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Shareholders' Equity
 12 Months Ended
Dec. 31, 2012
Equity [Abstract]  
Shareholders' Equity
Shareholders’ Equity
A class of 10 million shares of preferred stock, without par value, is authorized but unissued. Common stock has a par value of $1.66  2/3 per share; 600 million shares are authorized.
The following table summarizes the shares outstanding for the three years ended December 31, 2012:
 
Common
Stock
 
Treasury
Stock
 
Shares
Outstanding
Balance, Jan. 1, 2010
290,573,068

 
(124,905,409
)
 
165,667,659

Purchases
—

 
(8,124,621
)
 
(8,124,621
)
Issuances
—

 
2,838,777

 
2,838,777

Balance, Dec. 31, 2010
290,573,068

 
(130,191,253
)
 
160,381,815

Purchases
—

 
(10,236,694
)
 
(10,236,694
)
Issuances
—

 
1,743,659

 
1,743,659

Balance, Dec. 31, 2011
290,573,068

 
(138,684,288
)
 
151,888,780

Purchases
—

 
(1,000,000
)
 
(1,000,000
)
Issuances
—

 
2,677,517

 
2,677,517

Balance, Dec. 31, 2012
290,573,068

 
(137,006,771
)
 
153,566,297


 
Per share cash dividends paid were $2.34 in 2012, $2.26 in 2011 and $2.18 in 2010.