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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes stock awards unit activity for the year ended December 31, 2012:
 
 
Weighted-average grant date share value
 
Shares
Outstanding units granted at the beginning of the year
$
31.75

 
2,891,298

Units granted
33.88

 
286,985

Units paid (in shares)
30.68

 
(499,085
)
Units canceled
32.10

 
(107,850
)
Outstanding units granted at the end of the year
32.19

 
2,571,348

 
 
 
 
Aggregate intrinsic value at year end of outstanding awards, in millions
 
 
$
86.0