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Other Operating Credits and Charges, Net (Tables)
 3 Months Ended
Mar. 31, 2014
Other Operating Credits And Charges, Net [Abstract]  
Other Operating Credits and Charges Net [Table Text Block]
The major components of “Other operating credits and charges, net” in the Consolidated Statements of Income for the three months ended March 31, 2013 is reflected in the table below and is described in the paragraphs following the table:
 
Three Months Ended March 31,
Dollar amounts in millions
2014
 
2013
Other operating charges and credits net:
 
 
 
   Adjustment related to prior year inventory
$
—

 
$
(1.6
)
 
$
—

 
$
(1.6
)