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Consolidated Condensed Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Common stock:    
Common stock, shares authorized 250.0 250.0
Common stock, par value $ 1 $ 1
Common stock , shares issued 104.0 104.1
Common stock share outstanding 94.0 93.5
Unvested restricted common stock included in shares issued and outstanding 0.2 0.5