.4