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Receivables
 9 Months Ended
Sep. 30, 2012
Receivables [Abstract]  
Receivables
RECEIVABLES
Receivables consist of the following:
Dollar amounts in millions
September 30, 2012
 
December 31, 2011
Trade receivables
$
93.7

 
$
55.9

Interest receivables
3.7

 
1.2

Other receivables
8.4

 
9.1

Allowance of doubtful accounts
(1.2
)
 
(1.1
)
Total
$
104.6

 
$
65.1


Other receivables at September 30, 2012 and December 31, 2011 primarily consist of settlements, Canadian sales tax receivables, receivables from joint ventures and other items.